Initial Inspection and Diagnostic Overview

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

NOTE: The CTM must be reconfigured upon replacement. Refer to the scan tool help screen on the configuration card to program the tire size and axle ratio.

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







VISUAL INSPECTION CHART

4. If the concern remains after the inspection, connect scan tool to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the scan tool menu. If the scan tool 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 the scan tool still does not communicate with the vehicle, refer to the scan tool manual.
6. Perform the DATA LINK DIAGNOSTIC TEST. Pinpoint Test PC (Precheck)
If the scan tool responds with:
^ CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer Module Communications Network (Information Bus).
^ NO RESPONSE/NOT EQUIPPED for GEM/CTM, go to Pinpoint Test M. Test M: No Communication With the Module - GEM/CTM Modules
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform front and rear wiper self-test diagnostics for the GEM/CTM.
7. If the DTCs retrieved are related to the concern, go to GEM/CTM Diagnostic Trouble Code (DTC) Reference Chart to continue diagnostics. GEM/CTM Diagnostic Trouble Code (DTC) Index
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Testing and Inspection