Toyota Corolla Cross: M20a-fks (fuel)

 Headlight Source LH Malfunction (B243900,B243A00)

DESCRIPTION The headlight ECU sub-assembly LH and headlight ECU sub-assembly RH internally boost the power supply voltage to ensure a constant supplied current for the Lo/Hi beam LED of their respective headlight. By monitoring the LED power supply voltage, abnormal current and malfunctions can be

 Check Bus 7 Line

DESCRIPTION Symptom Trouble Area There are ECUs or sensors that display a communication stop on the bus diagnostic screen. Or, there are ECUs or sensors that display communication stop history on the "Detail" screen. CAN main