Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test BQ: Abs (Anti-Lock Brake System) Module Communication Concern With The IPMA (Image Processing Module A): Notes
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 .
The IPMA is part of the Advanced Driver Assistance System (ADAS).
With the ignition ON, the IPMA sends messages to the ABS module the over the FD-CAN. If the ABS module does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). This can be due to an IPMA failure, a circuit failure on the network or an excessive load on the network.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U023A:00 | Lost Communication With Image Processing Module A: No Sub Type Information | Sets when the ABS module does not receive messages from the IPMA. |
| ABS U053B:00 | Invalid Data Received From Image Processing Module A: No Sub Type Information | Sets when the counter signal value in the adaptive cruise control data message from the IPMA does not increase. |
Possible Sources
- Wiring, terminals or connectors
- Network communication concern
- IPMA
- ABS module
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.