DTC B243D: Left Low Beam Fan Malfunction; DTC B243E: Right Low Beam Fan Malfunction [12/2017 - 10/2023]: Description

The headlight ECU sub-assembly operates the low beam fan to cool the headlight LED unit in order to prevent the headlight LED unit from overheating.

Illuminates the low beam headlights and continuously operates the low beam fan.

The headlight ECU sub-assembly monitors the pulse signals from the FANP terminal when the low beam fans are operating.

HINT:

If B243D or B243E is output, the headlight ECU sub-assembly performs low beam headlight dimming control.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Note
B243D	Left Low Beam Fan Malfunction	Detection condition: Engine switch on (IG), low beam headlights illuminated Malfunction status: Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected Malfunction duration: 120 seconds or more	Headlight unit assembly LH Headlight ECU sub-assembly LH	AFS	-
B243E	Right Low Beam Fan Malfunction	Detection condition: Engine switch on (IG), low beam headlights illuminated Malfunction status: Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected Malfunction duration: 120 seconds or more	Headlight unit assembly RH Headlight ECU sub-assembly RH	AFS (Sub)	-

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

Note

B243D

Left Low Beam Fan Malfunction

Detection condition:

Malfunction status:

Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected

Malfunction duration:

AFS

B243E

Right Low Beam Fan Malfunction

Detection condition:

Malfunction status:

Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected

Malfunction duration:

AFS (Sub)