Diagnostic Procedure

VERIFY DTC IS ACTIVE
NOTE: Make sure the IOD fuse is installed and the battery is fully charged before proceeding.
1. Turn the ignition on.
2. With the scan tool, read active DTCs.
  Is this DTC active?
  
  Yes
  - Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Diagnosis and Testing and perform the U0164-Lost Communication with HVAC Control Module.
  No
  - Refer to Non-DTC Diagnostics/Communication - Diagnosis and Testing and perform the Stored Lost Communication DTCs diagnostic procedure.