DTC B242C-04: Headlight Control Module (Sub) System Internal Failure; DTC B242D-04: Headlight Control Module (Main) System Internal Failure [02/2024 - ]: 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

Pre-procedure1

1. Turn the ignition switch to ON.
2. Wait for at least maximum 15 minutes.

   Procedure1

3. Check for DTCs.

   Body Electrical > Headlight Control > Trouble Codes 

   Body Electrical > Headlight Control (Sub) > Trouble Codes 

   Result

   Result	Proceed to
   Any Headlight Control DTCs in the table below are output	A
   Any Headlight Control (Sub) DTCs in the table below are output	B
   No DTCs in the table below are output	C

   Malfunction Content	System	Relevant DTC
   Headlight Control Module (Main) System Internal Failure	Headlight Control	B242D-04	Headlight Control Module (Main) System Internal Failure
   Headlight Control Module (Sub) System Internal Failure	Headlight Control (Sub)	B242C-04	Headlight Control Module (Sub) System Internal Failure

   Post-procedure1

4. None

Result: 

A 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH 

Refer to REMOVAL [02/2024 - ]

Result: 

B 

REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH 

Refer to REMOVAL [02/2024 - ]

Result: 

C 

USE SIMULATION METHOD TO CHECK 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2024 - ]