Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001EPCF
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 02/2019]
Title: LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): B124B; Automatic High Beam System; 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]

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

Note

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
  • SFI system
  • Electronically controlled brake system
  • CAN communication system
  • Forward recognition camera
  • Main body ECU (multiplex network body ECU)

Main body ECU (multiplex network body ECU)

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The lighting system (w/o Headlight ECU) 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 MY RAV4 RAV4 HV [11/2018 - 02/2019]; LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): HOW TO PROCEED WITH TROUBLESHOOTING

  • w/ Smart Key System:

    Before replacing the main body ECU (multiplex network body ECU), refer to 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
  • Steering sensor
  • CAN communication system

PROCEDURE

1.

CHECK FOR DTC (HEALTH CHECK)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; CRUISE CONTROL: FRONT CAMERA SYSTEM: DIAGNOSIS SYSTEM

OK:

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

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

GO TO FRONT CAMERA SYSTEM