sensor MERCEDES-BENZ SPRINTER 2005 Service Workshop Manual

The instrument cluster continually monitors the
status of the driver side front seat belt switch and
the airbag indicator circuit to determine the proper
seatbelt indicator response. The seat belt switch is
connected in series between the instrument cluster
and ground. The seat belt switch and the seatbelt
indicator driver circuit to the instrument cluster can
be diagnosed using conventional diagnostic tools and
methods. For proper diagnosis of the ACM, the air-
bag (SRS) indicator, or the instrument cluster cir-
cuitry that controls the seatbelt indicator, a DRBIIIt
scan tool is required. Refer to the appropriate diag-
nostic information.
SPEEDOMETER
DESCRIPTION
A speedometer is standard equipment on all instru-
ment clusters. The speedometer is located in the cen-
ter of the instrument cluster. The speedometer
consists of a movable gauge needle or pointer con-
trolled by the instrument cluster circuitry and a fixed
210 degree primary outer scale on the gauge dial face
that reads left-to-right either from ª0º to ª100º miles-
per-hour, or from ª0º to ª180º kilometers-per-hour,
depending upon the market for which the vehicle is
manufactured. Each version also has a secondary
inner scale on the gauge dial face that provides the
equivalent opposite units from the primary scale.
Text appearing on the cluster overlay near the left
end of each scale abbreviates the unit of measure,
either ªmphº or ªkm/hº.
The speedometer graphics are white against a
black field, making them clearly visible within the
instrument 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. The
orange gauge needle is internally illuminated. Gauge
illumination is provided by Light Emitting Diode
(LED) units soldered onto the instrument cluster
electronic circuit board. The speedometer is serviced
as a unit with the instrument cluster.
OPERATION
The speedometer gives an indication to the vehicle
operator of the vehicle road speed. This gauge is con-
trolled by the instrument cluster circuit board based
upon cluster programming and electronic messages
received by the cluster from the Controller Anti-lock
Brake (CAB) over the Controller Area Network
(CAN) data bus. The speedometer is an air core mag-
netic unit that receives battery current on the instru-
ment cluster electronic circuit board when the
instrument cluster detects that the ignition switch isin 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:
²Vehicle Speed Message- Each time the clus-
ter receives a vehicle speed message from the CAB it
will calculate the correct vehicle speed reading and
position the gauge needle at that relative speed posi-
tion on the gauge scale. The gauge needle will con-
tinue to be positioned at the actual vehicle speed
position on the gauge scale until the ignition switch
is turned to the Off position.
²Communication Error-
If the cluster fails to
receive a speedometer message, it will hold the gauge
needle at the last indication for about three seconds, or
until the ignition switch is turned to the Off position,
whichever occurs first. After three seconds, the gauge
needle will return to the left end of the gauge scale.
The CAB continually monitors the four wheel
speed sensors to determine the vehicle road speed.
The CAB then sends the proper vehicle speed mes-
sages to the instrument cluster. For proper diagnosis
of the wheel speed sensors, the CAB, the CAN data
bus, or the electronic message inputs to the instru-
ment cluster that control the speedometer, a DRBIIIt
scan tool is required. Refer to the appropriate diag-
nostic information.
TACHOMETER
DESCRIPTION
A tachometer is standard equipment on all instru-
ment clusters. The tachometer is located to the left of
the speedometer, to the left of center in the instru-
ment cluster. The tachometer consists of a movable
gauge needle or pointer controlled by the instrument
cluster circuitry and a fixed 45 degree scale on the
gauge dial face that reads left-to-right from ª0º to ª7º.
The text ªrpm X 1000º imprinted on the cluster over-
lay near the left end of the gauge scale identifies that
each number on the tachometer scale is to be multi-
plied by 1000 rpm.
The tachometer graphics are white against a black
field, 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. The orange
gauge needle is internally illuminated. Gauge illumi-
nation is provided by Light Emitting Diode (LED)
units soldered onto the instrument cluster electronic
circuit board. The tachometer is serviced as a unit
with the instrument cluster.
