coolant MERCEDES-BENZ SPRINTER 2006 Manual PDF

procedures, further details on wire harness routing
and retention, as well as pin-out and location views
for the various wire harness connectors, splices and
grounds.
The EMIC modules for this model are serviced only
as complete units. The EMIC module cannot be
adjusted or repaired. If a gauge, an LED indicator,
the multi-fuction indicator LCD unit, an electronic
tone generator, the electronic circuit board, the cir-
cuit board hardware, the cluster overlay, the cluster
housing, the cluster hood, the cluster lens, or the
cluster rear cover are damaged or faulty, the entire
EMIC module must be replaced.
OPERATION
The ElectroMechanical Instrument Cluster (EMIC)
is designed to allow the vehicle operator to monitor
the conditions of many of the vehicle components and
operating systems. The gauges, meters and indicators
in the EMIC provide valuable information about the
powertrain, fuel and emissions systems, cooling sys-
tem, lighting systems, safety systems and many
other convenience items. The EMIC is installed in
the instrument panel so that all of these monitors
can be easily viewed by the vehicle operator when
driving, while still allowing relative ease of access for
service. The microprocessor-based EMIC hardware
and software uses various inputs to control the
gauges and indicators visible on the face of the clus-
ter. Some of these inputs are hard wired, but many
are in the form of electronic messages that are trans-
mitted by other electronic modules over the Control-
ler Area Network (CAN) data bus network. (Refer to
8 - ELECTRICAL/ELECTRONIC CONTROL MOD-
ULES/COMMUNICATION - OPERATION).
The EMIC microprocessor smooths the input data
using algorithms to provide gauge readings that are
accurate, stable and responsive to operating condi-
tions. These algorithms are designed to provide
gauge readings during normal operation that are con-
sistent with customer expectations. However, when
abnormal conditions exist such as high coolant tem-
perature, the algorithm can drive the gauge pointer
to an extreme position and the microprocessor can
sound a chime through the on-board audible tone
generator to provide distinct visual and audible indi-
cations of a problem to the vehicle operator. The
instrument cluster circuitry also provides audible
turn signal and hazard warning support by emulat-
ing the ªtickingº sound associated with a conven-
tional electro-mechanical flasher using a contactless
relay. The relay will also provide an indication of a
turn signal failure by sounding at double the usual
frequency. Each audible warning is provided to the
vehicle operator to supplement a visual indication.
The EMIC circuitry operates on battery current
received through a non-switched fused B(+) circuit,
and on a fused ignition switch output circuit. TheEMIC circuitry is grounded through a ground circuit
and take out of the frame wire harness with an eye-
let terminal connector that is secured to a stud by a
nut at a ground location on the dash panel just for-
ward of the instrument cluster. Separate switched
ground inputs from the key-in ignition switch and
the front door jamb switches provide wake-up signals
to the EMIC circuitry. This arrangement allows the
EMIC to provide some features regardless of the igni-
tion switch position, while other features will operate
only with the ignition switch in the On position.
Proper diagnosis and testing of the EMIC, the
CAN data bus, the data bus electronic message
inputs to and outputs from the EMIC, as well as the
retrieval or erasure of a Diagnostic Trouble Code
(DTC) requires the use of a diagnostic scan tool.
Refer to the appropriate diagnostic information. See
the owner's manual in the vehicle glove box for more
information on the features, use and operation of the
EMIC.
GAUGES
All gauges receive battery current through the
EMIC circuitry only when the instrument cluster
detects the ignition switch is in the On position. With
the ignition switch in the Off position, battery cur-
rent is not supplied to any gauges and the EMIC cir-
cuitry is programmed to move all of the gauge
needles back to the low end of their respective scales.
Therefore, the gauges do not accurately indicate any
vehicle condition unless the ignition switch is in the
On position.
All of the EMIC gauges are air core magnetic
units. Two fixed electromagnetic coils are located
within each gauge. These coils are wrapped at right
angles to each other around a movable permanent
magnet. The movable magnet is suspended within
the coils on one end of a pivot shaft, while the gauge
needle is attached to the other end of the shaft. One
of the coils has a fixed current flowing through it to
maintain a constant magnetic field strength. Current
flow through the second coil changes, which causes
changes in its magnetic field strength. The current
flowing through the second coil is changed by the
EMIC circuitry in response to messages received over
the CAN data bus. The gauge needle moves as the
movable permanent magnet aligns itself to the
changing magnetic fields created around it by the
electromagnets.
Proper diagnosis and testing of the gauges, the
CAN data bus and the electronic data bus message
inputs to the EMIC that control each gauge require
the use of a diagnostic scan tool. Refer to the appro-
priate diagnostic information. Specific operation
details for each gauge may be found elsewhere in
this service information.
VAINSTRUMENT CLUSTER 8J - 5

INDICATORS
Indicators are located in various positions within
the EMIC and are all connected to the EMIC elec-
tronic circuit board. The ambient temperature indica-
tor (optional), brake indicator, brake wear indicator,
charging indicator, coolant low indicator, high beam
indicator, low fuel indicator, park brake indicator,
seatbelt indicator, turn signal indicators, and washer
fluid indicator operate based upon hard wired inputs
to the EMIC. The airbag (SRS) indicator is normally
controlled by a hard wired input from the Airbag
Control Module (ACM); however, if the EMIC sees an
abnormal or no input from the ACM, it will automat-
ically turn the airbag indicator On until the hard
wired input from the ACM has been restored. The
Malfunction Indicator Lamp (MIL) is normally con-
trolled by CAN data bus messages from the Engine
Control Module (ECM); however, if the EMIC loses
CAN data bus communication, the EMIC circuitry
will automatically turn the MIL on until CAN data
bus communication is restored. The EMIC uses CAN
data bus messages from the ECM, the ACM, and the
Controller Antilock Brake to control all of the
remaining indicators.
