Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001AYCG
Model Year Start: 2019 Model: Avalon Prod Date Range: [04/2018 - 08/2021]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without Cornering Light): B124B; Automatic High Beam System; 2019 - 2021 MY Avalon [04/2018 - 08/2021]

DTC

B124B

Automatic High Beam System

DESCRIPTION

The main body ECU (multiplex network body ECU) determines the status of the automatic high beam system based on the automatic high beam system signal from the forward recognition camera.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B124B

Automatic High Beam System

Malfunction in automatic high beam system
  • Front camera system
  • Dynamic radar cruise control system
  • Lane departure alert system
  • Pre-collision system
  • SFI system
  • Electronically controlled brake system
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)

Main Body

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The lighting system (for Gasoline Model without Cornering Light) uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the automatic high beam system after confirming that the communication systems are functioning properly.

    Click here 2019 - 2021 MY Avalon [04/2018 - 08/2021]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without Cornering Light): HOW TO PROCEED WITH TROUBLESHOOTING

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here 2019 - 2020 MY Avalon [04/2018 - 08/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Avalon [08/2020 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

HINT:

If the forward recognition camera stores a DTC for a malfunction of any of the following, this DTC will be stored simultaneously.

  • Speed sensor
  • Yaw rate sensor
  • CAN communication system

PROCEDURE

1.

CHECK FOR DTC (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: System Select / Health Check.

(e) Check for DTCs.

Result

Proceed to

Only DTC B124B is output

A

DTC B124B and other DTCs are output

B
B

GO TO OTHER DTC CHART
A

2.

CHECK FRONT CAMERA SYSTEM

(a) Check if a dynamic radar cruise control system, lane departure alert system or pre-collision system warning message is displayed on the multi-information display.

Click here 2019 - 2021 MY Avalon [04/2018 - 08/2021]; CRUISE CONTROL: FRONT CAMERA SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

OK:

No dynamic radar cruise control system, lane departure alert system and pre-collision system warning messages are displayed.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

GO TO FRONT CAMERA SYSTEM