Heated Glass Element Switch: Testing and Inspection

REAR WINDOW DEFOGGER SWITCH

The rear window defogger switch and timer circuit may be tested in the vehicle with or without the scan tool.

TESTING WITH SCAN TOOL

Using a scan tool, refer to the proper diagnostic procedures section.

TESTING WITHOUT SCAN TOOL

NOTE: For circuit descriptions and diagrams of the rear window defogger (EBL) system, refer to WIRING DIAGRAM INFORMATION.




1. Remove the A/C-heater control from the instrument panel.

2. Using a ohmmeter, check for continuity between the ground circuit cavity of the defogger switch wire harness connector and a good ground. There should be continuity. If OK, go to STEP 3. If not OK, repair the open circuit as required.

3. Check for continuity between the ground circuit terminal and the rear window defogger relay output terminal (3) on the back of the A/C-heater control. There should be momentary continuity as the defogger switch is pressed, and then no continuity. If OK, refer to Heated Seat testing. If not OK, replace the inoperative A/C-heater control.