DIAGNOSIS AND TESTING
REAR WIPER & WASHER SYSTEM
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment, pos-
sible personal injury or death.
If the rear wiper motor operates, but the wipers do not move on the windshield or the rear glass, replace the faulty
rear wiper module. If the washer pump operates, but no washer fluid is dispensed on the rear glass; or, if the wipers
operate, but chatter, lift, or do not clear the glass, clean and inspect the rear wiper and washer system components
as required (Refer to 8 - ELECTRICAL/FRONT WIPERS/WASHERS - CLEANING) and (Refer to 8 - ELECTRICAL/
FRONT WIPERS/WASHERS - INSPECTION).
The hard wired wiper and washer system circuits and components may be diagnosed and tested using conventional
diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring 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.
However, conventional diagnostic methods may not prove conclusive in the diagnosis of the steering control module
(SCM), front control module (FCM), integrated power module (IPM), junction block (JB), controller area network
(CAN) data bus, or the electronic message inputs or outputs used to provide wiper and washer system service or
many of the electronic features of the rear wiper and washer system. The most reliable, efficient, and accurate
means to diagnose the SCM, FCM, IPM, JB, CAN data bus and the electronic message inputs and outputs for the
rear wiper and washer system requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic
information.
REAR WASHER HOSES/TUBES
DESCRIPTION
The rear washer plumbing consists of small diameter
rubber hoses and molded plastic in-line connector fit-
tings. The rear washer reservoir hose (1) is connected
to the rear washer barbed outlet nipple of the wind-
shield washer pump below the left front wheel house
extension and routed up along the left inner fender to
the engine compartment. Just forward of the dash
panel (3) in the engine compartment, an in-line con-
nector with barbed nipples joins the rear washer hose
to the A-pillar hose (2).
8R - 66
REAR WIPERS/WASHERS - SERVICE INFORMATION
WK