VAINSTRUMENT CLUSTER 8J - 23
SEATBELT INDICATOR (Continued)

OPERATION
The tachometer gives an indication to the vehicle oper-
ator of the engine speed. This gauge is controlled by the
instrument cluster circuit board based upon cluster pro-
gramming and electronic messages received by the clus-
ter from the Engine Control Module (ECM) over the
Controller Area Network (CAN) data bus. The tachome-
ter is an air core magnetic unit that receives battery cur-
rent 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 posi-
tion. The instrument cluster circuitry controls the gauge
needle position and provides the following features:
²Engine Speed Message- Each time the cluster
receives an engine speed message from the ECM it
will calculate the correct engine speed reading and
position the gauge needle at that relative speed posi-
tion on the gauge scale. The gauge needle will con-
tinually be repositioned at the relative engine speed
position on the gauge scale until the engine stops
running, or until the ignition switch is turned to the
Off position, whichever occurs first.
²Communication Error- If the cluster fails to
receive an engine speed message, it will hold the
gauge needle at the last indication for about three
seconds, or until the ignition switch is turned to the
Off position, whichever occurs first. After three sec-
onds, the gauge needle will return to the left end of
the gauge scale.
The ECM continually monitors the crankshaft position
sensor to determine the engine speed. The ECM then
sends the proper engine speed messages to the instru-
ment cluster. For proper diagnosis of the crankshaft posi-
tion sensor, the ECM, the CAN data bus, or the
electronic message inputs to the instrument cluster that
control the tachometer, a DRBIIItscan tool is required.
Refer to the appropriate diagnostic information.
TRACTION CONTROL
INDICATOR
DESCRIPTION
A traction control (ASR) indicator is standard equip-
ment on all instrument clusters. The traction control
indicator is located near the center of the speedometer
in the instrument cluster. The traction control indicator
consists of an ª!º (exclamation point) imprinted within a
triangular cutout in the opaque layer of the instrument
cluster overlay. The dark outer layer of the overlay pre-
vents 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 exclamation point to appear silhouettedagainst 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 electronic circuit board. The traction
control indicator is serviced as a unit with the instru-
ment cluster.
OPERATION
The traction control (ASR) indicator gives several
indications to the vehicle operator concerning the
operating status of the traction control (ASR) system.
The traction control indicator is controlled by a tran-
sistor on the instrument cluster circuit board based
upon cluster programming and electronic messages
received by the cluster from the Controller Anti-lock
Brake (CAB) over the Controller Area Network
(CAN) data bus. The traction control 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 instru-
ment 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 traction con-
trol indicator for the following reasons:
²Bulb Test-
Each time the ignition switch is
turned to the On position the traction control indicator
is illuminated for about two seconds as a bulb test.
²Traction Control (ASR) Indicator Lamp-On
Message-
Each time the cluster receives a traction
control indicator lamp-on message from the CAB, the
indicator will be illuminated. This indicator can be
flashed on and off, or illuminated solid, as dictated by
the CAB message. The indicator is illuminated solid
when the traction control system has been deactivated;
and is flashed when the traction control is activated or
when the driven wheels lose traction with the traction
control deactivated. The indicator remains flashing or
illuminated solid 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.
The CAB continually monitors the traction control
(ASR) switch and the four wheel speed sensors to deter-
mine the correct operating mode for the traction control
system. The CAB then sends the proper lamp-on or lamp-
off messages to the instrument cluster. See the owner's
manual in the vehicle glove box for more information on
the features, use, activation and deactivation of the trac-
tion control (ASR) system. For proper diagnosis of the
traction control system, the CAB, the CAN data bus, or
the electronic message inputs to the instrument cluster
that control the traction control indicator, a DRBIIIt
scan tool is required. Refer to the appropriate diagnostic
information.
