Normal Operation and Fault Conditions

With the ignition ON, the FCIM sends messages to the ABS module through the GWM over the HS-CAN3. If the ABS module does not receive these messages within a certain time frame, the module sets DTCs. For information on the messages sent to the ABS module by the FCIM module, refer to the

NOTE: The HVAC is also known as the FCIM.

PPT CE ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
U0164:87	Lost Communication With HVAC Control Module: Missing Message	This DTC sets when the ABS module does not receive the selectable drive mode messages from the HVAC module in the alloted time. This can be due to a HVAC module failure, a circuit failure on the network or an excessive load on the network.
U0424:00	Invalid Data Received From HVAC Control Module: No Sub Type Information	This DTC sets in the ABS module when the auto hold swtich status message of 'faulty' is received from the HVAC module.