rear view mirror MERCEDES-BENZ SPRINTER 2006 Service Manual

WARNING:REASSEMBLE ALL COMPONENTS
BEFORE ROAD TESTING A VEHICLE. DO NOT
TRY TO READ THE DRBIIITSCREEN OR
OTHER TEST EQUIPMENT DURING A TEST
DRIVE. DO NOT HANG THE DRBIIITOR OTHER
TEST EQUIPMENT FROM THE REARVIEW
MIRROR DURING A TEST DRIVE. HAVE AN
ASSISTANT AVAILABLE TO OPERATE THE
DRBIIITOR OTHER TEST EQUIPMENT.
FAILURE TO FOLLOW THESE INSTRUCTIONS
CAN RESULT IN PERSONAL INJURY OR
DEATH.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(diagnostic read-out box)
Jumper wires
Ohmmeter
Voltmeter
Test Light
8310 Airbag System Load Tool
8443 SRS Airbag System Load Tool
9001 R F Detector
6.0 GLOSSARY OF TERMS
ABSantilock brake system
ACMairbag control module
ACTactuator
AECMairbag electronic control module
(ACM)
ASDMairbag system diagnostic module
(ACM)
AT Cautomatic temperature control
CABcontroller antilock bake
CANcontroller area network
CHMcabin heater module
CPAconnector positive assurance
CTMcentral timer module
DABdriver airbag
DCHAdiesel cabin heater assist (cabin
heater)
DLCdata link connector
DTCdiagnostic trouble code
DRdriver
EBLelectric back lite (rear window de
fogger)
ECMengine control module
GCCGulf Coast Countries
HBMheater booster module
HVACheater ventilation, air conditioning
ICinstrument cluster
MICmechanical instrument cluster
RSMRain Sensor Module
SAshifter assembly
SKREEMsentry key remote entry module
SSMsecurity system module
TCMtransmission control module
13
GENERAL INFORMATION

Symptom:
CHECKING THE RAIN SENSOR/WIPER OPERATION
POSSIBLE CAUSES
CHECK THE WIPER MOTOR CIRCUIT CAVITY 2
CHECK THE WIPER MOTOR CIRCUIT CAVITY 5
CHECK THE WIPER MOTOR CIRCUIT CAVITY 5 II
CHECK THE WIPER MOTOR CIRCUIT CAVITY 6
CHECK THE WIPER MOTOR CIRCUIT CAVITY 6 II
CHECK WIPER MOTOR GROUND CIRCUIT
CHECKING THE 12 VOLT POWER SUPPLY
CHECKING THE GROUND CIRCUIT
CHECKING THE RAIN SENSOR OPERATION
CHECKING WIPER SIGNALS TO THE RAIN SENSOR MODULE
RAIN SENSOR
RAIN SENSOR CIRCUIT(S) OPEN
RAIN SENSOR CIRCUIT(S) SHORTED TO GROUND
RAIN SENSOR CIRCUIT(S) SHORTED TO VOLTAGE
RAIN SENSOR MODULE
RAIN SNSR CKTS SHORTED TOGETHER
WIPER MOTOR
TEST ACTION APPLICABILITY
1 Turn the ignition on.
Monitor the windshield wipers while turning the wiper switch to each of the 4 switch
positions: OFF, INTERMITTENT, LOW and HIGH.
Did the wipers functions properly in each wiper switch position?All
Ye s!Go To 2
No!Go To 8
2NOTE: The Rain Sensor is located in the windshield mount of the rear view
mirror in the top-center of the windshield.
NOTE: The Rain Sensor Module (RSM) is mounted above the accelerator
pedal assembly.
Turn the ignition on.
Move the Wiper Switch to the Intermittent position.
Spray or pour water on the Rain Sensor area of the windshield.
Did the wipers activate when water was sprayed/poured on the Rain Sensor area of
the windshield?All
Ye s!Rain Sensor/Wiper System operating properly. Test complete.