8J - 24 INSTRUMENT CLUSTERVA
TACHOMETER (Continued)

TRACTION CONTROL
MALFUNCTION INDICATOR
DESCRIPTION
A traction control (ASR) malfunction indicator is
standard equipment on all instrument clusters. The
traction control malfunction indicator is located near
the lower edge of the instrument cluster, to the right
of the multi-function indicator display. The traction
control malfunction indicator consists of an icon that
graphically depicts a tire and two skid marks
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 traction control malfunction
indicator is serviced as a unit with the instrument
cluster.
OPERATION
The traction control (ASR) malfunction indicator
gives the vehicle operator an indication when the
traction control system is faulty or inoperative. This
indicator is controlled by a transistor on the instru-
ment cluster circuit board based upon cluster pro-
gramming and electronic messages received by the
cluster from the Controller Antilock Brake (CAB)
over the Controller Area Network (CAN) data bus.
The traction control malfunction 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 instru-
ment 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 traction con-
trol malfunction indicator for the following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the traction control indica-
tor is illuminated as a bulb test until the engine is
started.
²Traction Control (ASR) Malfunction Indica-
tor Lamp-On Message- Each time the cluster
receives a traction control malfunction indicator
lamp-on message from the CAB, the indicator will be
illuminated. The indicator remains illuminated until
the cluster receives a lamp-off message from theCAB, or until the ignition switch is turned to the Off
position, whichever occurs first.
The CAB continually monitors the traction control
(ASR) system circuits and sensors to decide whether
the system is in good operating condition. The CAB
then sends the proper lamp-on or lamp-off messages
to the instrument cluster. If the CAB sends a
lamp-on message after the bulb test, it indicates that
the CAB has detected a system malfunction and that
the traction control (ASR) system has become inoper-
ative. The CAB will store a Diagnostic Trouble Code
(DTC) for any malfunction it detects. In addition, if
the traction control malfunction indicator is illumi-
nated, the CAB will deactivate an activated traction
control system and engine power output may be
reduced. See the owner's manual in the vehicle glove
box for more information on the features, use, activa-
tion and deactivation of the traction control (ASR)
system. For proper diagnosis of the traction control
system, the CAB, the CAN data bus, or the electronic
message inputs to the instrument cluster that control
the traction control malfunction indicator, a DRBIIIt
scan tool is required. Refer to the appropriate diag-
nostic information.
TURN SIGNAL INDICATOR
DESCRIPTION
Two turn signal indicators, one right and one left,
are standard equipment on all instrument clusters.
The turn signal indicators are located near the upper
edge of the instrument cluster, one to each side of the
speedometer. Each turn signal indicator consists of a
arrow-shaped cutout of the International Control and
Display Symbol icon for ªTurn Warningº in the
opaque layer of the instrument cluster overlay. The
dark outer layer of the overlay prevents these icons
from being clearly visible when they are not illumi-
nated. A green Light Emitting Diode (LED) behind
each turn signal indicator cutout in the opaque layer
of the overlay causes the icon to appear in green
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
electronic circuit board. The turn signal indicators
are serviced as a unit with the instrument cluster.
OPERATION
The turn signal indicators give an indication to the
vehicle operator that the turn signal (left or right
indicator flashing) or hazard warning (both left and
right indicators flashing) have been selected and are
operating. These indicators are controlled by transis-
tors on the instrument cluster electronic circuit board
based upon the cluster programming and a hard
VAINSTRUMENT CLUSTER 8J - 25

the wait-to-start indicator will be illuminated. The
indicator remains illuminated until the cluster
receives a wait-to-start lamp-off message indicating
that the pre-heat mode of the glow plugs has been
completed, until the ECM detects that the engine is
running, or until the ignition switch is turned to the
Off position, whichever occurs first.
