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Diagnosis flow code: I

Step Action Yes No
1  Power and ground circuit check of HVAC control module 
  1. Check HVAC control module power and ground circuits.

Is it in good condition? 		 Go to Step 2. Repair power and/or ground circuit.
2  CAN communication circuit check 
  1. Turn ignition switch to OFF position.
  2. Disconnect connector from HVAC control module and BCM.
  3. Check for proper terminal connection to CAN communication circuit at HVAC control module and BCM connectors.
  4. If OK, check CAN communication circuits between HVAC control module connector and BCM connector for breaking.

Is each CAN communication circuit in good condition? 		 Substitute a known-good HVAC control module and recheck. Repair CAN communication circuit.
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