Lighting System System Description

Body Electrical. Camry. Acv40 Gsv40
Lighting. Camry. Acv40 Gsv40

  1. MANUAL LIGHT CONTROL SYSTEM

  1. AUTOMATIC LIGHT CONTROL SYSTEM

  1. LIGHT AUTO TURN OFF SYSTEM

  1. ILLUMINATED ENTRY SYSTEM

  1. POWER DISTRIBUTOR

  1. HID HEADLIGHT SYSTEM

  1. AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

  1. MANUAL HEADLIGHT BEAM LEVEL CONTROL SYSTEM

Lighting System -- System Description



MANUAL LIGHT CONTROL SYSTEM
This system functions if the lights such as the headlights and taillights come on by manual operation of the light control switch.

  1. The main body ECU controls this system based on the signals listed below.

    Input
    		Output
    		Lights that illuminate
    Light control switch TAIL signal
    		Taillight relay drive signal
    1. Taillights
    2. License plate lights
    3. Parking lights
    Light control switch HEAD signal
    		Headlight relay drive signal
    		Low beam headlights

AUTOMATIC LIGHT CONTROL SYSTEM
When the light control switch is in the AUTO position, the automatic light control sensor detects ambient light, converts it into an electrical signal, and outputs it to the main body ECU. The main body ECU automatically turns the headlights and taillights on or off according to the signal.

  1. The main body ECU controls this system based on the signals listed below.

    Input
    		Output
    		Lights that illuminate
    1. Light control switch AUTO signal
    2. Automatic light control sensor signal
    1. Headlight relay drive signal
    2. Taillight relay drive signal
    1. Low beam headlights
    2. Taillights
    3. License plate lights
    4. Parking lights

LIGHT AUTO TURN OFF SYSTEM
The light auto turn off system is used to prevent the driver from leaving the vehicle with the headlights, fog lights, parking lights, taillights or license plate lights on. When the headlights or taillights are on, ignition switch is off and driver side door is opened, the main body ECU turns off the lights automatically.

  1. The main body ECU controls this system based on the signals listed below.

    Input
    		Output
    		Lights that operate
    1. Combination switch signal
    2. Door courtesy switch signal
    3. Ignition switch signal
    1. Headlight relay OFF demand
    2. Taillight relay OFF demand
    3. High beam headlight relay OFF demand
    4. Front fog light relay OFF demand
    5. Rear fog light relay OFF demand
    1. Low beam headlights
    2. Taillights, license plate lights and parking lights
    3. High beam headlights
    4. Front fog lights
    5. Rear fog lights

ILLUMINATED ENTRY SYSTEM
When a door is unlocked through key or transmitter operation, or if a door is opened, the illuminated entry system turns on the interior light and the ignition key cylinder light.

  1. The main body ECU controls this system. The operation and condition of the illuminated entry system are described below.

    Operation
    		Condition
    Fade in
    		When either of the following conditions is met, the interior light and ignition key cylinder light fade in:
    1. Any door is opened.
    2. Any door is unlocked when the ignition switch is off and all doors are closed.
    3. Ignition switch is turned from ACC position to OFF when all doors are closed.
    Fade out immediately
    		When either of the following conditions is met, the interior light and ignition key cylinder light fade out:
    1. The ignition switch is turned from OFF to the ACC or ON position when all doors are closed.
    2. All doors are locked when the ignition switch is off.
    Illuminate for approximately 15 seconds, and then fade out
    		Any doors are closed when the ignition switch is off.
    Fade out (Battery saving)
    		When the following conditions are met, the interior light and ignition key cylinder light fade out:
    1. A key is not inserted in the ignition key cylinder.
    2. There are no changes in the condition of the doors for 20 minutes.

POWER DISTRIBUTOR


    Camry. Acv40 Gsv40.Lighting.Lighting System.Lighting System System Description

  1. The power distributor (engine room J/B assembly) is installed in the engine room R/B. The low beam headlight relays and high beam headlight relay are installed in the power distributor.

  2. When a short malfunction occurs between the power distributor and high beam headlight bulbs, the fail-safe function operates.

  3. When the fail-safe function operates, the power distributor stops the operation of the high beam headlight relay.


HID HEADLIGHT SYSTEM
The HID (High Intensity Discharge) headlight system uses a discharge bulb as its light source for the LO beam. Discharge bulbs have features superior to halogen bulbs.

  1. Discharge bulbs have the following feature:

    1. The light emitted by the bulb is close in color to sunlight. The light shines ahead over a broader range and farther forward, increasing the visibility of the driver.
    2. Discharge bulbs consume less power.

  2. This system consists of discharge bulbs and the light control ECU. The light control ECU is installed in the headlight assembly.

  3. The light control ECUs transform the voltage that is input from the battery to a high voltage of up to 20,000 V and applies it to the discharge bulbs in order to illuminate them.

  4. A fail-safe function is provided as a countermeasure against the high voltage that is generated in case that a problem occurs in the headlight system.

    NOTICE:
    For safety reasons, do not attempt to measure the voltage output from a light control ECU.

AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

  1. General

    1. This system maintains the headlight LO beams at a constant level while the vehicle is stopping.
    2. This system is controlled by the headlight beam level control ECU. This ECU detects the vehicle posture via the rear height control sensor, and detects the vehicle speed via the combination meter. The ECU then controls the headlight leveling motor based on these pieces of information, in order to change the headlight reflector angle.
    NOTICE:
    1. Initialize the height control sensor signal after the vehicle height changes due to replacement of the suspension or after performing such operations as removal and reinstallation or replacement of the rear height control sensor sub-assembly.
    2. When the headlight beam level control ECU is replaced, the initialization is also necessary.

  2. Function and construction of components

    Components
    		Function and Construction
    Rear height control sensor
    		Detects the amount of vehicle height.
    Combination meter
    1. Outputs the vehicle speed signal to the headlight beam level control ECU.
    2. Warning indicator in the combination meter illuminates for 3 seconds and then goes off when the ignition switch is turned to the ON position (bulb check function).
    3. Warning indicator in the combination meter illuminates to alert the driver when a malfunction in this system is detected.
    Headlight leveling motor
    		Based on the signals received from the headlight beam level control ECU, each motor moves the reflector in the headlight to vary its LO beam.
    DLC3
    		The height control sensor signal initialization and headlight leveling motor operation check can be performed via the DLC3.
    Headlight beam level control ECU
    1. Based on the signals that are transmitted by height control sensor and combination meter, this ECU detects the amount of variance of the vehicle posture while the vehicle is stopped.
    2. Based on the detected value, this ECU outputs control signals to the headlight leveling motor.
    3. This ECU turns on the headlight beam level control system warning indicator for 3 seconds when the ignition switch is turned to the ON position (bulb check function).
    4. This ECU turns on the headlight beam level control system warning indicator to alert the driver when a malfunction in this system is detected.


    3. Camry. Acv40 Gsv40.Lighting.Lighting System.Lighting System System Description

  3. Fail-safe function
    The headlight beam level control ECU operates in the fail-safe mode if an abnormal condition has been detected, and illuminates the automatic headlight leveling system warning light in the combination meter when a malfunction is detected in the height control sensor.


MANUAL HEADLIGHT BEAM LEVEL CONTROL SYSTEM

  1. When the vehicle posture changes in accordance with the number (weight) of passengers and volume of luggage, this system enables the adjustment of the LO beam level (11-step) of the headlights manually to the appropriate level based on the position of the headlight leveling switch.

    1. The beam level of the headlight can be adjusted by the headlight leveling motor that are installed in the headlight assembly.
    2. A headlight leveling switch is provided to allow the driver to control this system.