LIGHTING SYSTEM

FUNCTION OF MAIN COMPONENTS

Component	Function
Main Body ECU (Multiplex Network Body ECU)	Receives various signals and illuminates the headlights, taillights, clearance lights and license plate lights.
Automatic Light Control Sensor	Detects the ambient light level.
Headlight Dimmer Switch Assembly	Outputs a light control signal to the main body ECU (multiplex network body ECU).
Headlight ECU Sub-assembly LH/RH*	Supplies power to the headlights.
Instrument Panel Junction Block Assembly TAIL Relay	Supplies power to the taillights and license plate lights.
Front Door Courtesy Light Switch Assembly (Driver Side)	Detects whether a door is open or closed and transmits a signal to the main body ECU (multiplex network body ECU).

*: Models with LED Type headlight

SYSTEM CONTROL

Operating Condition

The automatic light control system operates as follows:

Function	Outline
Headlights and Taillights turn on	When all of the following conditions are met, the headlights, taillights, clearance lights, and license plate lights automatically turn on: The ambient light is dark or momentarily bright. The power switch is turned on (IG). The light control switch is in the AUTO position.
Headlights and Taillights turn off	When the ambient light is bright, the exterior lights automatically turn off.

Function

Outline

Headlights and Taillights turn on

When all of the following conditions are met, the headlights, taillights, clearance lights, and license plate lights automatically turn on:

Headlights and Taillights turn off

When the ambient light is bright, the exterior lights automatically turn off.

DIAGNOSIS

When the main body ECU (multiplex network body ECU) detects a malfunction in the automatic light control system, Diagnostic Trouble Codes (DTCs) are stored in memory.