Rear Window Defogger Switch

Rear Window Defogger Switch

Description

The switch for the rear window defogger system is located in the Heating, Ventilation and Air Conditioning (HVAC) control in the instrument panel center bezel. When the system is in operation, an amber indicator lamp located in the rear window defogger switch will illuminate.

Operation

When the rear window defogger switch is pressed to the on position, the HVAC control sends a request message to the Totally Integrated Power Module (TIPM) to energize the relay to provide battery current to the rear window defogger grid lines and to the heated side view mirrors, when equipped. An amber indicator will illuminate when the rear window defogger system is activated.

• The rear window defogger system turns off automatically after 10 minutes of initial operation. Each following activation cycle of the rear window defogger system will last 5 minutes.

The rear window defogger system will automatically turn off after an initial programmed time interval of about 10 minutes as long as the ignition switch is in RUN. After the initial time interval has expired, if the rear window defogger switch is pressed to the on position again during the same ignition cycle, the system will automatically turn off after about 5 minutes. The system will also turn off if the ignition switch is turned to any position other than RUN or by manually pressing the rear window defogger switch a second time.

The rear window defogger switch is diagnosed using a scan tool.

The rear window defogger switch and indicator cannot be adjusted or repaired and the HVAC control must be replaced if the rear window defogger switch or indicator lamp is inoperative or damaged.