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 DRBIIItscan 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 theinstrument 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 the
ignition 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 DRBIIIt
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
VAINSTRUMENT CLUSTER 8J - 27
WAIT-TO-START INDICATOR (Continued)

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
detected in the fuel filter. This indicator is controlled
by a transistor on the instrument cluster circuit
board based upon the cluster programming and elec-
tronic messages received by the cluster from the
Engine Control Module (ECM) over the Controller
Area Network (CAN) data bus. The water-in-fuel
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 posi-
tion 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
water-in-fuel indicator for the following reasons:
²Bulb Test- Each time the ignition switch is
turned to the On position the water-in-fuel indicator
is illuminated for about seven seconds as a bulb test.²Water-In-Fuel Lamp-On Message- Each time
the cluster receives a water-in-fuel lamp-on message
from the ECM indicating that there is excessive
water in the fuel filter with the engine running, the
water-in-fuel indicator will be illuminated. The indi-
cator remains illuminated until the cluster receives a
water-in-fuel lamp-off message, or until the ignition
switch is turned to the Off position, whichever occurs
first.
The ECM continually monitors the water-in-fuel
sensor to determine whether there is excessive water
in the fuel filter. The ECM then sends the proper
water-in-fuel lamp-on and lamp-off messages to the
instrument cluster. If the water-in-fuel indicator
remains illuminated with the engine running, excess
water should be drained from the fuel filter. If the
indicator remains illuminated with the engine run-
ning after the water has been drained from the fuel
filter, it may indicate that a malfunction has
occurred in the water-in-fuel sensor or circuits. The
ECM will store a Diagnostic Trouble Code (DTC) for
any malfunction it detects. For proper diagnosis of
the water-in-fuel sensor and circuits, the ECM, the
CAN data bus, or the electronic message inputs to
the instrument cluster that control the water-in-fuel
indicator, a DRBIIItscan tool is required. Refer to
the appropriate diagnostic information.
8J - 28 INSTRUMENT CLUSTERVA
WATER-IN-FUEL INDICATOR (Continued)

²Trailer Tow Connector- Vehicles equipped
with a factory-approved, field-installed trailer towing
electrical package have a heavy duty 7-way trailer
tow connector installed in a bracket on the trailer
hitch receiver. This package includes a 7-way to
4-way connector adapter unit.
²Trailer Tow Control Module- Vehicles
equipped with a factory-approved, field-installed
trailer towing electrical package have a trailer tow
brake/turn control module located within the driver
side front seat riser that controls the brake lamp and
turn signal lamp outputs to the trailer lighting cir-
cuits.
²Turn Signal Relay- A turn signal relay is
installed in the fuse block located on the underside of
the steering column behind a fuse access panel in the
steering column opening cover on the instrument
panel. The electronic circuitry of the wipers, turn sig-
nals and engine start control module within the fuse
block controls the turn signal relay.
²Wipers, Turn Signals, Engine Start Control
Module- The wipers, turn signals and engine start
control module is integral to the fuse block located on
the underside of the steering column behind a fuse
access panel in the steering column opening cover on
the instrument panel. This module includes active
electronic elements that control the operation of the
turn signal relay based upon inputs from the multi-
function switch and feedback from the turn signal
circuits. (Refer to 8 - ELECTRICAL/POWER DISTRI-
BUTION/FUSE BLOCK - DESCRIPTION).
Hard wired circuitry connects the exterior lighting
system components to the electrical system of the
vehicle. These hard wired circuits are integral to sev-
eral wire harnesses, which are routed throughout the
vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the exterior lighting
system components through the use of a combination
of soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.
OPERATION
Following are paragraphs that briefly describe the
operation of each of the major exterior lighting sys-
tems. The hard wired circuits and components of the
exterior lighting systems may be diagnosed and
tested using conventional diagnostic tools and proce-
dures. However, conventional diagnostic methods
may not prove conclusive in the diagnosis of the wip-ers, turn signals and engine start control module
located within the fuse block underneath the steering
column, the ElectroMechanical Instrument Cluster
(EMIC), the Engine Control Module (ECM), or the
Controller Area Network (CAN) data bus network.
