Lexus NX manuals

Lexus NX: Software Incompatibility with Body Control Module "B" (U1331)

Lexus NX Service Manual / Audio & Visual & Telematics / 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

Note

U1331

Software Incompatibility with Body Control Module "B"

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

-

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor main switch (combination switch assembly) is on.
  • Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
  • If the main body ECU (multiplex network body ECU) is replaced, refer to Registration.

    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.

Click here

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.

Click here

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

Result

Proceed to

DTC U1331 is not output

A

DTC U1331 is output from the blind spot monitor sensor LH (Master)

B

DTC U1331 is output from the blind spot monitor sensor RH (Slave)

C
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BLIND SPOT MONITOR SENSOR LH

C

REPLACE BLIND SPOT MONITOR SENSOR RH

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