The various EMIC indicators are controlled by dif-
ferent strategies; some receive battery feed from the
EMIC circuitry and have a switched ground, while
others are grounded through the EMIC circuitry and
have a switched battery feed. However, all indicators
are completely controlled by the EMIC microproces-
sor based upon various hard wired and electronic
message inputs. Except for the indications provided
by the multi-function indicator Liquid Crystal Dis-
play (LCD) unit, all indicators are illuminated at a
fixed intensity, which is not affected by the selected
illumination intensity of the EMIC general illumina-
tion lamps.
The hard wired indicator inputs may be diagnosed
using conventional diagnostic methods. However,
proper testing of the EMIC circuitry and the CAN
bus message controlled indicators requires the use of
a diagnostic scan tool. Refer to the appropriate diag-
nostic information. Specific details of the operation
for each indicator may be found elsewhere in this
service information.
CLUSTER ILLUMINATION
The EMIC has several general illumination lamps
that are illuminated when the exterior lighting is
turned on with the multi-function switch. The illumi-
nation intensity of these lamps is adjusted by a dim-
ming level input received from the multi-function
indicator ª+º (plus) and ª±º (minus) switch push but-
tons that extend through the lower edge of the clus-
ter lens below the right end of the multi-function
indicator. When the exterior lighting is turned Off,
the display is illuminated at maximum brightness.
When the exterior lighting is turned On and thetransmission gear selector is in the Park position,
depressing the plus switch push button brightens the
display lighting, and depressing the minus switch
push button dims the display lighting. The EMIC
also provides a Pulse-Width Modulated (PWM) panel
lamps dimmer output that can be used to synchro-
nize the illumination lighting levels of external illu-
mination lamps (up to about 23 to 30 watts) with
that of the EMIC.
The hard wired multi-function switch input and
the EMIC panel lamps dimmer output may be diag-
nosed using conventional diagnostic methods. How-
ever, proper testing of the PWM control of the EMIC
and the electronic dimming level inputs from the
multi-function indicator push buttons requires the
use of a diagnostic scan tool. Refer to the appropriate
diagnostic information.
INPUT AND OUTPUT CIRCUITS
HARD WIRED INPUTS
The hard wired inputs to the EMIC include the fol-
lowing:
NOTE: Final approved circuit names were not yet
available at the time this information was compiled.
²Airbag Indicator Driver
²Ambient Temperature Sensor Signal
(Optional)
²Brake Wear Indicator Sense
²Charging Indicator Driver
²Coolant Level Switch Sense
²Front Door Jamb Switch Sense
²Fuel Level Sensor Signal
²Fused B(+)
²Fused Ignition Switch Output
²High Beam Indicator Driver
²Key-In Ignition Switch Sense
²Left Turn Signal
²Park Brake Switch Sense
²Right Turn Signal
²Seat Belt Switch Sense
²Washer Fluid Switch Sense (Optional)
Refer to the appropriate wiring information for
additional details.
HARD WIRED OUTPUTS
The hard wired outputs of the EMIC include the
following:
²Engine Running Relay Control
²Panel Lamps Driver
Refer to the appropriate wiring information for
additional details.
8J - 6 INSTRUMENT CLUSTERVA

clock remains functional regardless of the ignition
switch position.
The vehicle operator can choose to have the
optional ambient temperature indicator displayed
instead of the clock information, but the clock and
ambient temperature indicator cannot be displayed
at the same time. The clock or ambient temperature
indicator display option is selected using the multi-
function indicator clock switch on the instrument
cluster circuit board. This switch is actuated manu-
ally by depressing the clock switch push button that
extends through the lower edge of the cluster lens
below the left end of the multi-function indicator.
Actuating this switch momentarily will toggle the
display between the clock and ambient temperature
indicator modes. Actuating this switch twice within
about one second will cause the display to toggle, but
then automatically revert to the originally selected
mode after about twenty seconds.
See the owner's manual in the vehicle glove box for
more information on the features, use, operation and
setting procedures for the clock. For proper testing of
the instrument cluster circuitry that controls the
clock functions, a diagnostic scan tool is required.
Refer to the appropriate diagnostic information.
COOLANT LOW INDICATOR
DESCRIPTION
A coolant low indicator is standard equipment on
all instrument clusters. The coolant low indicator is
located near the lower edge of the instrument cluster,
to the left of the multi-function indicator display. The
coolant low indicator consists of the International
Control and Display Symbol icon for ªLow Engine
Coolantº imprinted within a rectangular cutout in
the opaque layer of the instrument cluster overlay.
The dark outer layer of the overlay prevents the indi-
cator from being clearly visible when it is not illumi-
nated. A red Light Emitting Diode (LED) behind the
cutout in the opaque layer of the overlay causes the
icon to appear silhouetted against a red field through
the translucent outer layer of the overlay when the
indicator is illuminated from behind by the LED,
which is soldered onto the instrument cluster elec-
tronic circuit board. The coolant low indicator is ser-
viced as a unit with the instrument cluster.
OPERATION
The coolant low indicator gives an indication to the
vehicle operator when the engine coolant level is low.
This indicator is controlled by a transistor on the
instrument cluster circuit board based upon cluster
programming and a hard wired input received by the
cluster from the engine coolant level switch. The cool-
ant low indicator Light Emitting Diode (LED) is com-
pletely controlled by the instrument cluster logiccircuit, and that logic will only allow this indicator to
operate when the instrument cluster detects that the
ignition switch is in the On position. Therefore, the
LED will always be off when the ignition switch is in
any position except On. The LED only illuminates
when it is provided a path to ground by the instru-
ment cluster transistor. The instrument cluster will
turn on the coolant low indicator for the following
reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the coolant low indicator is
illuminated for about two seconds as a bulb test.
