AUTO LIGHT SYSTEM [(E)]


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Outline

•  The auto light system automatically turns the TNS (parking lights), headlight, and panel light on/off according to the illumination level above and in front of the vehicle.

Function

•  The body control module (BCM) turns each light on/off based on the signal from the auto light sensor.
Note
•  Each light turns on/off as follows.

Main power

ACC or OFF

ON

Light switch position

OFF*1

AUTO

TNS (parking lights)

HEAD

OFF*1

AUTO

TNS (parking lights)

HEAD

Headlight
Not illuminated
Not illuminated
Not illuminated
Not illuminated
Automatically turns on/off*2*4
Automatically turns on/off*3*4
Illuminated
Running light
Not illuminated
Not illuminated
Not illuminated
Not illuminated
Not illuminated
TNS (parking lights)
Not illuminated
Not illuminated
Illuminated
Not illuminated
Illuminated

*1  :The light switch automatically returns to the AUTO position.
*2  :When the surrounding area is bright the running lights turn on, when the surrounding area is dark the headlights and TNS (parking lights) turn on.
*3  :When the surrounding area is bright the running lights and TNS (parking lights) turn on, when the surrounding area is dark the headlights and TNS (parking lights) turn on.
*4  :When the light switch is switched to OFF while the vehicle is stopped, all illuminated lights turn off. When the light switch is switched from a position other than TNS (parking lights) to the TNS (parking lights) position, the running lights or headlights turn off. The lights that were turned off turn on again when the vehicle starts to accelerate.

Structure/Construction


System structure

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System wiring diagram

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Operation

1.  When the instrument cluster detects a light switch status (AUTO or TNS) signal (1), it sends (2) the light switch status (AUTO or TNS) signal to the body control module (BCM) via CAN communication.

2.  The auto light sensor determines (3) the on/off of each light from the change in the illumination level outside of the vehicle and sends an auto light on/off request signal (4) to the body control module (BCM) via LIN communication.

3.  When the body control module (BCM) receives the light switch status (AUTO or TNS) signal and the auto light on/off request signal, it switches each light on/off (5).

•  The auto light on condition is set so that the headlights turn on at twilight.
•  To prevent the headlights from being frequently switched from on to off or off to on, the threshold of the illumination level for turning off is set higher than the threshold of the illumination level for turning on.

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