Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VKI5
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 11/2017]
Title: LIGHTING (EXT): LIGHTING SYSTEM: B124B; Automatic High Beam System; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

B124B

Automatic High Beam System

DESCRIPTION

The DTC is stored when the main body ECU detects malfunctions in the automatic high beam system.

DTC No.

DTC Detection Condition

Trouble Area

B124B

Malfunction in automatic high beam system
  • Steering angle sensor, VSC system or SFI system
  • Inner rear view mirror assembly

CAUTION / NOTICE / HINT

NOTICE:

First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no CAN communication malfunctions before troubleshooting this symptom.

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: DTC CHECK / CLEAR ).

(b) Check for DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: DTC CHECK / CLEAR ).

OK:

DTC B124B is not output.

OK

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 )
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2.

CHECK FOR DTC

(a) Check for DTCs (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: DTC CHECK / CLEAR ).

Result

Result

Proceed to

DTC B2414 is output

A

DTC B2415 is output

B

DTC U0126, DTC U0129 or DTC U0101 is output

C

Other DTC is not output

D
A

GO TO DTC CHART (DTC B2414)

B

GO TO DTC CHART (DTC B2415)

C

GO TO DTC CHART (DTC U0101, U0126 or U0129)

D

REPLACE INNER REAR VIEW MIRROR ASSEMBLY