²Engine Coolant Level Switch Input- Each
time the cluster detects an appropriate input on the
low coolant fluid level sense circuit (engine coolant
level switch resistance low = engine coolant level low)
while the ignition switch is in the On position, the
coolant low indicator will be illuminated. The indica-
tor remains illuminated until the low coolant fluid
level sense input to the cluster changes (engine cool-
ant level switch resistance high = engine coolant
level full), or until the ignition switch is turned to
the Off position, whichever occurs first. The engine
coolant level switch also features a diagnostic resis-
tor connected in parallel between the switch input
and output to provide the cluster with verification
that the low coolant fluid level sense circuit is not
open or shorted.
The engine coolant level switch integral to the cool-
ant bottle provides a hard wired input to the instru-
ment cluster circuitry through the low coolant fluid
level sense circuit. The engine coolant level switch
and the low coolant fluid level sense circuit to the
instrument cluster can be diagnosed using conven-
tional diagnostic tools and methods. For proper diag-
nosis of the instrument cluster circuitry that controls
the coolant low indicator, a diagnostic scan tool is
required. Refer to the appropriate diagnostic infor-
mation.
ENGINE TEMPERATURE
GAUGE
DESCRIPTION
An engine coolant temperature gauge is standard
equipment on all instrument clusters. The engine
coolant temperature gauge is located in the upper
right corner of the instrument cluster, to the right of
the speedometer. The engine coolant temperature
gauge consists of a movable gauge needle or pointer
controlled by the instrument cluster circuitry and a
fixed 45 degree scale on the cluster overlay that
reads left-to-right from 120É C to 40É C for Canadian
vehicles, or from 250É F to 110É F for United States
vehicles. An International Control and Display Sym-
bol icon for ªEngine Coolant Temperatureº is located
VAINSTRUMENT CLUSTER 8J - 15

on the cluster overlay, directly below the high end of
the scale. Just to the right of the icon, the nomencla-
ture ªÉCº or ªÉFº confirms the unit of measure for the
gauge readings.
The engine coolant temperature gauge graphics are
white against a black field, except for a single red
graduation at the far left (high) end of the gauge
scale, making them clearly visible within the instru-
ment cluster in daylight. When illuminated from
behind by the panel lamps dimmer controlled cluster
illumination lighting with the exterior lamps turned
On, the white graphics appear amber and the red
graphics appear red. The orange gauge needle is
internally illuminated. Gauge illumination is pro-
vided by Light Emitting Diode (LED) units soldered
onto the instrument cluster electronic circuit board.
The engine coolant temperature gauge is serviced as
a unit with the instrument cluster.
OPERATION
The engine coolant temperature gauge gives an
indication to the vehicle operator of the engine cool-
ant temperature. This gauge is controlled by the
instrument cluster circuit board based upon cluster
programming and electronic messages received by
the cluster from the Engine Control Module (ECM)
over the Controller Area Network (CAN) data bus.
The engine coolant temperature gauge is an air core
magnetic unit that receives battery current on the
instrument cluster electronic circuit board when the
instrument cluster detects that the ignition switch is
in the On position. The cluster is programmed to
move the gauge needle back to the low end of the
scale after the ignition switch is turned to the Off
position. The instrument cluster circuitry controls
the gauge needle position and provides the following
features:
²Engine Temperature Normal Message- Each
time the cluster receives a message from the ECM
indicating the engine coolant temperature is within
the normal operating range [up to about 120É C (250É
F), the gauge needle is moved to the actual relative
temperature position on the gauge scale.
²Engine Temperature High Message- Each
time the cluster receives a message from the ECM
indicating the engine coolant temperature is high
[above about 120É C (250É F) the gauge needle is
moved into the red warning zone on the gauge scale.
The ECM continually monitors the engine coolant
temperature sensor to determine the engine operat-
ing temperature. The ECM then sends the proper
engine coolant temperature messages to the instru-
ment cluster. If the instrument cluster moves the
engine coolant temperature gauge needle to red area
of the gauge scale, it may indicate that the engine or
the engine cooling system require service. For proper
diagnosis of the engine coolant temperature sensor,
the ECM, the CAN data bus, the electronic messageinputs to the instrument cluster, or the instrument
cluster circuitry that controls the engine coolant tem-
perature gauge, a diagnostic scan tool is required.
Refer to the appropriate diagnostic information.
ESP INDICATOR
DESCRIPTION
An Electronic Stability Program (ESP) indicator is
standard equipment on all instrument clusters, but is
only functional on vehicles equipped with the
optional ESP system. The ESP indicator is located
near the lower edge of the instrument cluster, to the
right of the multi-function indicator display. The ESP
indicator consists of a stencil-like cutout of the text
ªESPº in the opaque layer of the instrument cluster
overlay. The dark outer layer of the overlay prevents
the indicator from being clearly visible when it is not
illuminated. An amber Light Emitting Diode (LED)
behind the cutout in the opaque layer of the overlay
causes the text to appear in amber through the
translucent outer layer of the overlay when the indi-
cator is illuminated from behind by the LED, which
is soldered onto the instrument cluster electronic cir-
cuit board. The ESP indicator is serviced as a unit
with the instrument cluster.
OPERATION
The ESP indicator gives an indication to the vehi-
cle operator when the ESP system is faulty or inop-
erative. This indicator is controlled by a transistor on
the instrument cluster circuit board based upon clus-
ter programming and electronic messages received by
the cluster from the Controller Antilock Brake (CAB)
over the Controller Area Network (CAN) data bus.
The ESP indicator Light Emitting Diode (LED) is
completely controlled by the instrument cluster logic
circuit, and that logic will only allow this indicator to
operate when the instrument cluster detects that the
ignition switch is in the On position. Therefore, the
LED will always be off when the ignition switch is in
any position except On. The LED only illuminates
when it is provided a path to ground by the instru-
ment cluster transistor. The instrument cluster will
turn on the ESP indicator for the following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the ESP indicator is illu-
minated by the cluster for about two seconds as a
bulb test.
