DTC B124B: Automatic High Beam System [10/2014 - 09/2017]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - ]

   Body Electrical > Main Body > Clear DTCs 

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - ]

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017] 

Result: 

B 

See step  2

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - 09/2017]

   Chassis > Lane Departure Alert > 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

Result: 

B 

GO TO LANE DEPARTURE ALERT SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017] 

Result: 

C 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 09/2017] 

Result: 

A 

See step  3

1. Replace the lane departure warning camera with a new one.

   Refer to REMOVAL [10/2014 - 09/2017]

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2014 - ]

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

A 

END (LANE DEPARTURE WARNING CAMERA WAS DEFECTIVE) 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2014 - 05/2019]