DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [11/2021 - 12/2023]: Procedure

Pre-procedure1

• Clear the DTCs.

  for Mono Camera Type:

  Body Electrical > HL AutoLeveling > Clear DTCs 

  Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

  for Stereo Camera Type:

  Body Electrical > AFS > Clear DTCs 

  Body Electrical > AFS (Sub) > Clear DTCs 

• 10 seconds elapse after turning the ignition switch ON and illuminating the low beam headlights using the light control switch.

• Check for DTCs.

  for Mono Camera Type:

  Body Electrical > HL AutoLeveling > Trouble Codes 

  Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

  for Stereo Camera Type:

  Body Electrical > AFS > Trouble Codes 

  Body Electrical > AFS (Sub) > Trouble Codes 

  Result

  Result	Proceed to
  B2439 and B243A are not output	A
  B2439 is output	B
  B243A is output	C

Post-procedure1

• None

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

Result: 

C 

See step  5

Result: 

B 

See step  2

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

   HINT: 

   Refer to DISASSEMBLY [11/2021 - 12/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

1. Clear the DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

   for Stereo Camera Type:

   Body Electrical > AFS > Clear DTCs 

   Body Electrical > AFS (Sub) > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Check for DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Trouble Codes 

   Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

   for Stereo Camera Type:

   Body Electrical > AFS > Trouble Codes 

   Body Electrical > AFS (Sub) > Trouble Codes 

   Result

   Result	Proceed to
   B2439 is output	A
   B243A is output	B

Result: 

A 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2021 - 12/2022]  , or refer to  REMOVAL [12/2022 - 12/2023] 

Result: 

B 

REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [11/2021 - 12/2023] 

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

   HINT: 

   Refer to DISASSEMBLY [11/2021 - 12/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Clear the DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

   for Stereo Camera Type:

   Body Electrical > AFS > Clear DTCs 

   Body Electrical > AFS (Sub) > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Check for DTCs.

   for Mono Camera Type:

   Body Electrical > HL AutoLeveling > Trouble Codes 

   Body Electrical > HL AutoLeveling (Sub) > Trouble Codes 

   for Stereo Camera Type:

   Body Electrical > AFS > Trouble Codes 

   Body Electrical > AFS (Sub) > Trouble Codes 

   Result

   Result	Proceed to
   B243A is output	A
   B2439 is output	B

Result: 

A 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [11/2021 - 12/2022]  , or refer to  REMOVAL [12/2022 - 12/2023] 

Result: 

B 

REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [11/2021 - 12/2023]