²ESP Lamp-On Message- Each time the clus-
ter receives a lamp-on message from the CAB, the
ESP indicator will be illuminated. The indicator
remains illuminated until the cluster receives a
lamp-off message from the CAB, or until the ignition
switch is turned to the Off position, whichever occurs
first.
8J - 16 INSTRUMENT CLUSTERVA

next required engine oil maintenance is anticipated.
ASSYST also provides several audible indications
using the electronic tone generator on the instrument
cluster circuit board to supplement these visual dis-
plays.
The indications of the ASSYST engine oil mainte-
nance indicator are not visible when the LCD is not
illuminated. When illuminated, the ASSYST indica-
tions appear as dark characters and icons silhouetted
against an amber field. When the exterior lighting is
turned Off, the display is illuminated at maximum
brightness. When the exterior lighting is turned On,
the display illumination level can be adjusted in con-
cert with the cluster general illumination lighting
using the ª+º (plus) and ª2º (minus) multi-function
indicator push buttons. The ASSYST engine oil main-
tenance indicator is serviced as a unit with the
instrument cluster.
OPERATION
The ASSYST engine oil maintenance indicator
microprocessor uses numerous criteria besides time
and mileage to evaluate vehicle maintenance require-
ments. Time data is taken from the electronic digital
clock integral to the instrument cluster. Vehicle dis-
tance data is obtained from the Controller Antilock
Brake (CAB) over the Controller Area Network
(CAN) data bus. Coolant temperature, engine oil
temperature, engine oil level, engine oil quality,
engine speed, and engine load data are obtained from
the Engine Control Module (ECM) over the CAN
data bus. Using all of the available data and internal
programming, the ASSYST microprocessor then cal-
culates the estimated time and distance to the next
required engine oil maintenance interval. The
ASSYST uses the multi-function indicator LCD to
display that data and, when necessary, issues audible
alerts to the vehicle operator through the electronic
tone generator on the cluster circuit board.
See the owner's manual in the vehicle glove box for
more information on the features, use, operation and
resetting procedures for the ASSYST maintenance
computer. Proper diagnosis and testing of the
ASSYST engine oil maintenance computer, the CAN
data bus and the electronic data bus message inputs
to the EMIC that are used by the ASSYST computer
for its calculations requires the use of a diagnostic
scan tool. Refer to the appropriate diagnostic infor-
mation.
MALFUNCTION INDICATOR
LAMP (MIL)
DESCRIPTION
A Malfunction Indicator Lamp (MIL) is standard
equipment on all instrument clusters. The MIL islocated near the lower edge of the instrument cluster,
to the right of the multi-function indicator display.
The MIL consists of the International Control and
Display Symbol icon for ªEngineº imprinted within a
rectangular cutout in the opaque layer of the instru-
ment cluster overlay. The dark outer layer of the
overlay prevents the indicator from being clearly vis-
ible when it is not illuminated. An amber Light
Emitting Diode (LED) behind the cutout in the
opaque layer of the overlay causes the icon to appear
silhouetted against an amber field through the trans-
lucent outer layer of the overlay when the indicator
is illuminated from behind by the LED, which is sol-
dered onto the instrument cluster electronic circuit
board. The MIL is serviced as a unit with the instru-
ment cluster.
OPERATION
The Malfunction Indicator Lamp (MIL) gives an
indication to the vehicle operator when the Engine
Control Module (ECM) has recorded a Diagnostic
Trouble Code (DTC) for an On-Board Diagnostics II
(OBDII) emissions-related circuit or component mal-
function. The MIL is controlled by a transistor on the
instrument cluster circuit board based upon cluster
programming and electronic messages received by
the cluster from the ECM over the Controller Area
Network (CAN) data bus. The MIL Light Emitting
Diode (LED) is completely controlled by the instru-
ment cluster logic circuit, and that logic will only
allow this indicator to operate when the instrument
cluster detects that the ignition switch is in the On
position. Therefore, the LED will always be off when
the ignition switch is in any position except On. The
LED only illuminates when it is provided a path to
ground by the instrument cluster transistor. The
instrument cluster will turn on the MIL for the fol-
lowing reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the MIL is illuminated as a
bulb test. The indicator will remain illuminated until
the engine is started, or until the ignition switch is
turned to the Off position, whichever occurs first.
²MIL Lamp-On Message- Each time the clus-
ter receives a MIL lamp-on message from the ECM,
the indicator will be illuminated. The indicator will
remain illuminated until the detected fault is
repaired, or until the ignition switch is turned to the
Off position, whichever occurs first. For more infor-
mation on the ECM and the DTC set and reset
parameters, (Refer to 25 - EMISSIONS CONTROL -
OPERATION).
²Communication Error- If the cluster receives
no lamp-on or lamp-off message from the ECM, the
MIL is illuminated by the instrument cluster. The
indicator remains controlled and illuminated by the
cluster until a valid lamp-on or lamp-off message is
received from the ECM.
VAINSTRUMENT CLUSTER 8J - 21

The ECM continually monitors the engine coolant
temperature sensor to determine when the glow
plugs need to be energized in their pre-heat operat-
ing mode. The ECM then sends the proper wait-to-
start lamp-on and lamp-off messages to the
instrument cluster. If the instrument cluster turns on
the indicator after the engine is started, it may indi-
cate that a malfunction has occurred and that the
engine glow control system requires service. The
ECM will store a Diagnostic Trouble Code (DTC) for
any malfunction it detects. For proper diagnosis of
the engine coolant temperature sensor, the engine
glow control system and circuits, the ECM, the CAN
data bus, or the electronic message inputs to the
instrument cluster that control the wait-to-start indi-
cator, a diagnostic scan tool is required. Refer to the
appropriate diagnostic information.
