Pinpoint Test BM: PSCM (Power Steering Control Module) DTC (Diagnostic Trouble Code) U0553:00 Invalid Data Received From Lighting Control Module- Rear B
Refer to POWER STEERING CONTROLS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Power Steering - System Operation and Component Description .
- Description
- The PSCM monitors the MS-CAN when the voltage to the PSCM is greater than 10 volts and there are no Diagnostic Trouble Codes (DTCs) present inhibiting PSCM operation.
- Pinpoint Test Applicability
- This test applies to PSCM DTC U0553 Invalid Data Received from the LCM - Rear "B" only. It does not apply to any other module except the PSCM.
- DTC Diagnostic Strategy
- If the module DTC list results in a large number of Diagnostic Trouble Codes (DTCs), diagnose all module hard faults first (C102D, C1B00, C200B, C200C, C200D, U2011 and U3000) before diagnosing any network faults (lost communication or invalid data). If voltage concern Diagnostic Trouble Codes (DTCs) are present, diagnose those after any module hard faults and before any network faults. Diagnose all current and active Diagnostic Trouble Codes (DTCs) before diagnosing any historic Diagnostic Trouble Codes (DTCs).
- Pinpoint Test Purpose
- To direct the diagnosis to the module and associated circuit sending the faulty or unknown information in the messages.
- Diagnostic Aids
- For additional information on the messages sent to the PSCM from the LCM - Rear "B" module, refer to the Network Message Chart .
- DTC U0553:00 indicates a concern with the information sent from the LCM - Rear "B". The module reporting this DTC is not the problem module. Do not install a new PSCM as part of the repair for PSCM DTC U0553:00.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PSCM U0553:00 | Invalid Data Received From Lighting Control Module-Rear "B": No Sub Type Information | This DTC is set if the PSCM receives an "fault" or "unknown" message from the LCM - Rear "B" instead of valid information. |
Possible Sources
- MS-CAN concern
- LCM - Rear "B"
- This DTC sets when the PSCM does not receive the LCM - Rear "B" messages within a certain time frame. This can occur if the LCM - Rear "B" wiring harness or electrical connectors are loose or damaged, or if the vehicle battery state of charge levels are low. Consult the DTC Index for additional information if needed.