HEADLAMP SYSTEM

XENON TYPE

System Diagram

OUTLINE

Headlamp is controlled by combination switch reading function and headlamp control function of BCM, and relay control function of IPDM E/R.

HEADLAMP (LO) OPERATION

BCM detects the combination switch condition with the combination switch reading function.
BCM transmits the low beam request signal to IPDM E/R with CAN communication according to the headlamp (LO) ON condition.

Headlamp (LO) ON condition

IPDM E/R turns the integrated headlamp low relay ON, and turns the headlamp ON according to the low beam request signal.

HEADLAMP (HI) OPERATION

BCM transmits the high beam request signal to IPDM E/R and the combination meter with CAN communication according to the headlamp (HI) ON condition.

Headlamp (HI) ON condition

Combination meter turns the high beam indicator lamp ON according to the high beam request signal.
IPDM E/R turns the integrated headlamp high relay ON, and turns the headlamp ON according to the high beam request signal.

1.	Headlamp (HI)	2.	Headlamp (LO)	3.	Combination switch
4.	BCM	5.	IPDM E/R	6.	High beam indicator lamp
A.	Dash side lower (passenger side)	B.	Engine room dash panel (RH)	C.	On the combination meter

Part		Description
BCM		Detects each switch condition by the combination switch reading function. Judges that the headlamp is turned ON according to the vehicle condition. Requests the headlamp relay (HI/LO) ON to IPDM E/R (with CAN communication). Requests the high beam indicator lamp ON to the combination meter (with CAN communication).
IPDM E/R		Controls the integrated relay, and supplies voltage to the load according to the request from BCM (with CAN communication).
Combination switch (Lighting & turn signal switch)		Refer to System Diagram.
Combination meter (High beam indicator lamp)		Turns the high beam indicator lamp ON according to the request from BCM (with CAN communication).
Front combination lamp assembly	HID control unit Xenon bulb	Refer to Description.