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AUTO LIGHT SYSTEM

AUTO LIGHT SYSTEM

SM2334241

id091800010500



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 turns each light on/off based on the signal from the auto light sensor.
• The BCM does not illuminate the headlights for a 15 s period after the BCM receives the headlight illumination request signal from the auto light system while the daytime vehicle speed is 1 km/h {0.6 mph} or more. As a result, headlight flicker occurring by the headlights being illuminated for a short period while in places such as a short tunnel is prevented.


Auto wiper interlocking auto light function

• When the BCM receives a windshield wiper LO or HI operation request signal for 15 s or more from the auto light sensor (rain sensor), it turns on the headlights and TNS (parking lights).



Structure/Construction


System structure
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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 auto light system operates when the ignition is switched ON (engine on or off) and the light switch is in the AUTO position/TNS position.
• The following illumination level is a reference. The illumination level varies depending on the surrounding conditions (weather, reflection off buildings).
• 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 [Medium].


Headlight on operation

1.When the light switch is in the AUTO position/TNS position with the ignition switched ON (engine off or on), the instrument cluster detects (1) an auto light signal.

2.The instrument cluster sends (2) the auto light signal to the body control module (BCM) via CAN communication.

3.When the auto light sensor detects (3) an average 400 lux or less per 1 min for upward illumination, it sends (4) a headlight on request signal to the body control module (BCM) via LIN communication.

4.When the body control module (BCM) receives the auto light signal and headlight on request signal, it turns the headlights LO and HI on (5).
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Headlight off operation

1.When the light switch is in the AUTO position/TNS position with the ignition switched ON (engine off or on), the instrument cluster detects (1) an auto light signal.

2.The instrument cluster sends (2) the auto light signal to the body control module (BCM) via CAN communication.

3.When the auto light sensor detects (3) an average 800 lux or more per 1 min for upward and forward illumination, it sends (4) a headlight off request signal to the body control module (BCM) via LIN communication.

4.When the body control module (BCM) receives the auto light signal and headlight off request signal, it turns the headlights LO and HI off (5).
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Auto wiper interlocking auto light operation

Note
• For details on the auto wiper operation, refer to the [AUTO WIPER SYSTEM]. (See AUTO WIPER SYSTEM.)

1.When the light switch and windshield wiper switch are operated to the AUTO position with the ignition switched ON (engine off or on), the instrument cluster detects (1) an auto light signal and an auto wiper signal.

2.The instrument cluster sends (2) the auto light signal and an auto wiper signal to the BCM via CAN communication.

3.The auto light sensor/rain sensor detects the rainfall amount from the auto wiper system, and sends (3) a windshield wiper LO or HI operation request signal to the BCM via LIN communication.

4.When the BCM receives the windshield wiper LO or HI operation request signal for 15 s or more from the auto light sensor/rain sensor, it turns on (4) the TNS (parking lights) and headlights LO.
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