Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: 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.

Blind Spot Monitor Master

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 RH
Blind Spot Monitor Slave

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

CAUTION / NOTICE / HINT

NOTICE:

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

    w/ Smart Key System: Click here

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 on the vehicle is correct.

OK:

The part number is correct.

NG

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

OK

2.

CHECK DTC

(a) Clear the DTCs.

Body Electrical > Blind Spot Monitor Master > Clear DTCs Body Electrical > Blind Spot Monitor Slave > Clear DTCs

(b) 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 RH

C

REPLACE BLIND SPOT MONITOR SENSOR LH

    Lost Communication with Blind Spot Monitor Master Module (U0233)

    Clearance Warning Buzzer(for Front)

    See More:

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Hybrid Control System: High Voltage Power Resource Circuit Short during Pre-Charge (P300449)
    DTC SUMMARY MALFUNCTION DESCRIPTION The hybrid vehicle control ECU monitors the high-voltage wiring between the HV battery and inverter with converter assembly and detects an open circuit malfunction. The cause of this malfunction may be one of the following: Inverter voltage sensor (VH) internal ci ...

    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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