System Description

SYSTEM DIAGRAM

Component		Function
Optical sensor		Refer to Optical Sensor.
IPDM E/R		Controls the integrated smart FET, and supplies voltage to the load according with the request from BCM via CAN communication. Transmits the control signal and request (via LIN communication) to the load according with the request from BCM via CAN communication.
BCM		Detects each switch condition by the combination switch reading function. Exterior light ON/OFF is judged from each signal, and then a request is transmitted to IPDM E/R (via CAN communication) to controls the each lamps. It also transmits a status to the combination meter (via CAN communication) to turns indicator light ON/OFF.
Combination meter		Turns the indicator light ON/OFF according to the status from BCM via CAN communication. Combination meter transmits parking brake status signal to BCM via CAN communication.
ABS actuator and electric unit (control unit)		ABS actuator and electric unit (control unit) transmits vehicle speed signal to BCM via CAN communication.
TCM		TCM transmits shift position signal to BCM via CAN communication.
Combination switch	Lighting & turn signal switch	Inputs the each switch condition signal to BCM.

OUTLINE

Intelligent auto light system is controlled by each function of BCM and IPDM E/R.
Control by BCM
- Combination switch reading function
- Auto light function
- Wiper linked auto lighting function
- Delay timer function
Control by IPDM E/R
- Smart FET control function
- LIN communication function
Intelligent auto light system has the auto light function, wiper linked auto lighting function and delay timer function.
- Auto light function automatically turns ON/OFF the exterior lamps*, depending on the outside brightness.
- Wiper linked auto lighting function automatically turns ON/OFF the exterior lamps* when the lighting switch is in the AUTO position, according to a front wiper operation.
- Delay timer function turns the exterior lamps* OFF depending on the vehicle condition with the auto light function when the ignition switch is turned OFF.

*: Headlight (LO/HI), front fog light, parking light, license plate light, side marker light and tail light.

note	Headlight (HI) depend on the combination switch condition. Front fog light depend on the combination switch condition.

AUTO LIGHT FUNCTION

BCM detects the combination switch condition with the combination switch reading function.
BCM detects the vehicle condition that is required for auto light control with the following signals.
- Parking brake status signal (received from combination meter via CAN communication)
- Vehicle speed signal [received from ABS actuator and electric unit (control unit) via CAN communication]
- Shift position signal (received from TCM via CAN communication)
BCM supplies voltage to the optical sensor when the ignition switch is turned ON.
Optical sensor converts outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.
When ignition switch is turned ON, BCM detects outside brightness from the optical sensor signal and judges ON/OFF condition of each exterior light, depending on the outside brightness condition.
BCM transmits each request signal to IPDM E/R and each status signal to combination meter via CAN communication, according to ON/OFF condition by the auto light function.
Lighting conditions for lighting switch AUTO (When all of the following conditions are satisfied)
- Ignition switch ON
- Parking brake is released or vehicle speed is 4 km/h (2.5 MPH) or more
- Lighting judgment ON depending on the brightness outside of vehicle
Lighting off conditions for lighting switch AUTO (When any of the following conditions are satisfied)
- Ignition switch OFF
- Vehicle speed is 3 km/h (1.8 MPH) or less and parking brake is operated*
  *: Only before releasing the parking brake. After releasing the parking brake, it will not turn lights OFF if the parking brake is operate again.
- Lighting judgment OFF depending on the brightness outside of vehicle
Headlight lighting conditions when the lighting switch is 1ST (When all of the following conditions are satisfied)
- Ignition switch ON
- Vehicle speed is 4 km/h (2.5 MPH) or more, or parking brake is released and other than select lever P range
- Lighting judgment ON depending on the brightness outside of vehicle
Headlight lighting off conditions when the lighting switch is 1ST (When any of the following conditions are satisfied)
- Ignition switch OFF
- Vehicle speed is 3 km/h (1.8 MPH) or less and parking brake is operated
- Vehicle speed is 3 km/h (1.8 MPH) or less and select lever is P range
- Lighting judgment OFF depending on the brightness outside of vehicle

WIPER LINKED AUTO LIGHTING FUNCTION

BCM turns each exterior light ON when the within 60 seconds detecting 4 operations of the front wiper while the lighting switch is in AUTO position.

note	BCM turns OFF the headlamps 3 seconds after the front wiper switch is turned OFF.

DELAY TIMER FUNCTION

BCM turns the exterior lamps OFF depending on the vehicle condition with the auto light function when the ignition switch is turned OFF.

Turns the exterior lamps OFF 30 seconds after the ignition switch is turned OFF.
Delay timer function turns OFF, when the engine running or the lighting switch is other than AUTO.

note	When any position other than the lighting switch AUTO is set, the auto light system function switches to the exterior light battery saver function.