DTC B124B: Automatic High Beam System [07/2022 - ]: 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. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - 07/2022]  . Refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2022 - ] 

Result: 

A 

See step  2

1. Check if a front camera system, 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.

   Refer to DIAGNOSIS SYSTEM [10/2018 - ]

   OK

   No front camera system, dynamic radar cruise control system, lane control system, road sign assist system or 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 [07/2022 - ] 

Result: 

NG 

GO TO FRONT CAMERA SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2022 - ]