DTC B242F-14: ECUB Circuit Short to Ground or Open [11/2023 - ]: Description

The headlight ECU sub-assembly operates using the power source voltage input from the IGR 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 (H-LP LH relay and H-LP RH relay) to ON.

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B242F-14	ECUB Circuit Short to Ground or Open	Detection condition: The ignition switch is ON Malfunction status: No power source voltage supplied to ECUB terminal while power source voltage being supplied to IGR terminal Malfunction duration: 10 seconds or more	Headlight ECU sub-assembly LH Harness or connector H-LP LH relay Power distribution box assembly Main body ECU (multiplex network body ECU)	Headlight Control

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B242F-14

ECUB Circuit Short to Ground or Open

Detection condition:

The ignition switch is ON

Malfunction status:

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

Malfunction duration:

10 seconds or more

Headlight ECU sub-assembly LH
Harness or connector
H-LP LH relay
Power distribution box assembly
Main body ECU (multiplex network body ECU)

Headlight Control

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B242F-14	ECUB Circuit Short to Ground or Open	Detection condition: The ignition switch is ON Malfunction status: No power source voltage supplied to ECUB terminal while power source voltage being supplied to IGR terminal Malfunction duration: 10 seconds or more	Headlight ECU sub-assembly RH Harness or connector H-LP RH relay Power distribution box assembly Main body ECU (multiplex network body ECU)	Headlight Control (Sub)