No!Go To 3
239
WINDSHIELD WIPER & WASHER

TEST ACTION APPLICABILITY
3 Turn the ignition off.
Disconnect the Rain Sensor Module harness connector.
Measure the resistance between ground and each of the Rain Sensor circuits at the
Rain Sensor Module harness connector.
Is the resistance above 1000 ohms for each measurement?All
Ye s!Go To 4
No!Repair the circuit(s) that measured below 1000 ohms for a short to
ground.
4 Turn the ignition off.
Disconnect the Rain Sensor Module harness connector.
Turn the ignition on.
Measure the voltage of each of the Rain Sensor circuits at the Rain Sensor Module
harness connector.
Is the voltage below 1.0 volt for each measurement?All
Ye s!Go To 5
No!Repair the circuit(s) that measured above 1.0 volt for a short to
voltage.
5 Turn the ignition off.
Disconnect the Rain Sensor harness connector.
Disconnect the Rain Sensor Module harness connector.
Measure the resistance of each Rain Sensor circuit between the Rain Sensor Module
harness connector and the Rain Sensor harness connector.
Is the resistance below 10.0 ohms for each measurement?All
Ye s!Go To 6
No!Repair the circuit(s) that measured above 10.0 ohms for an open.
6 Turn the ignition off.
Disconnect the Rain Sensor harness connector.
Disconnect the Rain Sensor Module harness connector.
Measure the resistance between Rain Sensor harness connector cavities 1 and 2.
Repeat this step for cavities 1 and 3, cavities 2 and 3.
Is the resistance above 1000 ohms for each measurement?All
Ye s!Go To 7
No!Repair the circuit(s) that measured below 1000 ohms for a short
together.
7 Turn the ignition off.
Replace the Rain Sensor in accordance with the Service Information.
Turn the ignition on.
Move the Wiper Switch to the Intermittent position.
Spray or pour water on the Rain Sensor area of the windshield.
NOTE: The Rain Sensor is located in the windshield mount of the rear view
mirror in the top-center of the windshield.
Did the wipers activate when water was sprayed/poured on the Rain Sensor area of
the windshield?All
Ye s!Replace the original Rain Sensor in accordance with the Service
Information.
No!Replace the Rain Sensor Module in accordance with the Service
Information.
240
WINDSHIELD WIPER & WASHER
CHECKING THE RAIN SENSOR/WIPER OPERATION ÐContinued

4.2.4 DRBIIITSAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIITMULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLE FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND THE SPECIFICATION LIMITS.
²Follow the vehicle manufacturer 's service speci-
fications at all times.
²Do not use the DRBIIItif it has been damaged.
²Do not use the test leads if the insulation is
damaged or if metal is exposed.
²To avoid electrical shock, do not touch the test
leads, tips, or the circuit being tested.
²Choose the proper range and function for the
measurement. Do not try voltage or current mea-
surements that may exceed the rated capacity.
²Do not exceed the limits shown in the table below:
FUNCTION INPUT LIMIT
Volts 0 - 500 peak volts AC
0 - 500 volts DC
Ohms (resistance)* 0 - 1.12 megaohms
Frequency Measured
Frequency Generated0-10kHz
Temperature -58 - +1100ÉF
-50 - +600ÉC
* Ohms cannot be measured if voltage is present.
Ohms can be measured only in a non-powered
circuit.
± Voltage between any terminal and ground
must not exceed 500v DC or 500v peak AC.
± Use caution when measuring voltage above
25v DC or 25v AC.
± Use the low current shunt to measure circuits
up to 10A. Use the high current clamp to
measure circuits exceeding 10A.
± When testing for the presence of voltage or
current, make sure the meter is functioning
correctly. Take a reading of a known voltage or
current before accepting a zero reading.
± When measuring current, connect the meter in
series with test load.
± When using the meter function, keep the
DRBIIItaway from spark plug or coil wires to
avoid measuring error from outside interfer-
ence.
4.3 WARNING
4.3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sure the ignition is ``off ''. Failure to do so could
damage the module.
