Lexus SC300 / Lexus SC400. Manual - part 207
(HEADLIGHT SYSTEM)
Description – Headlight System
The component parts of this system and their function are described in the following table.
Parts Name
Function
Light Control Switch
Grounds current from the headlight control relay and taillight control relay via the
integration relay, switching each relay and supplying current to the appropriate bulbs
accordance with the switch position.
Dimmer Switch
Grounds current from the dimmer relay in accordance with the switch position, turning
on the ”LO–Beam” or ”HI Beam” lights. In the case of ”FLASH” it turns the heading
control relay and turns on the ”HI Beam” lights.
Headlight Control
Relay
Turned on by signals from the light control switch, dimmer switch and running light
relay and supplies current to each bulb or headlight dimmer relay.
Headlight
Dimmer Relay
Receives current from the headlight control relay, which switches the relay according
to the position of the dimmer switch and sends current to the headlight ”LO–Beam”
or ”HI Beam”.
Integration Relay
Carries out ”Light Auto Turn–off” of the headlights and taillights and cuts off current to
the light control switch in accordance with signals from the GAUGE fuse and courtesy
switch.
Door Courtesy
Switch/Driver’s
Detects when the door is open and sends the appropriate signals to integration relay.
(Light Auto Turn–Off System)
Parking Brake
Switch
(CANADA)
Detects when the parking brake lever is released and sends the appropriate signals to
daytime running light relay.
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BODY ELECTRICAL SYSTEM
Lighting System
BE–29