Rear Window Defogger System Components
The rear window defogger system consist of the following components:
| • | HVAC control module |
| • | REAR DEFOG relay |
| • | Rear window defogger grid |
Rear Window Defogger Operation
Battery positive voltage is supplied through the BATT 2 fuse located in the underhood fuse block to the REAR DEFOG relay coil and switched inputs. When the rear window defogger switch is depressed, the HVAC control module energizes the REAR DEFOG relay by grounding the control circuit. This allows battery positive voltage from the relay switched input through the switch contacts and out the relay switched output to the rear window defogger grid. The HVAC control module also illuminates the rear window defogger indicator upon this request. Ground for the rear window defogger grid is provided by G301.
When you start the engine and depress the rear window defogger switch, the defogger cycle lasts for 10 minutes. Further operation will result in 5 minute defogger cycles.
The rear defogger feature will not time out if vehicle speed is above 48 km/h (30 mph).
If battery voltage is low, the rear defogger feature will be disabled.