The most reliable, efficient, and accurate means to
diagnose the electronic module within the fuse block,
the EMIC, the ECM, and the CAN data bus network
inputs and outputs related to the various exterior
lighting systems requires the use of a DRBIIItscan
tool. Refer to the appropriate diagnostic information.
BACKUP LAMPS
The backup (or reverse) lamps have a path to
ground received at all times through the vehicle wire
harness from a ground point located on the frame
near the left end of the tailgate sill. The backup
lamps receive battery current on the backup lamp
supply circuit only when the backup lamp switch cir-
cuit of the Transmission Range Sensor (TRS) integral
to the gear shifter assembly is closed by the gear
shifter mechanism.
BRAKE LAMPS
The brake (or stop) lamps have a path to ground at
all times through the vehicle wire harness from a
ground point located on the frame near the left end
of the tailgate sill. The Center High Mounted Stop
Lamp (CHMSL) has a path to ground at all times
through the vehicle wire harness from a ground point
on the left side of the dash panel. The brake lamps
and CHMSL receive battery current on the brake
lamp switch output circuit when the brake lamp
switch is closed by the brake pedal arm.
DAYTIME RUNNING LAMPS
Vehicles manufactured for sale in Canada illumi-
nate the low beam headlamp bulb when the engine is
running and the exterior lamps are turned off. This
feature is enabled by the right and left Daytime Run-
ning Lamps (DRL) relays. When the DRL relays are
de-energized, they provide fused battery current from
the circuit K26 relay to the headlamp low beams.
When the headlamps are turned On using the left
(lighting) control stalk of the multi-function switch
the DRL relays are energized, which returns control
of the headlamps to the headlamp switch circuitry of
the multi-function switch. The circuit K26 relay is
energized by the Electro-Mechanical Instrument
Cluster (EMIC) whenever it receives an electronic
message from the Engine Control Module (ECM) over
the Controller Area Network (CAN) data bus indicat-
ing that the engine is running. The DRL and circuit
K26 relays are installed in a relay bracket located
below the forward edge of the driver side front seat
cushion within the driver side front seat riser.
VALAMPS/LIGHTING - EXTERIOR 8L - 3
LAMPS/LIGHTING - EXTERIOR (Continued)

LAMPS/LIGHTING - INTERIOR
TABLE OF CONTENTS
page page
LAMPS/LIGHTING - INTERIOR
DESCRIPTION.........................25
OPERATION...........................26
SPECIFICATIONS - INTERIOR LIGHTING.....26
ASH RECEIVER/CIGAR LIGHTER LAMP UNIT
REMOVAL.............................27
INSTALLATION.........................27
CARGO/DOME LAMP BULB
REMOVAL.............................27
INSTALLATION.........................27
CARGO/DOME LAMP UNIT
REMOVAL.............................28
INSTALLATION.........................28
CARGO LAMP SWITCH
REMOVAL
REMOVAL - INSTRUMENT PANEL........28
REMOVAL - BULKHEAD................28
REMOVAL - REAR PILLAR..............28
INSTALLATION
INSTALLATION - INSTRUMENT PANEL.....29
INSTALLATION - BULKHEAD.............29
INSTALLATION - REAR PILLAR...........29
DOME/READING LAMP BULB
REMOVAL.............................29INSTALLATION.........................29
DOME/READING LAMP UNIT
REMOVAL.............................30
INSTALLATION.........................30
DOME LAMP/INTRUSION SENSOR BULB
REMOVAL.............................30
INSTALLATION.........................30
DOME LAMP/INTRUSION SENSOR
REMOVAL.............................31
INSTALLATION.........................31
DOOR JAMB SWITCH
REMOVAL.............................31
INSTALLATION.........................31
ENTRY/EXIT LAMP BULB
REMOVAL.............................31
INSTALLATION.........................32
ENTRY/EXIT LAMP UNIT
REMOVAL.............................32
INSTALLATION.........................32
TIME DELAY RELAY
REMOVAL.............................32
INSTALLATION.........................33
LAMPS/LIGHTING - INTERIOR
DESCRIPTION
The interior lighting for this model includes the
following standard and optional incandescent interior
lamps and controls:
²Ash Receiver/Cigar Lighter Lamp- An avail-
able ash receiver/cigar lighter lamp is secured by an
integral mount to the outside of the cigar lighter halo
ring. A single lamp serves to illuminate both the
translucent halo ring and the ash receiver.
²Cargo/Dome Lamp- Several cargo/dome lamp
units located overhead in both the front and rear of
the vehicle interior are standard equipment. These
lamps feature a single incandescent bulb. An optional
version of these lamps includes an integral three-po-
sition switch that protrudes through the lamp lens.
²Cargo Lamp Switch- Toggle-type remote
cargo lamp switches located in the accessory switch
bezel in the center of the instrument panel, on the
back side of the cargo compartment bulkhead panel,
and on the rear cargo door pillar are an available
option on all van models. The instrument panelswitch has two Light-Emitting Diode (LED) units,
one for illumination and a second that provides an
indication. The switches mounted in the cargo com-
partment also have two LED units, but only the indi-
cation LED unit is functional in this application.
²Dome/Reading Lamp- An optional equipment
dome/reading lamp unit is located in the windshield
header area between the driver and passenger sun
visors. This lamp features two incandescent bulbs,
one dome lamp bulb and a second, dedicated reading
lamp bulb. An integral four-position switch protrudes
through the lamp lens.
²Dome Lamp/Intrusion Sensor- An optional
equipment dome lamp/intrusion sensor unit is
located overhead in the vehicle interior. This lamp
features four incandescent bulbs, two for dome lamps
and two for dedicated right and left reading lamps.
This lamp has two integral three-position switches,
one to control interior lamp operation and one to con-
trol reading lamp operation. This lamp also houses
three intrusion sensors that are part of an optional
vehicle theft security system.
²Door Jamb Switch- A door jamb switch for
each front door is standard equipment on all models.
VALAMPS/LIGHTING - INTERIOR 8L - 25

A door jamb switch for each sliding side door and the
right rear door is standard equipment on wagon mod-
els. The sliding and rear door jamb switches are not
available for van models.
²Entry/Exit Lamp- An entry/exit lamp to illu-
minate each front and sliding side door step well is
optional equipment on wagon models.
²Time Delay Relay- Vehicles equipped with the
optional remote cargo lamp switches also have a time
delay relay located in the electrical center within the
driver side front seat riser.
Hard wired circuitry connects the interior lighting
system components to the electrical system of the
vehicle. These hard wired circuits are integral to sev-
eral wire harnesses, which are routed throughout the
vehicle and retained by many different methods.
These circuits may be connected to each other, to the
vehicle electrical system and to the interior lighting
system components through the use of a combination
of soldered splices, splice block connectors, and many
different types of wire harness terminal connectors
and insulators. Refer to the appropriate wiring infor-
mation. The wiring information includes wiring dia-
grams, proper wire and connector repair procedures,
further details on wire harness routing and reten-
tion, as well as pin-out and location views for the
various wire harness connectors, splices and grounds.
OPERATION
The interior lighting systems can be divided into
two general classifications based upon the circuit
that controls their operation: The interior lighting
circuit, or the exterior lighting circuit. The hard
wired circuits and components of the interior lighting
systems may be diagnosed and tested using conven-
tional diagnostic tools and procedures.
INTERIOR LIGHTING CIRCUIT
Depending upon the vehicle model (van or wagon)
and the selected vehicle options the interior lighting
circuit may include dome/cargo lamps located over-
head in the front and rear of the vehicle, a dome/
reading lamp located in the header area above the
windshield between the sun visors, and entry/exit
lamps located in the front and sliding side door step
wells.
