Flow of Diagnosis

1. Verify the customer's concern by operating the windshield wiper and washer system to duplicate the condition.
2. Inspect to determine if one of the mechanical or electrical concerns apply:

FRONT WINDSHIELD WIPER AND WASHER SYSTEMS

Mechanical
- Windshield wiper blade missing or damaged.
- Binding windshield wiper pivot arm.
- Binding windshield wiper mounting arm and pivot shaft.
- Empty windshield washer reservoir.
- Kinked or broken windshield washer hoses.

Electrical
- Open fuse junction panel Fuses:
+ 8 (5 A)
+ 12 (5 A)
+ 20 (5 A)
+ 23 (6 A)
- Damaged windshield wiper motor.
- Damaged windshield washer pump.
- Open connectors.
- corroded connectors.
- Inoperative multi-function switch.
- Open thermal breaker internal to the wiper motor.

3. Visually inspect the components of the rear windshield wiper system.

REAR WIPER AND WASHER SYSTEMS

Mechanical
- Binding windshield wiper pivot arm.
- Damaged/stripped windshield wiper motor shaft.
- Damaged/stripped windshield wiper pivot arm.
- corrosion.

Electrical
- Open fuse 19 (15 A) in fuse junction panel.
- Damaged rear windshield wiper/washer switch.
- Damaged rear windshield wiper motor.
- Loose or corroded electrical connectors.

4. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
5. If a concern remains after the inspection, use Rotunda New Generation Star (NGS)Tester 007-00500 or equivalent to retrieve Diagnostic Trouble Codes (DTCs) and to execute wiper self test diagnostics for the Generic Electronic Module (GEM) as follows:
6. To perform wiper self-test:

Select GEM-GENERIC ELECTRONIC MODULE.

Press TRIGGER to enter this menu.

At POWER DOOR LOCKS? select the answer applicable to the vehicle being tested by pressing TRIGGER to toggle between YES and NO.

Press SAVE to enter selection.

Select DIAGNOSTIC TEST MODES. Press TRIGGER to enter this menu.

Select WIPER SELF TEST. Press TRIGGER to initiate test.

Press START and follow the instructions on the NGS Tester screen.

7. If wiper self-test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
8. If DTCs are retrieved, go to the GEM DTC Index to continue diagnostics. GEM Diagnostic Trouble Code Index
9. If the GEM cannot be accessed by the NGS, go to Pinpoint Test A. A: No Communication With Generic Electronic Module

Rotunda Service Bay Diagnostic System (SBDS(R)) 001-00001 may also be used to diagnose this system.