DTC B242F: Open in B Power Line [10/2022 - 10/2023]: Description

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (No. 1 semiconductor power integration ECU) to ON.

The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Note
B242F	Open in B Power Line	Detection condition: Engine switch on (IG) Malfunction status: No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal Malfunction duration: 10 seconds or more	Headlight ECU sub-assembly LH No. 1 semiconductor power integration ECU Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Harness or connector	AFS	-

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Note

B242F

Open in B Power Line

Detection condition:

Engine switch on (IG)

Malfunction status:

No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal

Malfunction duration:

10 seconds or more

Headlight ECU sub-assembly LH
No. 1 semiconductor power integration ECU
Main body ECU (multiplex network body ECU)
Instrument panel junction block assembly
Harness or connector

AFS

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Note
B242F	Open in B Power Line	Detection condition: Engine switch on (IG) Malfunction status: No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal Malfunction duration: 10 seconds or more	Headlight ECU sub-assembly RH No. 1 semiconductor power integration ECU Main body ECU (multiplex network body ECU) Harness or connector	AFS (Sub)	-