WASHER FLUID INDICATOR
DESCRIPTION
A washer fluid indicator is standard equipment on
all instrument clusters. However, this indicator is
only functional on vehicles equipped with an optional
washer fluid level switch integral to the washer
pump/motor unit on the washer reservoir. The
washer fluid indicator is located near the lower edge
of the instrument cluster, to the right of the multi-
function indicator display. The washer fluid indicator
consists of the International Control and Display
Symbol icon for ªWindshield Washer Fluidº imprinted
within a rectangular cutout in the opaque layer of
the instrument cluster overlay. The dark outer layer
of the overlay prevents the indicator from being
clearly visible when it is not illuminated. An amber
Light Emitting Diode (LED) behind the cutout in the
opaque layer of the overlay causes the icon to appear
silhouetted against an amber field through the trans-
lucent outer layer of the overlay when the indicator
is illuminated from behind by the LED, which is sol-
dered onto the instrument cluster electronic circuit
board. The washer fluid indicator is serviced as a
unit with the instrument cluster.
OPERATION
The washer fluid indicator gives an indication to
the vehicle operator that the fluid level in the washer
reservoir is low. This indicator is controlled by the
instrument cluster circuit board based upon cluster
programming and a hard wired input from the
optional washer fluid level switch that is integral to
the washer pump/motor unit. The washer fluid indi-
cator is completely controlled by the instrument clus-
ter logic circuit, and that logic will only allow this
indicator to operate when the instrument cluster
detects that the ignition switch is in the On position.
Therefore, the indicator will always be off when theignition switch is in any position except On. The indi-
cator only illuminates when it is switched to ground
by the instrument cluster circuitry. The instrument
cluster will turn on the washer fluid indicator for the
following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the brake wear indicator is
illuminated by the instrument cluster for about two
seconds as a bulb test.
²Washer Fluid Level Switch Input- Each time
the cluster detects ground on the washer fluid switch
sense circuit (washer fluid level switch closed =
washer fluid level low) while the ignition switch is in
the On position, the washer fluid indicator is illumi-
nated. The indicator remains illuminated until the
washer fluid level switch input to the cluster is an
open circuit (washer fluid level switch open = washer
fluid level acceptable), or until the ignition switch is
turned to the Off position, whichever occurs first.
The instrument cluster continually monitors the
washer fluid level switch to determine the level of
the washer fluid. The instrument cluster logic applies
a delay strategy to this input to reduce the negative
effect that fluid sloshing within the reservoir can
have on reliable indicator operation. The washer
fluid level switch and circuit can be diagnosed using
conventional diagnostic tools and methods. For
proper diagnosis of the instrument cluster circuitry
that controls the washer fluid indicator, a diagnostic
scan tool is required. Refer to the appropriate diag-
nostic information.
WATER - IN - FUEL INDICATOR
DESCRIPTION
A water-in-fuel indicator is standard equipment in
all instrument clusters. The water-in-fuel indicator is
located near the lower edge of the instrument cluster,
to the left of the multi-function indicator display. The
water-in-fuel indicator consists of the International
Control and Display Symbol icon for ªWater In Fuelº
imprinted within a rectangular cutout in the opaque
layer of the instrument cluster overlay. The dark
outer layer of the overlay prevents the indicator from
being clearly visible when it is not illuminated. An
amber Light Emitting Diode (LED) behind the cutout
in the opaque layer of the overlay causes the icon to
appear silhouetted against an amber field through
the translucent outer layer of the overlay when the
indicator is illuminated from behind by the LED,
which is soldered onto the instrument cluster elec-
tronic circuit board. The water-in-fuel indicator is
serviced as a unit with the instrument cluster.
OPERATION
The water-in-fuel indicator gives an indication to
the vehicle operator when there is excessive water
VAINSTRUMENT CLUSTER 8J - 29

8W-02 COMPONENT INDEX
Component Page
A/C Auxiliary Fan..................... 8W-42
A/C Auxiliary Fan Relay................ 8W-42
A/C Compressor Clutch................. 8W-42
A/C Compressor Clutch Relay............ 8W-42
A/C Roof Auxiliary Fan................. 8W-42
A/C Roof Auxiliary Fan Relay............ 8W-42
Accelerator Pedal Position Sensor......... 8W-30
Additional Heat Exchanger.............. 8W-42
Additional Heat Exchanger Relay......... 8W-42
Additional Heat Exchanger Switch........ 8W-42
Air Outlet Temperature Sensor........... 8W-42
Airbag Control Module................. 8W-43
Airbag Squibs........................ 8W-43
Ambient Temperature Sensor............ 8W-42
Anti Icing Switch..................... 8W-42
Ash Receiver Lamp.................... 8W-44
Automatic Temperature Control Module.... 8W-42
Auxiliary Heater Control................ 8W-42
Battery............................. 8W-20
Battery Relay-Auxiliary................ 8W-20
Battery-Auxiliary..................... 8W-20
Beam Select Switch.................... 8W-50
Blower Motor Resistor Block............. 8W-42
Blower Motor-Front.................... 8W-42
Blower Stage I Diode................... 8W-42
Body Plug Connector................... 8W-11
Boost Pressure Sensor.................. 8W-30
Boost Pressure Servomotor.............. 8W-30
Boost Pressure Solenoid................ 8W-30
Brake Fluid Level Switch............... 8W-35
