DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [09/2023 - ]: Procedure
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
- CLEAR DTC AND PERFORM ROAD TEST
- Clear the DTCs.
Powertrain > Transmission > Clear DTCs
- Turn the ignition switch to ON (READY) and drive the vehicle at a low speed.
Result
Proceed to NEXT
Result:
NEXT
See step 2
- Clear the DTCs.
- CHECK DTC OUTPUT (DTC U0129-87)
- Read the DTCs using the GTS.
Powertrain > Transmission > Trouble Codes
Result
Result Proceed to U0129-87 is output A U0129-87 is not output B
Result:
A
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]
Result:
B
CHECK FOR INTERMITTENT PROBLEMS
Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ]
Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]
- Read the DTCs using the GTS.