Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJB5
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U1331; Software Incompatibility with Body Control Module "B"; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

U1331

Software Incompatibility with Body Control Module "B"

DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

U1331

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

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor main switch (warning canceling switch assembly) is on.

PROCEDURE

1.

CONFIRM PART NUMBER (MAIN BODY ECU)

(a) Check the main body ECU part number.

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

OK:

The parts number is correct.

NG

REPLACE MAIN BODY ECU

OK

2.

CHECK DTC

(a) Clear the DTCs (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DTC CHECK / CLEAR ).

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

Result

Result

Proceed to

No DTC is output

A

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

B

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

C
A

USE SIMULATION METHOD TO CHECK

(See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING 2017 MY Sienna [08/2016 - 11/2017]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING )
B

REPLACE BLIND SPOT MONITOR SENSOR RH

C

REPLACE BLIND SPOT MONITOR SENSOR LH