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HVAC Control Module Malfunction

  1. Ignition OFF, disconnect the harness connector C1 at the HVAC control module.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal A12 and ground. => If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Manual HVAC Rear Defog Sw parameter is OFF. => If not the specified value, test the signal circuit terminal A5 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal A5 and ground. Verify the scan tool Manual HVAC Rear Defog Sw parameter is ON. => If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the HVAC control module.
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