Diagnosis And Testing - Wiper And Washer System
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 Intelligent Battery Sensor (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.
If the wiper motor operates but the wiper blades do not move on the windshield, verify that the arms are properly tightened to the pivot shaft(s). If the problem continues, replace the ineffective wiper motor or wiper linkage module. If the washer pump operates but no washer fluid is dispensed on the glass, verify the nozzles are not blocked and the hoses are not pinched or kinked. If the problem continues, replace the washer pump. If the wipers operate but chatter, lift, or do not clear the glass, clean and inspect the wiper arms and blades for physical damage and replace damaged part(s). and. Refer to CLEANING . Refer to INSPECTION .
The hardwired 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, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds. For proper wire repair, and connector repair procedures. Refer to STANDARD PROCEDURE . and. Refer to REMOVAL . Refer to INSTALLATION .
However, conventional diagnostic methods will not prove conclusive in the diagnosis of the wiper and washer system or the electronic controls and communication between other modules and devices that provide some features of the wiper and washer system. The most reliable, efficient and accurate means to diagnose the wiper and washer system or the electronic controls and communication related to wiper and washer system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
| FRONT 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 low speed and high speed feed circuits between Body Control Module (BCM) and wiper motor as required. | |
| 3. Ineffective right multifunction switch. | 3. Test and replace the Steering Column Control Module (SCCM), if required. | |
| 4. Ineffective BCM inputs or outputs. | 4. Use a diagnostic scan tool for additional testing of the BCM. Refer to the appropriate diagnostic information. | |
| 5. Ineffective wiper motor. | 5. Test and replace open or shorted wiper motor as required. | |
| WIPER MOTOR OPERATES SLOWLY IN ALL SWITCH POSITIONS | 1. Ineffective wiper motor. | 1. Check amperage draw with linkage disconnected from 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 low and high speed feed circuits, if required. | |
| 3. Amperage draw too high. | 3. With linkage disconnected from wiper motor output shaft, check linkage and pivots for binding. If binding is detected, repair or replace wiper linkage module, if required. If no linkage binding detected, replace the wiper motor, if required. | |
| WIPERS RUN AT HIGH SPEED WITH SWITCH LOW SPEED SELECTED OR AT LOW SPEED WITH SWITCH HIGH SPEED SELECTED | 1. Ineffective motor feed circuit wiring. | 1. Test and repair low speed and high speed feed circuits between BCM and 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 circuits between BCM and washer pump, if required. | |
| 3. Ineffective right multifunction switch. | 3. Test and replace the SCCM, if required. | |
| 4. Ineffective BCM inputs or outputs. | 4. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information. | |
| 5. Ineffective washer pump. | 5. Test and replace open or shorted washer pump, if required. | |