DTC B2439: Headlight LH Circuit; DTC B243A: Headlight RH Circuit [03/2017 - ]: Description

The No. 1 headlight ECU sub-assembly supplies internally boosted voltage to the LED so that the current supplied to the LED is always maintained at a constant value.

These DTCs are also output when the No. 1 headlight ECU sub-assembly detects malfunctions while monitoring the applied voltage.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
B2439	Headlight LH Circuit	Detection condition: Engine switch on (IG), low beam headlights illuminated Malfunction status: LED (LED) malfunction Open/short in LED (LEG) circuit Malfunction duration: 10 seconds or more	Headlight unit assembly LH No. 1 headlight ECU sub-assembly LH	HL AutoLeveling
B243A	Headlight RH Circuit	Detection condition: Engine switch on (IG), low beam headlights illuminated Malfunction status: LED (LED) malfunction Open/short in LED (LEG) circuit Malfunction duration: 10 seconds or more	Headlight unit assembly RH No. 1 headlight ECU sub-assembly RH	HL AutoLeveling (Sub)

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2439

Headlight LH Circuit

Detection condition:

Engine switch on (IG), low beam headlights illuminated

Malfunction status:

LED (LED) malfunction
Open/short in LED (LEG) circuit

Malfunction duration:

10 seconds or more

Headlight unit assembly LH
No. 1 headlight ECU sub-assembly LH

HL AutoLeveling

B243A

Headlight RH Circuit

Detection condition:

Engine switch on (IG), low beam headlights illuminated

Malfunction status:

LED (LED) malfunction
Open/short in LED (LEG) circuit

Malfunction duration:

10 seconds or more

Headlight unit assembly RH
No. 1 headlight ECU sub-assembly RH

HL AutoLeveling (Sub)