FCM, HVAC Communication Fault

Tests 1 - 2:

SYMPTOM
FCM, HVAC COMMUNICATION FAULT

WHEN MONITORED
With the ignition in run, and the IOD fuse installed.

SET CONDITION
The FCM does not receive any messages from the Automatic Temperature Control (ATC) module or the A/C Heater Control (MTC) for at least 20 seconds.

POSSIBLE CAUSES
- Attempt to communicate with the HVAC
- Front control module