When testing voltage or continuity at any control
module, use the terminal side (not the wire end) of
the connector. Do not probe a wire through the
insulation; this will damage it and eventually cause
it to fail because of corrosion.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
4.3.2 ROAD TESTING A COMPLAINT
VEHICLE
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
CAUTION: Before road testing a vehicle, be
sure that all components are reassembled.
During the test drive, do not try to read the
DRBIIITscreen while in motion. Do not hang
the DRBIIITfrom the rear view mirror or
operate it yourself. Have an assistant
available to operate the DRBIIIT.
4.4 DIAGNOSIS
1. Your diagnostic test procedure must begin with a
thorough visual inspection of the system in ques-
tion for damaged components or disconnected
connectors. For ABS, the brake lamps must be
operational prior to continuing.
2. Connect the DRBIIItto the data link connector
located under the dash. If the DRBIIItdoes not
power up, check the power and ground supplies
to the connector.
3. Select the system in question. Turn the ignition
on. If the DRBIIItdisplays ``No Responseº, refer
to Communication in the Body Diagnostic Pro-
cedures manual to diagnose the symptom.
4. Read and record all diagnostic trouble codes. If
any additional codes are present, proceed to the
appropriate test.
5. For ABS, if there are no diagnostic trouble codes
present, select ``Inputs/Outputs'' and read the
Brake Switch and Brake Lamp Switch inputs as
you press and release the brake pedal. If the
6
GENERAL INFORMATION

service manual. Following these procedures is very
important to the safety of the individuals perform-
ing the diagnostic tests.
4.2.2 VEHICLE PREPARATION FOR
TESTING
Make sure the vehicle being tested has a fully
charged battery. If it does not, false diagnostic codes
or error messages may occur.
4.2.3 SERVICING SUB-ASSEMBLIES
Some components of the powertrain system are
intended to be serviced as an assembly only. At-
tempting to remove or repair certain system sub-
components may result in personal injury and/or
improper system operation. Only those components
with approved repair and installation procedures in
the service manual should be serviced.
4.2.4 DRBIIITSAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THE
DRBIIITMULTIMETER IS DANGEROUS. IT
CAN EXPOSE YOU TO SERIOUS OR
POSSIBLE FATAL INJURY. CAREFULLY
READ AND UNDERSTAND THE CAUTIONS
AND SPECIFICATION LIMITS.
Follow the vehicle manufacturer 's service specifi-
cations at all times.
± Do not use the DRBIIItif it has been dam-
aged.
± Do not use the test leads if the insulation is
damaged or if metal is exposed.
± To avoid electrical shock, do not touch the test
leads, tip or the circuit being tested.
± Choose the proper range and function for the
measurement. Do not try voltage or current
measurements that may exceed the rated ca-
pacity.
± Do not exceed the limits shown in the table
below:
FUNCTION INPUT LIMIT
Volts 0±500 peak volts AC
0±500 volts DC
Ohms (Resistance)* 0±1.12 megaohms
Frequency Measure
Frequency Generated0±10 kHz
Temperature ±58 ± +1100ÉF
±50 ± +600ÉC
* Ohms cannot be measured if voltage is present.
Ohms can be measured only on a non-powered
circuit.± Voltage between any terminal and ground
must not exceed 500v DC or 500v peak AC.
± Use caution when measuring voltage above
25v DC or 25v AC.
± The circuit being tested must be protected by a
10 amp fuse or circuit breaker.
± Use the low current shunt to measure circuits
up to 10 amps. Use the high current shunt to
measure circuits exceeding 10 amps.
± When testing for the presence of voltage or
current, make sure the meter is functioning
correctly. Take a reading of a known voltage or
current before accepting a zero reading.
± When measuring current, connect the meter in
series with the load.
± Disconnect the live test lead before disconnect-
ing the common test lead.
4.3 WARNINGS AND CAUTIONS
4.3.1 ROAD TEST WARNINGS
Some complaints will require a test drive as part
of the repair verification procedure. The purpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
CAUTION: Before road testing a vehicle, be
sure that all components are reassembled.
During the test drive, do not hang the DRBIIIT
from the rear view mirror. Do not attempt to
read the DRBIIITwhile driving. Have an
assistant available to operate the DRBIIIT.
4.3.2 VEHICLE DAMAGE CAUTIONS
Before disconnecting any control module, make
sure the ignition is off. Failure to do so could
damage the module. When testing voltage or circuit
integrity at any control module, use the terminal
side (not the wire end) of the harness connector. Do
not probe through the insulation; this will damage
it and eventually cause it to fail because of corro-
sion.
Be careful when performing electrical test so as to
prevent accidental shorting of terminals. Such a
mistake can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
5.0 REQUIRED TOOLS AND
EQUIPMENT
DRBIIIt(diagnostic read-out box) scan tool
vacuum gauge
ammeter
9
GENERAL INFORMATION

HEATED MIRRORS
TABLE OF CONTENTS
page page
HEATED MIRRORS
DESCRIPTION..........................9OPERATION............................9
HEATED MIRRORS
DESCRIPTION
The available heated outside rear view mirror sys-
tem is operational anytime the ignition switch is in
the Run position (Fig. 1). When energized, each of
these heater grids produce heat to help clear the out-
side mirrors of ice, snow, or fog.
OPERATION
The electric heater grid located behind the glass of
each of the outside rear view mirrors is energized
when the ignition switch is turned to the Run posi-
tion. The heater grids heat the glass surface of the
outside rear view mirrors.
If the outside mirror heating grids are inoperative,
refer to 8W - WIRING DIAGRAM INFORMATION.
The heating grid behind each outside mirror glass
cannot be repaired and, if faulty or damaged, the
mirror glass must be replaced (Refer to 23 - BODY/
EXTERIOR/MIRROR-SIDE VIEW - GLASS -
REMOVAL).
Fig. 1 SIDE VIEW MIRROR - GLASS
1 - MIRROR GLASS
2 - ELECTRICAL CONNECTORS
3 - GUIDES
VAHEATED MIRRORS 8G - 9

POWER MIRRORS
TABLE OF CONTENTS
page page
POWER MIRRORS
DESCRIPTION..........................3
POWER MIRROR SWITCH
DIAGNOSIS AND TESTING - POWER MIRROR
SWITCH.............................3REMOVAL.............................3
INSTALLATION..........................4
POWER MIRRORS
DESCRIPTION
The power operated outside rear view mirrors
allow the driver to adjust both outside mirrors elec-
trically from the driver side front seat position by
operating a switch on the driver side front door trim
panel. The power mirrors receive a non-switched bat-
tery feed through a fuse so that the system will
remain operational, regardless of the ignition switch
position.
POWER MIRROR SWITCH
DIAGNOSIS AND TESTING - POWER MIRROR
SWITCH
(1) Disconnect and isolate the battery negative
cable.
(2) Remove power mirror switch (Refer to 8 -
ELECTRICAL/POWER MIRRORS/POWER MIRROR
SWITCH - REMOVAL).
(3) Using an ohmmeter, test for continuity between
the terminals of the switch (Fig. 1).
MIRROR SWITCH TEST
MIRROR SELECT SWITCH IN ªLEFTº
POSITION
BUTTON
POSI-
TIONCONTINUITY BETWEEN
UP PIN 6 AND 9
PIN 6 AND 8
DOWN PIN 2 AND 4
PIN 6 AND 10
LEFT PIN 2 AND 3
PIN 6 AND 10
RIGHT PIN 2 AND 3
PIN 6 AND 2
MIRROR SELECT SWITCH IN ªRIGHTº
POSITION
BUTTON
POSI-
TIONCONTINUITY BETWEEN
UP PIN 6 AND 8
PIN 6 AND 9
DOWN PIN 6 AND 3
LEFT PIN 1 AND 7
RIGHT PIN 1 AND 8
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the door handle trim.
(3) Remove the mirror switch/power window
switch trim (Fig. 2).
