DTC B2439: Headlamp LH Circuit; DTC B243A: Headlamp RH Circuit [09/2019 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the engine switch on (IG).
2. Operate the light control switch to turn on the low beam headlights.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > 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 [09/2019 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] 

Result: 

C 

See step  6

Result: 

B 

See step  3

1. Replace the headlight unit assembly LH with a new or known good one.

   Refer to REMOVAL [09/2019 - 08/2020] , or refer to REMOVAL [08/2020 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Turn the engine switch on (IG).
2. Operate the light control switch to turn on the low beam headlights.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Trouble Codes 

   OK

   DTC B2439 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE) 

Result: 

NG 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

1. Replace the headlight unit assembly RH with a new or known good one.

   Refer to REMOVAL [09/2019 - 08/2020] , or refer to REMOVAL [08/2020 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

1. Turn the engine switch on (IG).
2. Operate the light control switch to turn on the low beam headlights.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Trouble Codes 

   OK

   DTC B243A is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE) 

Result: 

NG 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [09/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - ]