Diagnostic Test

1) VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes
1. Go to step 2).
No
1. Refer to *STORED LOST COMMUNICATION DTCS .
2. Perform BODY VERIFICATION TEST - VER 1 .
2) CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
With the scan tool, read active DTCs from all modules.

NOTE: Check for TIPM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes
1. Diagnose and repair affected DTC.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to step 3).
3) VERIFY THAT THE HVAC IS ACTIVE ON THE BUS
Turn the ignition on.

With the scan tool, select ECU View.

Verify that the HVAC is active on the bus.

Is the HVAC active on the bus?

Yes
1. Go to step 4).
No
1. Refer to *NO RESPONSE FROM HVAC (A/C HEATER CONTROL - ATC) for a no response test procedure.
2. Perform BODY VERIFICATION TEST - VER 1 .
4) CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
With the scan tool, select Network View and select Advanced.

Is there more than one module with active DTCs "Logged Against" the HVAC?

Yes
1. Replace/update the A/C Heater Control in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace/update the module that set the DTC in accordance with the service information
2. Perform BODY VERIFICATION TEST - VER 1 .