DIAGNOSIS AND TESTING - WIPER &
WASHER SYSTEM
If the wiper motor oper ates, bu t the wipers do not
move on t he windshield, r eplace the faulty wiper
lin kage module. If th e wash er pump/motor opera tes,
but no wash er fluid is dispensed on th e glass; or, if
the wipers oper ate, but chat ter, lift, or do not clear
the glass, clean and inspect the wiper and washer
system componen ts a s required. (Refer to8-ELEC-
TRICAL/WIP ERS/WASHE RS - CLEANING) a nd
(Refer t o 8 - ELECTRICAL/WIPERS/WASHERS -
INSPECTION). For dia gnosis a nd testing of the
multi-fu nction switch (Refer to 8 - ELECTRICAL/
LAMPS/LIGHTING - E XTERIOR/MULTI-F UNC-
TION SWITCH - DIAGNOSIS AND TE STING).
Refer to th e appropriate wiring infor mation. Th e wir-
ing information includes wirin g diagram s, proper
wire a nd connector repair procedu res, details of wire
harness routing and ret ention, connector pin-out
information and loca tion views for th e various wire
harness connectors, splices an d grounds.
The h ard wir ed circuits and compon ents of t he
wiper and wa sh er system may be diagnosed an d
tested using conventional diagn ost ic t ools a nd proce-
du res. However, conventional diagnostic methods
may not prove conclusive in the diagn osis of th e
intermittent wipe logic circuitr y contained with in t he
fuse block u ndern eath t he steerin g column , th e ra in
sensor wit hin t he base of the rear view mirr or on the
windshield, or th e rain sen sor control m odu le 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 POSITIONS
1. 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 FEATURE
1. 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 FEATURE
1. 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/WASHERS VA
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