Rear Window Defogger System Components (w/oCJ2)
The rear window defogger system consist of the following components:
| • | A HVAC control module |
| • | A rear window defogger relay |
| • | A rear window that has a number of grid lines |
| • | Two bus bars that are attached to the inside surface of the rear window |
The battery voltage terminal and ground terminal are soldier to the bus bars.
Rear Window Defogger Operation
Battery positive voltage is supplied through the REAR DEFOG circuit breaker, in the IP fuse block, to the rear window defogger relay switch. With the ignition in the ON position, ignition 3 voltage is supplied through the HVAC fuse, in the IP fuse block, to the HVAC control module and the rear window defogger relay coil. When you depress the rear window defogger switch, the HVAC control module illuminates the rear window defogger indicator and grounds the control circuit of the rear window defogger relay. This energizes the rear window defogger relay and allows battery positive voltage to the rear window defogger grid. Ground for the rear window defogger grid is provided by G301.
When you start the engine and press the rear window defogger switch for the first time, the defogger cycle lasts for 10 minutes. Further operation results in 5 minute defogger cycles. The defogger cycle resets to 10 minutes when you cycle the ignition to the OFF position and then back to the ON position.
Rear Window Defogger System Components (w/CJ2)
The rear window defogger system consist of the following components:
| • | A HVAC control module |
| • | A rear window defogger relay |
| • | A rear window that has a number of grid lines |
| • | Two bus bars that are attached to the inside surface of the rear window. |
The battery voltage terminal and ground terminal are soldier to the bus bars.
Rear Window Defogger Operation
Battery positive voltage is supplied through the REAR DEFOG circuit breaker, in the IP fuse block, to the rear window defogger relay switch. With the ignition in the ON position, ignition 3 voltage is supplied through the HVAC fuse, in the fuse block, to the HVAC control module and the rear window defogger relay coil. When you depress the rear window defogger switch, the HVAC control module illuminates the rear window defogger indicator and grounds the control circuit of the rear window defogger relay. This energizes the rear window defogger relay and allows battery positive voltage to the rear window defogger grid. Ground for the rear window defogger grid is provided by G301.
When you start the engine and press the rear window defogger switch for the first time, the defogger cycle lasts for 15 minutes. Further operation results in 7.5 minute defogger cycles. The defogger cycle resets to 15 minutes when you cycle the ignition to the OFF position and then back to the ON position.