Fig. 1 POWER MIRROR SWITCH
VAPOWER MIRRORS 8N - 3

both the wiper and washer systems. (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/
MULTI-FUNCTION SWITCH - DESCRIPTION)
²Rain Sensor- Vehicles equipped with an
optional automatic wiper feature have an electronic
rain sensor concealed within the base of the rear
view mirror unit on the inside of the laminated wind-
shield glass.
²Rain Sensor Control Module- Vehicles
equipped with an optional automatic wiper feature
have an electronic rain sensor control module located
under the lower instrument panel above the acceler-
ator pedal in the passenger compartment of the vehi-
cle.
²Washer Fluid Level Switch- The optional
washer fluid level switch is integral to a unique ver-
sion of the washer pump/motor unit, which is located
in a dedicated hole on the top of the sump area near
the back of the windshield washer reservoir on the
right front fender wheel house in the engine com-
partment.
²Washer Nozzle- A single washer nozzle with
three separate orifices is secured with integral snap
features to each wiper arm. The hoses for the washer
nozzles are concealed beneath a molded plastic guide
on the underside of each wiper arm and routed to the
engine compartment through unique molded plastic
elbow fittings located near each wiper pivot at the
base of the windshield.
²Washer Pump/Motor- Two different washer
pump/motor units are available for this model. One
version has an integral washer fluid level switch that
provides a hard wired input to the instrument cluster
for control of the optional washer fluid indicator. The
washer pump/motor unit is located in a dedicated
hole on the top of the sump area near the back of the
windshield washer reservoir on the right front fender
wheel house in the engine compartment.
²Washer Reservoir- The washer reservoir is
located on the right front fender wheel house in the
engine compartment. The washer reservoir filler is
accessed from the right front corner of the engine
compartment.
²Wiper Arm- The two unequal length wiper
arms are secured to the two wiper pivots, which
extend through the cowl panel near the base of the
windshield. The longer arm is installed on the left
(driver) side of the windshield.
²Wiper Blade- The two unequal length wiper
blades are secured to the two wiper arms, and are
parked on the glass near the bottom of the wind-
shield when the wiper system is not in operation.
The longer blade is installed on the left (driver) side
of the windshield.
²Wiper Linkage- The wiper pivots are the only
visible components of the wiper linkage. The remain-
der of the linkage is concealed within the engine
compartment just behind the hood opening. Thewiper linkage module includes the two wiper drive
links, the wiper motor crank arm, the two wiper piv-
ots, and the linkage and motor mounting bracket.
²Wiper Motor- The wiper motor is secured to
the wiper linkage module bracket on the underside of
the cowl panel within the engine compartment. The
wiper motor output shaft and crank arm extend
through a clearance hole in the mounting bracket,
where they are connected to a crank arm that drives
the wiper linkage.
²Wiper Relay- The wiper relay is located in a
dedicated receptacle on the lower left surface of the
fuse block underneath the steering column behind
the fuse access panel and the steering column open-
ing panel. The wiper relay is a passive component on
vehicles equipped with the optional automatic wiper
system.
²Wiper, Turn Signals, Engine Start Control
Module- The wiper, turn signals and engine start
control module is integral to the fuse block located
underneath the steering column. The fuse block is
concealed behind the fuse access panel and the steer-
ing column opening panel, where it is secured with
screws to the steering column. The wiper system
functions of this module are passive on vehicles
equipped with the optional automatic wiper system.
Hard wired circuitry connects the wiper and
washer system components to the electrical system of
the vehicle. These hard wired circuits are integral to
several 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 wiper and washer
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 wiper and washer system is designed to pro-
vide the vehicle operator with a convenient, safe, and
reliable means of maintaining visibility through the
windshield glass. The various components of this sys-
tem are designed to convert electrical energy pro-
duced by the vehicle electrical system into the
mechanical action of the wiper blades to wipe the
outside surface of the glass, as well as into the
hydraulic action of the washer system to apply
washer fluid stored in an on-board reservoir to the
area of the glass to be wiped. When combined, these
components provide the means to effectively main-
tain clear visibility for the vehicle operator by remov-
ing excess accumulations of rain, snow, bugs, mud, or
VAWIPERS/WASHERS 8R - 3

is closed with the wiper system turned Off, the inter-
mittent wipe logic circuitry operates the wiper motor
in the same manner as it does to provide the inter-
mittent wipe mode operation. After the state of the
washer switch changes to open, the intermittent wipe
logic circuitry monitors the wiper motor through the
wiper on-off relay output circuit, which allows it to
monitor the number of wiper blade sweeps. After the
appropriate number of wiper sweeps the intermittent
wipe logic circuitry operates the wiper motor to
return the wipers to their park position, then de-en-
ergizes the wiper relay.