WAGON MODELS
In all wagon models, the lamps in the interior
lighting circuit are provided with battery current at
all times by a fuse in the fuse block beneath the
steering column. The front, side, and rear door jamb
switches control a ground path for each of these
lamps, except for the optional reading lamp. If the
lamp has an optional integral switch, that switch has
three separate positions. The first position provides aground path independent of the door jamb switches
to turn the lamp On. The second, or center position
allows the door jamb switches to control the lamp.
The third position segregates that lamp from the
door jamb switch input, turning the lamp Off. In the
case of the optional dome/reading lamp, the integral
lamp switch has a fourth position which will illumi-
nate only the reading lamp bulb.
VAN MODELS
Unless a van model is equipped with an optional
remote cargo lamp switch, all of the lamps in the
interior lighting circuit operate the same way as the
wagon models except that there are only two door
jamb switches, one for each front door. If the vehicle
is equipped with an optional remote cargo lamp
switch, the lamps in the rear of the vehicle on the
interior lighting circuit are provided with battery
current by the time delay relay. The time delay relay
is a smart relay containing active electronic elements
that comprise an electronic timer logic circuit. When
the remote cargo lamp switches provide the proper
input to the time delay relay, the relay logic responds
by energizing the relay control coil. The energized
relay control coil provides battery current to all of
the lamps on the rear interior lighting circuit and to
the indicator Light-Emitting Diode (LED) units in
the remote cargo switches causing each to illuminate.
If a remote cargo lamp switch remains On for more
than about fifteen minutes, the time delay relay will
then automatically de-energize the rear interior
lighting circuits until the remote cargo lamp switch
is cycled Off and then back On.
EXTERIOR LIGHTING CIRCUIT
The exterior lighting circuit provides battery cur-
rent to the optional ash receiver/cigar lighter lamp
and to the illumination Light-Emitting Diode (LED)
unit within the remote cargo lamp switch in the
instrument panel accessory switch bezel whenever
the exterior lamps are turned On.
SPECIFICATIONS - INTERIOR LIGHTING
BULB SPECIFICATIONS
LAMP BULB
Cargo/Dome Lamp K - 12V 18W
Dome/Reading Lamp K - 12V 10W
Dome Lamp w/Intrusion
SensorK - 12V 6W
Entry/Exit Lamp W5W - 12V 5W
8L - 26 LAMPS/LIGHTING - INTERIORVA
LAMPS/LIGHTING - INTERIOR (Continued)

DOME/READING LAMP UNIT
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Insert the tip of a small flat-bladed screwdriver
into the notch on one edge of the dome/reading lamp
housing to depress the retainer clip and pull that
edge of the lamp away from its mounting location
(Fig. 6).
(3) Pull the dome/reading lamp unit from its
mounting location far enough to access and discon-
nect the vehicle wire harness from the lamp connec-
tor receptacle.
(4) Remove the dome/reading lamp unit from its
mounting location.
INSTALLATION
(1) Position the dome/reading lamp unit to its
mounting location.
(2) Reconnect the vehicle wire harness connector
to the dome/reading lamp connector receptacle (Fig.
6).
(3) Position the edge of the dome/reading lamp
housing opposite from the retainer clip into the
mounting hole.
(4) Push firmly and evenly on the notched edge of
the dome/reading lamp housing until the retainer
clip latches into place.
(5) Reconnect the battery negative cable.
DOME LAMP/INTRUSION
SENSOR BULB
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the dome lamp/intrusion sensor unit
from its mounting location, but do not disconnect the
vehicle wire harness from the lamp connector recep-
tacle. (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING
- INTERIOR/DOME LAMP/INTRUSION SENSOR
UNIT - REMOVAL).
(3) Grasp the lamp housing in one hand and rotate
the bulb holder and bulb unit counterclockwise about
30 degrees on the circuit board (Fig. 7).
(4) Pull the bulb holder and bulb unit straight out
from the mounting hole in the circuit board.
