LS2 V6-3.0L VIN R (2000)
Diagnostic Chart 6
Schematic
CIRCUIT DESCRIPTION
When the rear defrost input circuit 292 to the BCM (Body Control Module) is momentarily switched to ground (as when the rear defrost switch is
pressed), the BCM will respond by grounding circuit 193, the coil of the rear defrost relay.
This action energized the rear defrost relay providing power to circuit 293-rear defrost heater elements, circuit 683-heated mirror relay coil and circuit
683-rear defrost LED telltale. Momentarily switching circuit 292 to ground again will result in the BCM turning the rear defrost relay "OFF".
The first time in an ignition cycle that the rear defrost is activated, rear defrost will remain "ON" for 15 minutes or until the ignition switch is turned