Pinpoint Test CE: Abs Module Communication Concern With HVAC Module
Normal Operation and Fault Conditions
With the ignition ON, the HVAC control module sends messages to the GWM over the MS-CAN, The GWM relays these messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a HVAC control module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the HVAC control module, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U0164:00 | Lost Communication With HVAC Control Module: No Sub Type Information | This DTC sets when the ABS module does not receive any messages from the HVAC module within the allowed time. |
| ABS U0424:86 | Invalid Data Received From HVAC Control Module: Signal Invalid | This DTC sets when the ABS module receives messages from the HVAC module, but the messages contain invalid data. |
Possible Sources
- Network communication concern
- GWM
- HVAC control module
Pinpoint Tests CE: ABS Module Communication Concern With HVAC