Scan Tool Data Definitions for GMC Truck Yukon - 2WD 2005

Body Control Module (BCM)

Rear Defog Relay: When the BCM energizes the RR DEFOG relay, the scan tool will display On. When the BCM de-energizes the RR DEFOG relay, the scan tool will display Off.

Rear Defrost Switch: When rear defrost switch is pressed the scan tool displays On.