HVAC No Comms
Disconnected HVAC plug:
- Measure ground path quality (resistance -ohm ) between a chassis ground and C1 and D1
- Measure Voltage between battery negative and these pins : C5, C10, C12, C16
Connect the HVAC plug and measure the same voltages again with module - Measure Voltage between battery negative and these pins : C5, C10, C12, C16
May Rob has some more info/advice to add
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