DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [03/2017 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

2. 10 seconds elapse after turning the engine switch on (IG) and illuminating the low beam headlights using the light control switch.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

   OK

   DTC B2439 and B243A are not output.

   Result

   Result	Proceed to
   OK	A
   NG (DTC B2439 is output)	B
   NG (DTC B243A is output)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2020 - 05/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2023 - ] 

Result: 

C 

See step  3

Result: 

B 

See step  2

1. Interchange the headlight unit assembly LH with RH and connect the connectors to them.

   Refer to REMOVAL [03/2017 - 05/2023] , or refer to REMOVAL [05/2023 - ]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Clear DTCs 

3. 10 seconds elapse after turning the engine switch on (IG) and illuminating the lights using the light control switch.
4. Check for DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   OK

   DTC B2439 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

NG 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

1. Interchange the headlight unit assembly RH with LH and connect the connectors to them.

   Refer to REMOVAL [03/2017 - 05/2023] , or refer to REMOVAL [05/2023 - ]

2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

3. 10 seconds elapse after turning the engine switch on (IG) and illuminating the lights using the light control switch.
4. Check for DTCs.

   Refer to DTC CHECK / CLEAR [03/2017 - 05/2023] , or refer to DTC CHECK / CLEAR [05/2023 - ]

   Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

   OK

   DTC B243A is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [03/2017 - ] 

Result: 

NG 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ]