DTC B242C-04: Headlight Control Module (Sub) System Internal Failure; DTC B242D-04: Headlight Control Module (Main) System Internal Failure [10/2023 - ]: Procedure

1. Clear the DTCs.

   Body Electrical > Headlight Control (Sub) > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

Pre-procedure1

1. Turn ignition switch to ON.
2. Wait 10 seconds or more.

   Procedure1

3. Check for DTCs.

   Body Electrical > Headlight Control (Sub) > Trouble Codes 

   Result

   Result	Proceed to
   B242C-04 is not output	A
   B242C-04 is output	B

   Post-procedure1

4. None

Result: 

B 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2020 - ] 

Result: 

A 

See step  3

1. Clear the DTCs.

   Body Electrical > Headlight Control > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

Pre-procedure1

1. Turn ignition switch to ON.
2. Wait 10 seconds or more.

   Procedure1

3. Check for DTCs.

   Body Electrical > Headlight Control > Trouble Codes 

   Result

   Result	Proceed to
   B242D-04 is not output	A
   B242D-04 is output	B

   Post-procedure1

4. None

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

Result: 

B 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2020 - ]