Toyota CH-R Service Manual: Software Incompatibility with Body Control Module "B" (U1331)

Toyota CH-R Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / Software Incompatibility with Body Control Module "B" (U1331)

DESCRIPTION

This DTC is stored when the destination information of the main body ECU (multiplex network body ECU) does not match that of the blind spot monitor sensors.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U1331

Software Incompatibility with Body Control Module "B"

Destination information of the main body ECU and blind spot monitor sensor do not match
  • Main body ECU (multiplex network body ECU)
  • Blind spot monitor sensor LH (Slave)
  • Blind spot monitor sensor RH (Slave)

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is turned on.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration*1.

    Click here

    *1: w/ Smart Key System

PROCEDURE

1.

CONFIRM PART NUMBER (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Check the main body ECU (multiplex network body ECU) part number.

(1) Check if the part number of the main body ECU (multiplex network body ECU) installed to the vehicle is correct.

OK:

The part number is correct.

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

2.

CHECK DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON.

(c) Recheck for DTCs and check if the same DTC is output again.

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

Result

Proceed to

No DTCs are output.

A

DTC U1331 is output ("Blind Spot Monitor Master").

B

DTC U1331 is output ("Blind Spot Monitor Slave").

C
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BLIND SPOT MONITOR SENSOR LH (MASTER)

C

REPLACE BLIND SPOT MONITOR SENSOR RH (SLAVE)

    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. ...

    Short to GND or Open in Buzzer (C1ABE)
    DESCRIPTION DTC C1ABE is stored when the blind spot monitor sensor RH (Slave) detects a short to ground or open in the RCTA buzzer (blind spot monitor buzzer) circuit. ...

    Other materials:

    Toyota CH-R Service Manual > Windshield Deicer System: Terminals Of Ecu
    TERMINALS OF ECU CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY (for TMMT Made) (a) Disconnect the F72 air conditioning amplifier assembly connector. (b) Measure the voltage and resistance according to the value(s) in the table below. Tester Connection Wiring Color ...

    Toyota CH-R Service Manual > Navigation System: Cursor or Map Rotates when Vehicle Stopped
    PROCEDURE 1. CHECK CONDITION (a) Check with the customer if the vehicle has been turned by a turntable. OK: Vehicle has not been turned by a turntable. HINT: If the vehicle is turned on a turntable with the engine switch on (IG), the syst ...

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

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2026 Copyright www.tochr.net
    0.0112