Diagnostic Test
VERIFY THE DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE
NOTE:
Make sure the IOD fuse is installed and the battery is fully charged before proceeding.
- Turn the ignition on.
- With the scan tool, read active DTCs.
Is this DTC active?
Yes
- Refer to the DIAGNOSTIC CODE INDEX and perform the U0164-Lost Communication with HVAC Control Module diagnostic procedure.
No
- Refer to the DIAGNOSIS AND TESTING and perform the Stored Lost Communication DTCs diagnostic procedure.