ATC Module Messages Not Received

Test 1 - 2:

SYMPTOM
ATC MODULE MESSAGES NOT RECEIVED

WHEN MONITORED
With the ignition in run or run/start.

SET CONDITION
The module does not receive any messages from the ATC module. Time to mature for the BCM, DDM and PDM is 5 seconds. Time to mature for the IPM is 20 seconds.

POSSIBLE CAUSES
- Attempt to communicate with the automatic temperature control module
- Module