Normal Operation and Fault Conditions
With the ignition ON, the APIM sends messages to the SASM through the GWM and over the HS-CAN 2. If the SASM does not receive these messages within a certain time frame (usually less than 1 second), the SASM sets DTCs. For information on the messages sent to the SASM by the APIM, refer to the NETWORK MESSAGE CHART in Description and Operation of Anti-Lock Brake System (ABS) and Stability Control article.
PPT BC SASM DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0253:00 | Lost Communication With Accessory Protocol Interface Module: No Sub Type Information | Sets in continuous memory and on-demand when the SASM detects any of the APIM messages are missing. This can be due to a APIM failure, a circuit failure on the HSCAN or an excessive load on the network. |