AUTOMATIC WIPE SYSTEM
When the ignition switch is in the On position, bat-
tery current from a fuse in the fuse block underneath
the steering column is provided through a fused igni-
tion switch output (run-start) circuit to the rain sen-
sor control module under the instrument panel, to
the rain sensor within the base of the inside rear
view mirror on the windshield, and to the multi-func-
tion switch. The internal circuitry of the multi-func-
tion switch provides direct hard wired battery
current outputs to the rain sensor control module to
indicate the selected wiper operating mode. The con-
trol module logic monitors the inputs from the multi-
function switch as well as from the rain sensor and
the wiper motor park switch in order to provide the
outputs necessary to operate the wiper motor and the
washer pump motor as requested.
When the automatic wipe position is selected with
the multi-function switch control stalk, the rain sen-
sor control module logic circuitry responds by provid-
ing an acknowledgment sweep of the wipers. The
rain sensor calculates the correct wiper speed and
wiper sweep intervals required to remove the mois-
ture detected on the windshield glass and provides
this input to the rain sensor control module. The con-
trol module then energizes and de-energizes the
wiper motor automatically. The automatic wipe logic
will also provide a wipe-after-wash feature to clear
washer fluid that is directed onto the windshield
when the washer system is utilized.
When the Off position of the multi-function switch
wiper control stalk is selected, one of two events is
possible. The event that will occur depends upon the
position of the wiper blades on the windshield at the
moment that the Off position is selected. If the wiper
blades are in the down position on the windshield
when the Off position is selected, the park switch
that is integral to the wiper motor is closed to
ground, and the rain sensor control module logic cir-
cuit de-energizes the wiper motor. If the wiper blades
are not in the down position at the moment the Off
position is selected, the park switch is an open cir-
cuit. The control module logic circuit directs battery
current to the low speed brush of the wiper motor,
which causes the wiper motor to continue runninguntil the wiper blades are in the down position on
the windshield and the park switch is again closed to
ground.
When the Wash position of the control knob on the
right control stalk of the multi-function switch is
selected with the wiper system turned Off, the rain
sensor control module logic circuitry operates the
wiper motor in the same manner as it does to provide
the automatic wipe mode operation. After the state of
the washer switch changes to open the control mod-
ule monitors the wiper motor through the wiper park
switch sense circuit, which allows it to monitor the
number of wiper blade sweeps. After the appropriate
number of wiper sweeps the control module operates
the wiper motor to return the wipers to their park
position, then de-energizes the wiper motor.
OPERATING MODES
The components of the wiper and washer system
are designed to provide the following operating
modes:
²Automatic Wipe Mode- On vehicles so
equipped, the internal circuitry of the multi-function
switch, the rain sensor control module and the rain
sensor work in concert to provide wiper system oper-
ation automatically whenever moisture is detected on
the windshield glass.
²Continuous Wipe Mode- The two-speed wiper
motor, the internal circuitry of the multi-function
switch, and the wiper system logic circuits work in
concert to provide two continuous wipe cycles, low
speed or high speed.
²Intermittent Wipe Mode- On vehicles so
equipped, the internal circuitry of the multi-function
switch, the intermittent wipe circuitry of the wiper,
turn signals and engine start control module in the
fuse block, and the wiper relay work in concert to
provide an intermittent wipe mode with a single,
fixed delay interval.
