Diagnosis And Testing - Rear Wiper And Washer System

WARNING: This page is about a different variant/trim than selected.

WARNING:

To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbags, airbag curtains, knee blocker, seat belt tensioner, impact sensor or instrument panel component diagnosis or service. Disconnect the IBS/negative battery cable assembly from the negative battery post, 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 SRS. Failure to take the proper precautions could result in accidental airbag deployment.

WARNING:

On vehicles equipped with the high voltage system, disconnecting the 12-volt battery negative cable alone will not power down the 12-volt system. You must perform the 12-volt Power Down procedure before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.

If the rear wiper motor operates, but the wiper motor output shaft does not move, replace the ineffective rear wiper motor. If the washer pump/motor operates, but no washer fluid is dispensed on the glass; or, if the wiper operates, but chatters, lifts, or does not clear the glass, clean and inspect the rear wiper and washer system components as required. Refer to CLEANING and INSPECTION .

The hard wired rear wiper and washer system circuits and components may be diagnosed 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 will not prove conclusive in the diagnosis of the electronic controls and communication between other modules and devices that provide some features of the rear wiper and washer system. The most reliable, efficient and accurate means to diagnose the rear wiper and washer system or the electronic controls and communication related to rear wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.

REAR WIPER AND WASHER SYSTEM DIAGNOSIS
CONDITION	POSSIBLE CAUSES	CORRECTION
WIPER MOTOR DOES NOT OPERATE IN ANY SWITCH POSITION	1. Ineffective motor ground circuit.	1. Test and repair open wiper motor ground circuit if required.
	2. Ineffective motor feed circuits.	2. Test and repair motor feed circuit between Body Control Module (BCM) and rear wiper motor if required.
	3. Ineffective right multifunction switch.	3. Test and replace the clockspring and stalk unit if required.
	4. Ineffective BCM inputs or outputs.	4. Use a diagnostic scan tool for further testing of the BCM inputs and outputs. Refer to the appropriate diagnostic information.
	5. Ineffective wiper motor.	5. Test and replace open or shorted wiper motor if required.
WIPER DOES NOT PARK CORRECTLY	1. Ineffective wiper motor park switch input circuit.	1. Test and repair wiper park switch input circuit between BCM and rear wiper motor if required.
	2. Ineffective BCM inputs or outputs.	2. Use a diagnostic scan tool for further testing of the BCM. Refer to the appropriate diagnostic information.
	3. Ineffective wiper motor park switch.	3. Test and replace ineffective wiper motor if required.
WIPER MOTOR OPERATES SLOWLY	1. Ineffective wiper motor.	1. Check amperage draw with wiper arm disconnected from rear wiper motor output shaft. Correct draw should be about 6 amperes. If incorrect, refer to the appropriate Possible Cause that follows:
	2. Amperage draw too low.	2. Test and repair shorted rear wiper motor signal and fused ignition switch output (run - accessory) circuits if required.
	3. Amperage draw too high.	3. With wiper arm disconnected from wiper motor output shaft check for binding between output shaft and motor output shaft housing. If binding is detected, lubricate if required. If no binding is detected, replace the wiper motor if required.
WASHER PUMP DOES NOT OPERATE	1. Ineffective washer pump ground circuit.	1. Test and repair open washer pump ground circuit if required.
	2. Ineffective washer pump feed circuit.	2. Test and repair washer pump feed circuit between BCM and washer pump if required.
	3. Ineffective right multifunction switch.	3. Test and replace the clockspring and stalk unit if required.
	4. Ineffective BCM inputs or outputs.	4. Use a diagnostic scan tool for further testing of the BCM. Refer to the appropriate diagnostic information.
	5. Ineffective washer pump.	5. Test and replace open or shorted washer pump if required.