AUTO LIGHT SYSTEM

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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 BCM sends each light on/off request signal to the electrical supply unit (ESU) based on the signal from the auto light sensor and the electrical supply unit (ESU) turns each light on/off.

Structural View

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System Wiring Diagram

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Operation

Note

• When the ignition is switched ON (engine on or off), the auto light sensor detects the illumination level above and in front of the vehicle regardless of the light switch position.

• The illumination level sensitivity of the auto light sensor can be changed. The illumination level in the explanation for the following operations is the value when setting to [Standard (All Others)]. (See LIGHTING SYSTEM PERSONALIZATION.)

Light on operation

1. The start stop unit detects a light switch status signal (1).

2. The start stop unit sends the light switch status signal (2) to the body control module (BCM) via CAN communication.

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

4. When the body control module (BCM) receives the light switch status signal (AUTO or TNS) and the headlight on request signal with the ignition switched ON (engine off or on), it turns the headlights LO or HI on (5). In addition, an auto-light on condition is set so that the headlights turn on at twilight.

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Light off operation

1. The start stop unit detects a light switch status signal (1).

2. The start stop unit sends the light switch status signal (2) to the body control module (BCM) via CAN communication.

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

4. When the body control module (BCM) receives the light switch status signal (AUTO or TNS) and the headlight off request signal with the ignition switched ON (engine off or on), it turns the headlights LO or HI off (5). In addition, to prevent the headlights from being frequently switched on/off, an auto-light on condition is set with the threshold of the illumination level for turning off set higher than the illumination level for turning on.

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