²Pulse Wipe Mode- The internal circuitry of
the multi-function switch and the wiper system logic
circuits work in concert to provide a pulse wipe mode
that will allow the wiper motor to be operated for a
single, complete wipe cycle.
²Washer Mode- When the washer system is
activated with the multi-function switch while the
wiper system is operating, washer fluid will be dis-
pensed onto the windshield glass through the washer
nozzles for as long as the washer pump/motor is
energized.
²Wipe-After-Wash Mode- The wiper system
logic circuitry provides a wipe-after-wash feature. If
the wipers are turned Off, this feature will operate
the washer pump/motor and the wipers for as long as
the washer system is activated, then provide several
additional wipe cycles after the washer system is
deactivated before parking the wiper blades near the
base of the windshield.
VAWIPERS/WASHERS 8R - 5

DIAGNOSIS AND TESTING - WIPER &
WASHER SYSTEM
If the wiper motor operates, but the wipers do not
move on the windshield, replace the faulty wiper
linkage module. If the washer pump/motor operates,
but no washer fluid is dispensed on the glass; or, if
the wipers operate, but chatter, lift, or do not clear
the glass, clean and inspect the wiper and washer
system components as required. (Refer to 8 - ELEC-
TRICAL/WIPERS/WASHERS - CLEANING) and
(Refer to 8 - ELECTRICAL/WIPERS/WASHERS -
INSPECTION). For diagnosis and testing of the
multi-function switch (Refer to 8 - ELECTRICAL/
LAMPS/LIGHTING - EXTERIOR/MULTI-FUNC-
TION SWITCH - DIAGNOSIS AND TESTING).
Refer to the appropriate wiring information. The wir-
ing information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
The hard wired circuits and components of the
wiper and washer system may be diagnosed andtested using conventional diagnostic tools and proce-
dures. However, conventional diagnostic methods
may not prove conclusive in the diagnosis of the
intermittent wipe logic circuitry contained within the
fuse block underneath the steering column, the rain
sensor within the base of the rear view mirror on the
windshield, or the rain sensor control module under
the instrument panel.
WARNING: To avoid personal injury or death, on
vehicles equipped with airbags, disable the supple-
mental restraint system before attempting any
steering wheel, steering column, airbag, seat belt
tensioner, or instrument panel component diagno-
sis or service. Disconnect and isolate the battery
negative (ground) cable, then wait two minutes for
the system capacitor to discharge before perform-
ing further diagnosis or service. This is the only
sure way to disable the supplemental restraint sys-
tem. Failure to take the proper precautions could
result in accidental airbag deployment.
INTERMITTENT WIPER SYSTEM
CONDITION POSSIBLE CAUSES CORRECTION
WIPERS INOPERATIVE IN
ALL SWITCH POSITIONS1. Faulty or missing fuse. 1. Test and replace the fuse as required.
2. Faulty wiper motor ground circuit. 2. Test and repair the open ground circuit
as required.
3. Faulty multi-function switch feed
circuit.3. Test and repair the open fused ignition
switch output circuit between the fuse and
the multi-function switch as required.
4. Faulty multi-function switch. 4. Test and replace the multi-function
switch as required.
5. Faulty wiper motor. 5. Test and replace the wiper motor as
required.
WIPERS INOPERATIVE IN
INTERMITTENT POSITION
AND NO WIPE AFTER
WASH FEATURE1. Faulty wiper relay. 1. Test and replace the wiper relay as re-
quired.
2. Faulty multi-function switch. 2. Test and replace the multi-function
switch as required.
3. Faulty intermittent wipe logic cir-
cuit.3. Replace the steering column fuse block
as required.
WIPERS INOPERATIVE IN
LOW POSITION AND NO
PULSE FEATURE1. Faulty low speed circuit. 1. Test and repair the open low speed cir-
cuit between the multi-function switch and
the wiper motor as required.
2. Faulty multi-function switch. 2. Test and replace the multi-function
switch as required.
3. Faulty wiper low speed brush. 3. Test and replace the wiper motor as
required.
8R - 6 WIPERS/WASHERSVA