Pinpoint Test DA: SASM (Steering Angle Sensor Module) Communication Concern With The AHCM (Auxiliary Heater Control Module): Notes
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
With the ignition ON, the AHCM sends messages to the GWM over the MS-CAN, the GWM relays the messages to the SASM over the HS-CAN2. If the SASM does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). This can be due to a AHCM failure, a circuit failure on the CAN network or an excessive load on the network.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| SASM U0425:00 | Invalid Data Received From Auxiliary Heater Control Module: No Sub Type Information | Sets when the SASM does not receive any data messages from the AHCM within the allotted time. |
Possible Sources
- Wiring, terminals or connectors
- Network communication concern
- AHCM