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 Be: Can Bus Failure: Notes
Refer to appropriate Supplemental Restraint System in OEM Wiring Diagrams article, for schematic and connector information.
Normal Operation and Fault Conditions
The RCM communicates with other modules on the HS-CAN. When the ignition is first turned ON, the RCM will attempt to initialize itself on the HS-CAN.
If the RCM cannot initialize on the HS-CAN, or if it cannot communicate with any other module, the RCM stores DTC U0001:88 or U1A14:55 in memory and sends a message to the IPC to illuminate the airbag warning indicator.
PPT BE RCM DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0001:88 | High Speed CAN Communication Bus: Bus Off | Sets when the RCM cannot communicate on the HS-CAN with any module. |
| U1A14:55 | CAN Initialisation Failure: Not Configured | Sets when the RCM cannot initialize on the HSCAN when the module receives ignition voltage. |
Possible Causes
- Wiring, terminals or connectors
- RCM
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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.
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