Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
Link:
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Scan Tool Data Definitions - Body Control Module (BCM)
Rear Defog Output: The scan tool displays On/Off. When the rear window defogger switch is depressed, the HVAC control module sends a class 2 message to the BCM to enable the
rear defogger relay. The BCM energizes the rear defogger relay by grounding the control circuit of the rear defogger relay, which the scan tool displays as On.