DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [09/2016 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Operate the light control switch to turn on the low beam headlights.
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
6. Check for DTCs.

   Body Electrical > HL AutoLeveling > 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 [09/2016 - 05/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2019 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - 06/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2021 - ] 

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 DISASSEMBLY [09/2016 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Operate the light control switch to turn on the low beam headlights.
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
6. Check for DTCs.

   Body Electrical > HL AutoLeveling > 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2016 - ] 

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

   Refer to DISASSEMBLY [09/2016 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  7

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  8

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Operate the light control switch to turn on the low beam headlights.
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
6. Check for DTCs.

   Body Electrical > HL AutoLeveling > 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [09/2016 - ]