DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0155-87: Lost Communication with Instrument Panel Cluster (IPC) Control Module Missing Message [06/2018 - 08/2021]: Procedure

WARNING: This page is about a different car, the 2021 Lexus ES 350, 2021 Lexus ES 250, 2020 Lexus ES 350, and 2019 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTCs

Clear the DTCs.
Body Electrical > Road Sign Assist > Clear DTCs
Make sure that the DTC detection conditions are met.
HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

Check for DTCs.

Body Electrical > Road Sign Assist > Trouble Codes

Result

Result	Proceed to
DTC U0100-87, U0125-87, U0129-87, U0140-87 and U0155-87 are not output	A
DTC U0100-87, U0125-87, U0129-87, U0140-87 or U0155-87 is output	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]

Result:

GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ]