Toyota CH-R Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0142)

Toyota CH-R Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0142)

DESCRIPTION

These DTCs are stored if there is a malfunction in the CAN communication system connected to the blind spot monitor sensor.

HINT:

If CAN communication system DTCs are stored, they may also be stored for other systems.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
U0100	Lost Communication with ECM / PCM "A"	Lost communication with ECM	CAN communication system
U0125	Lost Communication with Yaw Rate Sensor Module	Lost communication with airbag sensor assembly	CAN communication system
U0126	Lost Communication with Steering Angle Sensor Module	Lost communication with steering sensor	CAN communication system
U0129	Lost Communication with Brake System Control Module	Lost communication with brake system	CAN communication system
U0142	Lost Communication with Body Control Module "B"	Lost communication with main body ECU	CAN communication system

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.

PROCEDURE

CHECK DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON.

Body Electrical > Blind Spot Monitor Master > Trouble Codes Body Electrical > Blind Spot Monitor Slave > Trouble Codes

Result	Proceed to
DTCs are output.	A
No DTCs are output.	B

HINT:

If CAN communication system DTCs are stored, they may also be stored for other systems.
If the CAN communication system has been inspected and repaired, the DTCs will not be output when rechecking for DTCs.
If these DTCs are output frequently, duplicate the conditions that cause the problem symptoms and perform the inspection again, even if the DTCs were not output when rechecking for DTCs.
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GO TO CAN COMMUNICATION SYSTEM

USE SIMULATION METHOD TO CHECK

Slave Module Horizontal Axis Misalignment (C1AC2)

DESCRIPTION This DTC is stored when the angle of the blind spot monitor sensor RH (Slave) deviates more than the allowable range from the horizontal axis. HINT: If a drum tester such as a ...

Lost Communication with Blind Spot Monitor Slave Module (U0232)

DESCRIPTION This DTC is stored when the blind spot monitor sensor LH (Master) judges that there is a communication problem with the blind spot monitor sensor RH (Slave). DTC No. ...

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Toyota CH-R Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129,U0142)

Slave Module Horizontal Axis Misalignment (C1AC2)

Lost Communication with Blind Spot Monitor Slave Module (U0232)

Other materials:

Toyota C-HR (AX20) 2023-2026 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual