Test F: The Defrost System Will Not Shut Off Automatically
PINPOINT TEST F: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLYNormal Operation
The heated rear window is controlled by the HVAC module. The ignition switch must be in RUN for the rear window defrost system to operate. When the rear window defrost button is pressed, the HVAC provides a ground for the rear window defrost relay coil through circuit 688 (GY/LB). The rear window defrost relay coil is energized, providing battery voltage to the antenna module on circuit 186 (BN/LB). The antenna module then supplies voltage and ground to the heated rear window grid.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Heated rear window relay
- HVAC module
F1:
F2:
F3:
