DTC B124B: Automatic High Beam System [12/2021 - 11/2024]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: System Select / Health Check.
5. Check for DTCs.

   Result

   Result	Proceed to
   Only DTC B124B is output	A
   DTC B124B and other DTCs are output	B

Result: 

B 

GO TO OTHER DTC CHART 

Result: 

A 

See step  2

1. Check if a dynamic radar cruise control system, lane control system and pre-collision system warning message is displayed on the combination meter assembly.

   Refer to DIAGNOSIS SYSTEM [12/2021 - ]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result: 

NG 

GO TO FRONT CAMERA SYSTEM 

Refer to PROBLEM SYMPTOMS TABLE [12/2021 - 10/2022] , or refer to PROBLEM SYMPTOMS TABLE [10/2022 - ]