DTC B2443: Lost Communication with Left Headlight and Right Headlight LIN [09/2014 - 03/2019]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the engine switch on (IG).
2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   OK

   DTC B2443 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019] 

Result: 

NG 

See step  3

1. Disconnect the A3 headlight light control ECU sub-assembly LH connector.
2. Disconnect the A11 headlight light control ECU sub-assembly RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A3-20 (LINL) - A11-20 (LINL)	Always	Below 1 Ω
   A3-20 (LINL) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Replace the headlight light control ECU sub-assembly RH with a new or known good one.

   Refer to REMOVAL [09/2014 - 03/2019]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Turn the engine switch on (IG).
2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   OK

   DTC B2443 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY RH WAS DEFECTIVE) 

Result: 

NG 

REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2014 - 03/2019]