AUTO LIGHT SYSTEM OPERATION

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Note

•  The illumination intensity which operates the auto light system is approximate and a reference. It varies depending on conditions in the surrounding area (Weather, reflection off buildings).

Operation

Illumination condition

•  If the following conditions are met with the ignition switched ON and the light switch at AUTO, the headlight and TNS turn on after 15 s.

―  The forward and upward illumination level sensors detect approx. 2,000 lux or less.

Lights off condition

•  When the light switch is in the AUTO position, the headlight and TNS turn off under the following conditions:

―  The forward and upward illumination level sensors detect approx. 4,000 lux or more for approx. 2.5 s.

―  The ignition switch is off.

―  The light switch is in the OFF position.

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Illumination operation

1.  When the light switch is in the AUTO position, the illumination sensors in the auto light sensor (installed in the windshield) detect the illumination level above and in front of the vehicle.

2.  If the upward or forward illumination sensors detect approx. 2,000 lux or less in front of and above the vehicle, the headlight and TNS illumination control signal is sent to the auto light/wiper control module.

3.  The microcomputer in the auto light/wiper control module receives the control signal and sends current (1) to transistor A, causing transistor A to turn on.

4.  When transistor A turns on, the TNS relay also turn on. At the same time, the TNS illuminate.

5.  The microcomputer in the auto light/wiper control module receives the control signal and sends current (2) to transistor B, causing transistor B to turn on.

6.  When transistor B turns on, the headlight relay (LO) also turns on. At the same time, the headlights (low-beam) illuminate.

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Lights off operation

1.  When the light switch is in the AUTO position, the illumination level sensors in the auto light sensor (installed in the windshield) detect the illumination level above and in front of the vehicle.

2.  If the upward and forward illumination level sensor detect approx. 4,000 lux or more for 2.5 s in front of and above the vehicle, the headlight and TNS off control signal is sent to the auto light/wiper control module.

3.  The microcomputer in the auto light/wiper control module receives the control signal and turns off the current to transistor A, causing the TNS relay to also turn off.

4.  When the TNS relay turns off, the TNS also turns off.

5.  The microcomputer in the auto light/wiper control module receives the control signal and turns off the current to transistor B, causing the headlight relay (LO) to also turn off.

6.  When the headlight relay (LO) turns off, the headlights (low-beam) also turn off.

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