DTC B242C-04: Headlight Control Module (Sub) System Internal Failure; DTC B242D-04: Headlight Control Module (Main) System Internal Failure [11/2023 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Headlight Control > Clear DTCs 

   Body Electrical > Headlight Control (Sub) > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the ignition switch to ON.
2. Wait at least 15 minutes.
3. Check for DTCs.

   Body Electrical > Headlight Control > Trouble Codes 

   Body Electrical > Headlight Control (Sub) > Trouble Codes 

   OK

   DTC B242C-04 and B242D-04 are not output.

   Result

   Result	Proceed to
   OK	A
   NG (DTC B242C-04 is output)	B
   NG (DTC B242D-04 is output)	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

B 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [11/2023 - ] 

Result: 

C 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [11/2023 - ]