The heated rear window operation is controlled by the heated rear window switch located in the HVAC controls under the audio system via the BCM. This is a momentary contact switch, which toggles power on and off when it is pressed. The heating is timed to continue for 15 minutes and every new activation of the heated rear window switch resets the delay timer. Heating of the rear window is only available when the ignition is on, it defaults back to off when the ignition is switced off. Control of the heated rear window is through the defog relay. The defog relay is located on the fuse panel and is connected in parallel with the heated rear window indicator lamp.