DTC B124B: Automatic High Beam System: Procedure
- CHECK FOR DTC (AUTOMATIC HIGH BEAM SYSTEM)
- Clear the DTCs. Refer to DTC CHECK / CLEAR .
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
OK
DTC B124B is not output.
NG → See step 2
OK → See step 6
- CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
Result
Result Proceed to Vehicle stability control system DTCs are not output A Vehicle stability control system DTCs are output B CAN communication system DTC is output C
B → See step 5
C → See step 8
A: Go to next step
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
- CHECK FOR DTC (SFI SYSTEM)
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
Result
Result Proceed to SFI system DTCs are not output A SFI system DTCs are output B CAN communication system DTC is output C
B → See step 7
C → See step 8
A: Go to next step
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
- CHECK INNER REAR VIEW MIRROR ASSEMBLY
- Replace the inner rear view mirror assembly with a new or known good one. Refer to REMOVAL .
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
OK
DTC B124B is not output.
NG → See step 9
OK → END (INNER REAR VIEW MIRROR ASSEMBLY WAS DEFECTIVE)
- GO TO VEHICLE STABILITY CONTROL SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART
- USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- GO TO SFI SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART
- GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to REMOVAL