Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H5VR
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: LIGHTING (EXT): LIGHTING SYSTEM (for HV Model): B124B; Automatic High Beam System; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

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 control system
  • Road sign assist system*
  • Pre-collision system
  • Hybrid control system
  • Electronically controlled brake system
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)

Main Body
  • *: w/ Road Sign Assist System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The lighting system (for HV Model) 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 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

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

    Click here 2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV 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
  • Millimeter wave radar sensor
  • CAN communication system

PROCEDURE

1.

CHECK FOR DTC (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the power 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 control system, road sign assist system* or pre-collision system warning message is displayed on the multi-information display.

Click here 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; CRUISE CONTROL: FRONT CAMERA SYSTEM (for HV Model): DIAGNOSIS SYSTEM

OK:

No dynamic radar cruise control system, lane control system, road sign assist system* or pre-collision system warning messages are displayed.

  • *: w/ Road Sign Assist System
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

NG

GO TO FRONT CAMERA SYSTEM