Lighting and Horns: Description and Operation
System Diagram (Part 1):
System Diagram (Part 2):
System Diagram (Part 3):
System Diagram (Part 4):
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)
2. POWER DISTRIBUTOR:
a. The power distributor installed in the J/B No.2 uses the no-contact type relay with a semiconductor.
b. By using no-contact type semiconductor relays, the power distributor has been made more compact and lightweight than the previous relay box containing contact type relays.
c. In addition to the function of the conventional relay box (Engine Room J/B), the Power Distributor has a function to protect the Power Distributor circuit if overcurrent is applied to the Power Distributor or overheating occurs. The Power Distributor also has a mode monitor terminal for external checking of the operating condition (normal or protect condition) of the Power Distributor.
d. Relay Type:
e. When the semiconductor relay is operating normally, the mode monitor terminal outputs approximately 6.2 V. When the semiconductor relay operates in protect mode, the mode monitor terminal outputs about 2 V. However, the mode monitor terminal outputs for the overall operating condition of the power distributor, so it is not possible to specify the semiconductor relay during protect operation.
f. When the fail-safe function operates, the power distributor performs the following operations:
1. Stops the operation of the troubled semiconductor relay only.
2. Stops the power supply to the troubled semiconductor relay circuit only.
HINT: Normal semiconductor relay or circuit operates properly.
g. While the fail-safe function operates, check for a short circuit in the following areas:
1. Wire harness driven by relay on the terminal side and body ground
2. Inside the power distributor (including the semiconductor relay)
h. The power distributor soon restores the semiconductor relay function, but if a load abnormality still continues, the power distributor again stops the semiconductor relay function. (except Rr-DEF Relay)
i. The power distributor and the semiconductor relay function stop until the rear defogger switch turns on again. Then the rear defogger switch turns on again, the semiconductor relay function recovers, but if the load abnormality is not corrected by this time, the Power Distributor again stops the semiconductor relay function. If the load abnormality is corrected, the semiconductor relay function recovers when the rear defogger switch turns on again. (Rr-DEF Relay)