DTC B2456: Left Headlight ECU Variation Error [09/2014 - 11/2017]: Procedure
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Lexus RC 350, 2018 Lexus RC 300, 2017 Lexus RC 350, 2017 Lexus RC 300, and 2017 Lexus RC 200t. However, it is still accessible from the selected car via links, so may be relevant.
- CLEAR DTC
- Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]
Body Electrical > HL AutoLeveling > Clear DTCs
Result
Proceed to NEXT
Result:
NEXT
See step 2
- Clear the DTCs.
- CHECK FOR DTC
- Turn the engine switch on (IG).
- Check for DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - 10/2018]
Body Electrical > HL AutoLeveling > Trouble Codes
OK
DTC B2456 is not output.
Result
Proceed to OK NG
Result:
OK
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017]
Result:
NG
See step 3
- CHECK ECM
- Check if the part number of the ECM installed to the vehicle is correct.
OK
Part number is correct.
Result
Proceed to OK NG
Result:
OK
REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to REMOVAL [09/2014 - 10/2018]
Result:
NG
REPLACE ECM WITH CORRECT ONE. Refer to REMOVAL [09/2014 - 11/2017]
- Check if the part number of the ECM installed to the vehicle is correct.