Test H: The Defrost System Will Not Shut Off Automatically
PINPOINT TEST H: THE DEFROST SYSTEM WILL NOT SHUT OFF AUTOMATICALLYNormal Operation
Under normal operation, when the rear window defrost switch is depressed on the HVAC module, a signal is sent to the instrument cluster (IC) through circuit 1010 (DB/OG). Once the IC receives the signal to turn on the rear window defrost, the IC grounds circuit 1009 (OG/YE) to activate the heated rear window relay. Power is then sent to the rear window defrost grid through circuit 186 (BN/LB) from the heated rear window relay. The rear window defrost grid then receives ground through circuit 57 (BK) to chassis ground.
- DTC B1345 Heated Backlite Input Circuit Short To Ground - Heated backlite switch input short to ground
This pinpoint test is intended to diagnose the following:
- Heated rear window relay
- Wiring, terminals or connectors
- HVAC module
- IC
H1-H4:
H4-H6:
H6 Continued:
