DTC B243D: Left Low Beam Fan Malfunction; DTC B243E: Right Low Beam Fan Malfunction [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 and wait 2 minutes.
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 B243D and B243E are not output.

   Result

   Result	Proceed to
   OK	A
   NG (DTC B243D is output)	B
   NG (DTC B243E 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 and wait 2 minutes.
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 B243D 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 and wait 2 minutes.
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 B243E 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 - ]