Brake Lamp Switch.................... 8W-35
Brake Lamp Switch 4 Pole.............. 8W-35
Brake Pressure Sensor................. 8W-35
Brake Wear Sensors................... 8W-35
CTEL Antenna Connector............... 8W-55
CTEL Connector...................... 8W-55
Cabin Heater Assembly................. 8W-42
Cabin Heater Module.................. 8W-42
Camshaft Position Sensor............... 8W-30
Center High Mounted Stop Lamp......... 8W-51
Central Timer Module.................. 8W-45
Cigar Lighter......................... 8W-41
Cigar Lighter Lamp................... 8W-44
Circulation Pump..................... 8W-42
Circulation Pump Diode................ 8W-42
Circulation Pump Relay-Cabin Heater
Module........................... 8W-42
Clockspring....................... 8W-41, 43
Controller Antilock Brake............... 8W-35
Courtesy Lamps...................... 8W-44
Crankcase Heater..................... 8W-30
Crankshaft Position Sensor.............. 8W-30Component Page
Cylinder Lock Switch-Driver............. 8W-61
D+ Relays........................ 8W-10, 11
Data Link Connector................... 8W-18
Daytime Running Lamp Relays........... 8W-50
Differential Lock Solenoid Valve.......... 8W-31
Dome Lamp.......................... 8W-44
Door Jamb Switch-Rear................. 8W-61
Door Jamb Switches................... 8W-44
Door Jamb Switches-Sliding............. 8W-61
Door Lock Motor/Ajar Switch Assemblies . . . 8W-61
Dosing Pump......................... 8W-42
EGR Valve........................... 8W-30
Electrohydraulic Control Unit............ 8W-31
Engine Control Module................. 8W-30
Engine Control Relay.................. 8W-31
Engine Coolant Level Switch............. 8W-30
Engine Coolant Temperature Sensor....... 8W-30
Engine Oil Sensor..................... 8W-30
Evaporator Temperature Sensor.......... 8W-42
Fan Stage 1 Relay..................... 8W-42
Fog Lamp Relay...................... 8W-50
Fog Lamp Switch..................... 8W-50
Fuel Injectors........................ 8W-30
Fuel Level Sensor..................... 8W-30
Fuel Pressure Sensor.................. 8W-30
Fuel Pressure Solenoid................. 8W-30
Fuel Pump........................... 8W-30
Fuel Pump Relay...................... 8W-30
Fuel Quantity Control Valve............. 8W-30
Fuel Shutdown Solenoid................ 8W-30
Fuel Temperature Sensor............... 8W-30
Fuse Blocks.................... 8W-10, 11, 30
Fuse/Relay Block...................... 8W-11
Fused Ignition Switch Run-Start Relay..... 8W-11
Fuses......................... 8W-10, 11, 42
Generator........................... 8W-20
Glow Plug Control Module.............. 8W-30
Glow Plugs.......................... 8W-30
Grounds............................ 8W-15
Hazard Warning Switch................ 8W-52
Headlamp Adjust Switch................ 8W-50
Headlamp Assemblies............... 8W-50, 52
Headlamp Switch..................... 8W-50
Heated Seat Modules.................. 8W-63
Heated Seat Switches.................. 8W-63
Heater Timer-Auxiliary................. 8W-42
High Idle Switch...................... 8W-30
High Pressure Switch.................. 8W-42
Hood Ajar Switch..................... 8W-39
Horn............................... 8W-41
Horn Relay.......................... 8W-41
Horn Switch......................... 8W-41
VA8W-02 COMPONENT INDEX 8W - 02 - 1

8W-15 GROUND DISTRIBUTION
Component PageA/C Auxiliary Fan..........................8W-15-4
A/C Auxiliary Fan Relay......................8W-15-12
A/C Compressor Clutch Relay...................8W-15-30
A/C Roof Auxiliary Fan......................8W-15-30
A/C Roof Auxiliary Fan Relay...................8W-15-30
Additional Heat Exchanger....................8W-15-12
Additional Heat Exchanger Relay.................8W-15-12
Additional Heat Exchanger Switch................8W-15-24
Airbag Control Module.......................8W-15-11
Ash Receiver Lamp........................8W-15-22
Automatic Temperature Control Module.............8W-15-24
Auxiliary Heater Control.....................8W-15-24
Battery................................8W-15-8
Battery Relay-Auxiliary......................8W-15-11
Battery-Auxiliary..........................8W-15-11
Blower Motor-Front.........................8W-15-9
Brake Fluid Level Switch......................8W-15-8
Brake Wear Sensor-Left Front...................8W-15-8
Brake Wear Sensor-Left Rear...................8W-15-28
Brake Wear Sensor-Right Front..................8W-15-8
Brake Wear Sensor-Right Rear..................8W-15-28
CTEL Connector..........................8W-15-21
Cabin Heater Module........................8W-15-3
Center High Mounted Stop Lamp.................8W-15-6
Central Timer Module.......................8W-15-15
Cigar Lighter............................8W-15-22
Cigar Lighter Lamp........................8W-15-22
Circulation Pump..........................8W-15-9
Circulation Pump Relay-Cabin Heater Module..........8W-15-12
Clockspring.............................8W-15-10
Controller Antilock Brake....................8W-15-2, 28
Crankcase Heater..........................8W-15-4
Cylinder Lock Switch-Driver...................8W-15-10
D+ Relay No. 1...........................8W-15-12
D+ Relay No. 2...........................8W-15-14
Data Link Connector........................8W-15-10
Daytime Running Lamp Relay-Left Side.............8W-15-13
Daytime Running Lamp Relay-Right Side............8W-15-13
Daytime Running Lamps Relay..................8W-15-13
Differential Lock Solenoid Valve..................8W-15-2
Dome Lamp.............................8W-15-6
Dosing Pump............................8W-15-2
Engine Control Module.......................8W-15-7
Engine Coolant Level Switch....................8W-15-2
Fan Stage 1 Relay.........................8W-15-11
Fog Lamp Relay..........................8W-15-11
Fog Lamp Switch.........................8W-15-22
Fuel Pump.............................8W-15-19
Fuse Block No. 1..........................8W-15-7
Fused Ignition Switch Run-Start Relay..............8W-15-14
G100...............................8W-15-2, 3
G101.................................8W-15-4
G102.................................8W-15-4
G103.................................8W-15-4
G200...........................8W-15-6, 7, 8, 9, 10
G201................................8W-15-11
G202................8W-15-11, 12, 13, 14, 15, 16, 17, 18, 19
G203......................8W-15-20, 21, 22, 23, 24, 25
G300............................8W-15-26, 27, 28
G301................................8W-15-28
G302................................8W-15-28
G303................................8W-15-31
G304................................8W-15-31
G305..............................8W-15-29, 30
Glow Plug Control Module.....................8W-15-2
Hazard Warning Switch.......................8W-15-7
Headlamp Adjust Switch.....................8W-15-22
Headlamp Assembly-Left......................8W-15-3
Headlamp Assembly-Right.....................8W-15-4
Heated Seat Module-Driver....................8W-15-19
Heated Seat Module-Passenger..................8W-15-19
Heated Seat Switch-Driver....................8W-15-25
Heated Seat Switch-Passenger..................8W-15-25
Heater Timer-Auxiliary......................8W-15-24
High Idle Switch..........................8W-15-25
Hood Ajar Switch..........................8W-15-4
Horn Relay.............................8W-15-11
Horn Switch............................8W-15-10
Ignition Lock Switch........................8W-15-10
Instrument Cluster........................8W-15-10
Instrument Panel Socket.....................8W-15-20
Interior Lamp No. 1.........................8W-15-6
Interior Lamp No. 2.........................8W-15-6
Interior Lamp No. 3.........................8W-15-6Component PageInterior Lamp No. 4.........................8W-15-6
Interior Lamp No. 5.........................8W-15-6
Interior Lamp-Left.........................8W-15-6
Interior Lamp-Middle Front...................8W-15-5, 6
Interior Lamp-Middle Rear...................8W-15-5, 6
Interior Lamp-Rear No. 2......................8W-15-5
Interior Lamp-Right.......................8W-15-5, 6
Interior Light Switch.......................8W-15-21
Interior Lighting Connector.....................8W-15-6
Intrusion Sensor No. 1.......................8W-15-6
Intrusion Sensor No. 2.......................8W-15-6
Intrusion Sensor No. 3.......................8W-15-6
Kickdown Switch..........................8W-15-8
Lamp Relay-Left..........................8W-15-13
Lamp Relay-Right.........................8W-15-13
License Plate Lamp No. 1.....................8W-15-27
License Plate Lamp No. 2.....................8W-15-27
Locker Switch No. 1........................8W-15-20
Map/Reading Lamp Switch....................8W-15-21
Marker Lamp Connector......................8W-15-17
Marker Lamp No. 1-Left Front..................8W-15-16
Marker Lamp No. 1-Right Front.................8W-15-16
Marker Lamp No. 2-Left Front..................8W-15-16
Marker Lamp No. 2-Right Front.................8W-15-16
Marker Lamp-Left Center.....................8W-15-17
Marker Lamp-Left Rear......................8W-15-27
Marker Lamp-Right Center....................8W-15-17
Marker Lamp-Right Rear.....................8W-15-27
Master Door Lock Switch.....................8W-15-25
Metering Pump...........................8W-15-18
Multi-Function Switch.......................8W-15-7
Optional Equipment Relay....................8W-15-19
Panic Alarm Switch........................8W-15-20
Parking Brake Switch.......................8W-15-15
Power Mirror Motor-Driver....................8W-15-23
Power Mirror Motor-Passenger..................8W-15-23
Power Mirror Switch........................8W-15-23
Power Window Switch-Driver...................8W-15-23
Power Window Switch-Master...................8W-15-23
Radio................................8W-15-21
Rain Sensor............................8W-15-31
Rain Sensor Control Module..................8W-15-19, 31
Reading Lamp Connector......................8W-15-6
Rear Window Defogger Relay...................8W-15-14
Recirculated Air Solenoid Valve...................8W-15-9
Rollover Switch Assembly......................8W-15-3
Roof A/C Blower..........................8W-15-29
Roof A/C Blower Stage I And Ii Relay...............8W-15-29
Roof A/C Blower Stage I Relay..................8W-15-29
Roof A/C Blower Stage Ii Relay..................8W-15-29
Roof A/C Control Module.....................8W-15-28
Roof A/C Switch..........................8W-15-24
Roof Fan Switch..........................8W-15-21
Roof Thermotronic Control Module................8W-15-30
Seat Belt Switch..........................8W-15-15
Security System Module......................8W-15-15
Sentry Key Remote Entry Module.................8W-15-7
Shifter Assembly..........................8W-15-20
Siren.................................8W-15-9
Steering Angle Sensor........................8W-15-7
TCS Switch.............................8W-15-25
Tail Lamp Assembly-Left.....................8W-15-26
Tail Lamp Assembly-Right.....................8W-15-26
Thermotronic Diode........................8W-15-30
Time Delay Relay.........................8W-15-17
Towing/Intrusion Sensor On/Off Switch..............8W-15-22
Trailer Tow Connector.......................8W-15-28
Trailer Tow Control Module....................8W-15-19
Transmission Control Module...................8W-15-19
Transmission Relay........................8W-15-19
Turn Signal No. 1-Left Front....................8W-15-3
Turn Signal No. 1-Right Front...................8W-15-4
Turn Signal No. 2-Left Front....................8W-15-3
