Flow of Diagnosis

1. The wiper washer system is a Generic Electronic Module (GEM)/Central Timer Module (CTM) controlled system.

NOTE: The GEM/CTM must be reconfigured upon replacement. Refer to the New Generation STAR (NGS) Tester help screen on the configuration card to program tire size and axle ratio.

2. Verify the customer concern by operating the system in question.
3. Visually inspect for the following obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Switch(es)
^ Wiper arms
^ Wiper mechanism

Electrical
^ Fuse(s)
^ Damaged wiring harness
^ Loose or corroded connections
^ Lamps
^ Circuitry

4. If the concern remains after the inspection connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
^ check that the program card is properly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.

5. If NGS still does not communicate with the vehicle, refer to the NGS Tester manual.
6. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT914, CKT915 or CKT70=ALL ECUS NO RES P/NOT EQUIP, refer to Information Bus.
^ NO RESPONSE/NOT EQUIPPED for GEM/CTM, go to Pinpoint Test H. H: No Communication With the Module-GEM/CTM
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform wiper/washer self-test diagnostics for the GEM/CTM.
7. If the DTCs retrieved are related to the concern, go to GEM/CTM DTC Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures