Body Control Module
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
- Rear Defog Relay
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The scan tool displays On/Off. When the rear window defogger switch is depressed, the body control module energizes the Rear Window Defogger relay by grounding the control circuit of the relay, which the scan tool displays as On.