Turn Signal No. 2-Right Front...................8W-15-4
Warm Air Auxiliary Heater Assembly...............8W-15-18
Washer Pump Motor-Front.....................8W-15-4
Water Cycle Valve..........................8W-15-9
Window Defogger Module-Rear..................8W-15-15
Window Defogger Switch-Rear..................8W-15-20
Window Defogger-Left Rear....................8W-15-26
Window Defogger-Right Rear...................8W-15-26
Wiper Motor-Front.........................8W-15-9
Wiper/Turn Signal/Engine Start Control Module.........8W-15-7
VA8W-15 GROUND DISTRIBUTION 8W - 15 - 1

8W-30 FUEL/IGNITION SYSTEM
Component Page
Accelerator Pedal Position Sensor.... 8W-30-10, 21
Airbag Control Module................ 8W-30-9
Boost Pressure Sensor............. 8W-30-9, 25
Boost Pressure Servomotor............ 8W-30-24
Boost Pressure Solenoid.............. 8W-30-14
Camshaft Position Sensor.............. 8W-30-6
Central Timer Module................ 8W-30-9
Crankcase Heater................ 8W-30-17, 24
Crankshaft Position Sensor............ 8W-30-7
Data Link Connector................. 8W-30-4
Daytime Running Lamps Relay......... 8W-30-2
EGR Valve..................... 8W-30-17, 24
Engine Control Module . . . 8W-30-2, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17,
18, 19, 20, 21, 22, 23, 24, 25
Engine Control Relay........... 8W-30-8, 17, 24
Engine Coolant Level Switch........... 8W-30-3
Engine Coolant Temperature Sensor..... 8W-30-6
Engine Oil Sensor................... 8W-30-17
Fuel Injector No. 1............... 8W-30-15, 22
Fuel Injector No. 2............... 8W-30-16, 23
Fuel Injector No. 3............... 8W-30-15, 22
Fuel Injector No. 4............... 8W-30-15, 22
Fuel Injector No. 5............... 8W-30-16, 23
Fuel Level Sensor.................... 8W-30-3
Fuel Pressure Sensor................. 8W-30-5
Fuel Pressure Solenoid................ 8W-30-7
Fuel Pump........................ 8W-30-18
Fuel Pump Relay................... 8W-30-18
Fuel Quantity Control Valve........... 8W-30-7
Fuel Shutdown Solenoid............... 8W-30-7
Fuel Temperature Sensor.............. 8W-30-5
Fuse 5......................... 8W-30-13, 19
Fuse 7............................ 8W-30-20
Fuse 12............................ 8W-30-2Component Page
Fuse 16............................ 8W-30-8
Fuse 17........................ 8W-30-17, 24
Fuse 18............................ 8W-30-9
Fuse 19........................... 8W-30-18
Fuse Block No. 1....... 8W-30-8, 9, 17, 18, 20, 24
Fuse Block No. 3.................... 8W-30-2
G100........................ 8W-30-3, 13, 19
G103............................. 8W-30-17
G200........................... 8W-30-8, 12
G202............................. 8W-30-18
G203.............................. 8W-30-2
Glow Plug Control Module......... 8W-30-13, 19
Glow Plug No. 1................. 8W-30-13, 19
Glow Plug No. 2................. 8W-30-13, 19
Glow Plug No. 3................. 8W-30-13, 19
Glow Plug No. 4................. 8W-30-13, 19
Glow Plug No. 5................. 8W-30-13, 19
High Idle Switch.................... 8W-30-2
Instrument Cluster................... 8W-30-3
Intake Air Pressure Sensor............ 8W-30-20
Intake Air Temperature Sensor...... 8W-30-10, 21
Kickdown Switch................... 8W-30-12
Low Fuel Pressure Sensor............ 8W-30-11
Mass Air Flow Sensor............. 8W-30-14, 20
Optional Equipment Relay............. 8W-30-2
Oxygen Sensor..................... 8W-30-24
Power Distribution Center......... 8W-30-13, 19
Relay Block........................ 8W-30-2
Speed Control Switch................ 8W-30-12
Starter Motor Relay.............. 8W-30-11, 18
Transmission Control Module........... 8W-30-4
Water In Fuel Sensor............. 8W-30-11, 25
Wiper/Turn Signal/Engine Start Control
Module.......................... 8W-30-8
VA8W-30 FUEL/IGNITION SYSTEM 8W - 30 - 1

8W-40 INSTRUMENT CLUSTER
Component Page
Airbag Control Module................ 8W-40-3
Ambient Temperature Sensor........... 8W-40-8
Automatic Temperature
Control Module.................. 8W-40-4, 8
Battery............................ 8W-40-2
Brake Fluid Level Switch.............. 8W-40-3
Brake Wear Sensor-Left Front.......... 8W-40-5
Brake Wear Sensor-Left Rear........... 8W-40-5
Brake Wear Sensor-Right Front......... 8W-40-5
Brake Wear Sensor-Right Rear......... 8W-40-5
Courtesy Lamp-Driver Door............ 8W-40-6
Courtesy Lamp-Passenger Door......... 8W-40-6
D+ Relay No. 1...................... 8W-40-8
Data Link Connector................. 8W-40-3
Dome Lamp........................ 8W-40-6
Door Jamb Switch-Driver.............. 8W-40-6
Door Jamb Switch-Passenger........... 8W-40-6
Engine Coolant Level Switch........... 8W-40-7
Fuel Level Sensor.................... 8W-40-3
Fuse 1............................ 8W-40-2
Fuse 6............................ 8W-40-3
Fuse 18............................ 8W-40-2Component Page
Fuse Block No. 1.................... 8W-40-2
Fuse Block No. 2.................... 8W-40-3
G100.............................. 8W-40-7
G200.......................... 8W-40-2, 3, 5
G202.......................... 8W-40-3, 7, 8
G300.............................. 8W-40-5
Generator.......................... 8W-40-2
Headlamp Assembly-Left.............. 8W-40-7
Headlamp Assembly-Right............. 8W-40-7
Ignition Lock Switch................. 8W-40-2
Instrument Cluster....... 8W-40-2, 3, 4, 5, 6, 7, 8
Parking Brake Switch................ 8W-40-3
Power Distribution Center............. 8W-40-2
Radio............................. 8W-40-8
Seat Belt Switch..................... 8W-40-7
Security System Module............... 8W-40-6
Sentry Key Remote Entry Module....... 8W-40-4
Turn Signal/Anti-Theft Alarm Relay-Left . . 8W-40-8
Turn Signal/Anti-Theft Alarm Relay-
Right........................... 8W-40-8
VA8W-40 INSTRUMENT CLUSTER 8W - 40 - 1