INSTALLATION
(1) Grasp the dome lamp/intrusion sensor unit
housing in one hand and align the bulb holder and
bulb unit with the bulb mounting hole in the circuit
board with the other hand (Fig. 7).
(2) Insert the bulb holder and bulb unit straight
into the circuit board bulb mounting hole until it is
firmly seated.
(3) Rotate the bulb holder and bulb unit clockwise
about 30 degrees on the circuit board.
(4) Reinstall the dome lamp/intrusion sensor unit
into its mounting location. (Refer to 8 - ELECTRI-
CAL/LAMPS/LIGHTING - INTERIOR/DOME LAMP/
INTRUSION SENSOR UNIT - INSTALLATION).
(5) Reconnect the battery negative cable.
Fig. 6 Dome/Reading Lamp Unit Remove/Install
1 - LAMP HOUSING
2 - SWITCH BUTTON
3 - NOTCH
4 - SUN VISOR (2)
5 - HEADLINER
Fig. 7 Dome Lamp/Intrusion Sensor Bulb Remove/
Install
1 - BULB HOLDER/BULB (4)
2 - LAMP HOUSING
8L - 30 LAMPS/LIGHTING - INTERIORVA

DOME LAMP/INTRUSION
SENSOR
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Insert the tip of a small flat-bladed screwdriver
into the notch on one edge of the dome lamp/intru-
sion sensor unit housing to depress the retainer clip
and pull that edge of the lamp away from its mount-
ing location (Fig. 8).
(3) Pull the dome lamp/intrusion sensor unit from
its mounting location far enough to access and dis-
connect the vehicle wire harness from the lamp con-
nector receptacle.
(4) Remove the dome lamp/intrusion sensor unit
from its mounting location.
INSTALLATION
(1) Position the dome lamp/intrusion sensor unit to
its mounting location (Fig. 8).
(2) Reconnect the vehicle wire harness connector
to the dome lamp/intrusion sensor unit connector
receptacle.
(3) Position the edge of the dome lamp/intrusion
sensor unit housing opposite from the retainer clip
into the mounting hole.
(4) Push firmly and evenly on the notched edge of
the dome lamp/intrusion sensor unit housing until
the retainer clip latches into place.
(5) Reconnect the battery negative cable.
DOOR JAMB SWITCH
REMOVAL
(1) Disconnect and isolate the battery negative
cable.(2) Open the door and remove the screw that
secures the door jamb switch to the hinge pillar of
the door opening (Fig. 9).
(3) Pull the door jamb switch away from the
mounting hole in the pillar far enough to access and
disconnect the vehicle wire harness connector from
the back of the switch.
INSTALLATION
(1) Position the door jamb switch close enough to
the mounting hole in the hinge pillar of the door
opening to reconnect the vehicle wire harness connec-
tor to the back of the switch.
(2) Position the door jamb switch into the mount-
ing hole in the hinge pillar (Fig. 9).
(3) Install and tighten the screw that secures the
door jamb switch to the hinge pillar.
(4) Reconnect the battery negative cable.
ENTRY/EXIT LAMP BULB
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the entry/exit lamp unit from its
mounting location. (Refer to 8 - ELECTRICAL/
LAMPS/LIGHTING - INTERIOR/ENTRY/EXIT
LAMP UNIT - REMOVAL).
(3) Grasp the lamp housing firmly in one hand,
then rotate the bulb holder counterclockwise and pull
it straight out from the housing with the other hand
(Fig. 10).
(4) Remove the bulb from the bulb holder.
Fig. 8 Dome Lamp/Intrusion Sensor Unit Remove/
Install
1 - NOTCH
2 - SENSOR (3)
3 - HOUSING
4 - SWITCH (2)
Fig. 9 Door Jamb Switch Remove/Install
1 - DOOR JAMB SWITCH
2 - PLUNGER
3 - PILLAR
4 - SCREW
VALAMPS/LIGHTING - INTERIOR 8L - 31