B124B

DTC Code	DTC Name
B124B	Automatic High Beam System

DESCRIPTION

When DTCs for the following systems are stored, this DTC is stored simultaneously.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B124B	Automatic High Beam System	Malfunction in automatic high beam system	CAN communication system Lane departure alert system Lane departure warning camera Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


*1	Lane Departure Warning Camera
*2	Network Gateway ECU
*3	Main Body ECU (Multiplex Network Body ECU)
*4	CAN Communication Line

CAUTION / NOTICE / HINT

Note

Confirm that there are no CAN communication system malfunctions before performing the following inspection.

for LHD:

Click here

for RHD:

Click here
If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.
When the lane departure warning camera is replaced with a new one, adjustment of the lane departure warning camera beam axis must be performed.

PROCEDURE

CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)

Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Result	Proceed to
DTC B124B is not output	A
DTC B124B is output	B

A

USE SIMULATION METHOD TO CHECK Click here

B

CHECK FOR DTC (LANE DEPARTURE ALERT SYSTEM)

Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Result	Proceed to
Lane departure alert system DTCs are not output	A
Lane departure alert system DTCs are output	B
CAN communication system DTCs are output	C

B

GO TO LANE DEPARTURE ALERT SYSTEM Click here

C

GO TO CAN COMMUNICATION SYSTEM Click here

A

CHECK LANE DEPARTURE WARNING CAMERA

Check for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Result	Proceed to
DTC B124B is not output	A
DTC B124B is output	B

A

END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE)

B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

AUTOMATIC HIGH BEAM SYSTEM, Diagnostic DTC:B124B