Lighting and Horns: Description and Operation

System Diagram:

SYSTEM DESCRIPTION

1. LIGHTING SYSTEM
a. Illumination control system (Illuminated entry system):
When a door is unlocked through a key or transmitter operation, or if a door is opened or closed, the illuminated entry system turns on the interior light and the ignition key illumination.

1. The multiplex network body ECU receives the following:
- Door courtesy switch signal - Door detection switch signal
- Ignition switch signal

2. The multiplex network body ECU controls the following:
- Illumination operation signal

3. The multiplex network body ECU controls the on/off and fade-in/fade-out operation of the following:
- Room light assembly
- Ignition key cylinder light
- Personal light (Overhead J/B)

b. Manual light control system:
This system functions if lights such as the headlights and taillights come on by manual operation of the light control switch.

1. The multiplex network body ECU receives the following:
- Light control switch signal
- Fog light switch signal

2. The multiplex network body ECU controls the following:
- HEAD relay operation signal
- TAIL relay operation signal
- FOG relay operation signal
- DRL relay No.2 - DRL relay No.3
- DRL relay No.4

3. The multiplex network body ECU controls the on/off operation of the following signals based on the signals listed in (2).
- Headlight (Low)
- Clearance light
- Taillight
- License plate light
- Fog light

c. Light auto turn off system: When the headlights and taillights are on through the operation of the automatic light control system or through the light control switch, if the ignition switch is turned off and driver side door is opened, this system will turn the headlights and taillights off immediately.

1. The multiplex network body ECU receives the following:
- Door courtesy switch signal
- Ignition switch signal

2. The multiplex network body ECU controls the following:
- HEAD relay operation signal
- TAIL relay operation signal

3. The multiplex network body ECU controls the illuminating period of the following:
- Headlight (Low)
- Headlight (Hi)
- Clearance light
- Taillight
- License plate light
- Fog light

d. Automatic light control system: When the light control switch is in the AUTO position, the automatic light control sensor detects ambient light and automatically turns the headlights and taillights on or off accordingly.

1. The multiplex network body ECU receives the following:
- Light control switch signal
- Automatic light control sensor signal

2. The multiplex network body ECU controls the following:
- HEAD relay operation signal
- TAIL relay operation signal

3. The multiplex network body ECU controls the on/off operation of the following:
- Headlight (Low)
- Clearance light
- Taillight
- License plate light

e. Daytime running light system: This system is directly connected to the high-beam headlights and is designed to automatically activate the daytime running light in order to remain highly visible to other vehicles.

1. The multiplex network body ECU receives the following:
- Ignition switch signal
- READY condition signal
- Parking brake switch signal
- Light control switch signal

2. The multiplex network body ECU controls the following:
- DRL relay operation signal

3. The multiplex network body ECU controls the on/off operation of the following:
- Headlight (Hi)