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AUTO LIGHT SYSTEM OPERATION

id091800102100

  Note

  • The illumination intensity which operates the auto light/running light system is approximate and a reference. It varies depending on conditions in the surrounding area (Weather, reflection off buildings).
  • When the light switch is in the AUTO position and the command from the auto light sensor is TNS off or headlight off, the running light system control has operation priority.(Running light system-equipped vehicles)

## Operation

### Illumination condition

  • When the ignition switch is turned to the ON position and the light switch is in the AUTO position, the headlight and tail number side lights (TNS) illuminate under the following condition:
  - The forward and upward illumination level sensors detect approx. 2000 lux or less.

### Lights off condition

  • When the light switch is in the AUTO position, the headlights and TNS turn off under the following conditions:
  - The forward and upward illumination level sensors detect approx. 4000 lux or more for approx. 2.5 s.
  - The ignition switch is off.
  - The light switch is in the OFF position.

.

1 | Light switch (AUTO position)
2 | Illumination level
3 | Headlight
4 | TNS and illumination lights
5 | Bright
6 | Dark
7 | Illuminated
8 | Not illuminated

## 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. 2000 lux or less in front of and above the vehicle, a headlight illumination control signal is sent to the auto light control module.

3. The auto light control module receives the control signal and sends currents (1) and (2) to transistors A and B respectively, causing the transistors to turn on.

4. When transistors A and B turn on, the headlight LO and TNS relays also turn on. At the same time, the headlights (low-beam) and TNS illuminate.

Vehicle without running light system

.

1 | Auto light control module
2 | Headlight relay
3 | Headlight (low-beam)
4 | Headlight (high-beam)
5 | TNS relay
6 | Parking light/taillight/license plate light
7 | Front fog light relay
8 | Front fog light
9 | Rear fog light relay
10 | Rear fog light
11 | Front and rear fog light switch
12 | Front fog light switch
13 | Rear fog light switch
14 | Illumination light
15 | Headlight switch
16 | Headlight
17 | Flash-to-pass
18 | AUTO
19 | Auto light sensor
20 | ABS HU/CM or DSC HU/CM
21 | Transistor A
22 | Transistor B

Vehicle with running light system

.

1 | Auto light/running light control module
2 | Relay A
3 | Relay B
4 | Headlight relay
5 | Headlight (low-beam)
6 | Headlight (high-beam)
7 | TNS relay
8 | Parking light/taillight/license plate light
9 | Front fog light relay
10 | Front fog light
11 | Rear fog light relay
12 | Rear fog light
13 | Front and rear fog light switch
14 | Front fog light switch
15 | Rear fog light switch
16 | Illumination light
17 | Headlight switch
18 | Headlight
19 | Flash-to-pass
20 | AUTO
21 | Auto light sensor
22 | ABS HU/CM or DSC HU/CM
23 | Transistor A
24 | Transistor B

## 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. 4000 lux or more for 2.5 s in front of and above the vehicle, a headlight off control signal is sent to the auto light control module.

3. The auto light control module receives the control signal and turns off the currents to transistors A and B, causing the headlight (low-beam) and TNS relays to also turn off.

4. When the headlight LO and TNS relays turn off, the headlights (low-beam) and TNS also turn off.

Vehicle without running light system

.

1 | Auto light control module
2 | Headlight relay
3 | Headlight (low-beam)
4 | Headlight (high-beam)
5 | TNS relay
6 | Parking light/taillight/license plate light
7 | Front fog light relay
8 | Front fog light
9 | Rear fog light relay
10 | Rear fog light
11 | Front and rear fog light switch
12 | Front fog light switch
13 | Rear fog light switch
14 | Illumination light
15 | Headlight switch
16 | Headlight
17 | Flash-to-pass
18 | AUTO
19 | Auto light sensor
20 | ABS HU/CM or DSC HU/CM
21 | Transistor A
22 | Transistor B

Vehicle with running light system

.

1 | Auto light/running light control module
2 | Relay A
3 | Relay B
4 | Headlight relay
5 | Headlight (low-beam)
6 | Headlight (high-beam)
7 | TNS relay
8 | Parking light/taillight/license plate light
9 | Front fog light relay
10 | Front fog light
11 | Rear fog light relay
12 | Rear fog light
13 | Front and rear fog light switch
14 | Front fog light switch
15 | Rear fog light switch
16 | Illumination light
17 | Headlight switch
18 | Headlight
19 | Flash-to-pass
20 | AUTO
21 | Auto light sensor
22 | ABS HU/CM or DSC HU/CM
23 | Transistor A
24 | Transistor B