Orlando

Rear Window Defogger Description and Operation

The rear window demister system consists of the following components:

The rear demist control system utilises a single zone backlight design, driven with a single relay configuration. Additionally, up to two outside rear view mirrors can be heated if required. A switch for the customer to control the system is provided within the HVAC control head. Also included in the HVAC control head is an indicator to inform the customer with the current state of the system. The system is only operational when engine is running or during remote start.

Pressing the heated rear window switch on the HVAC control face plate causes the HVAC control head to send a serial data message to the HVAC control module requesting rear window demist operation. The HVAC control module upon receipt of the serial data message will provide voltage to the coil side of the rear window demister relay, this will energise the relay causing the relay switch contacts to close allowing B+ voltage to flow through the rear demister grid control circuit to the rear demister grid.

When the rear heated window switch is pressed and the engine is running, the rear demist control system will remain active for 10 minutes. After the initial cycle has lapsed, pressing the switch again will continue rear window demister operation, but the cycle will only last 5 minutes. The rear demist control system will function continuously if the vehicle speed is greater than 70 kilometres per hour (45 mph).