Auto Light System

AUTO LIGHT SYSTEM SCHEMATIC






AUTO LIGHT SYSTEM

System Description
Automatically turns ON/OFF parking lamps and the headlamps in accordance with ambient light.
Timing for when the lamps turn ON/OFF can be selected using four modes.

OUTLINE
The auto light control system has an optical sensor inside it that detects outside brightness.
When the lighting switch is in AUTO position, it automatically turns ON/OFF the parking lamps and the headlamps in accordance with the ambient light. Sensitivity can be adjusted in four steps. For the details of the setting, Refer to LT-55, "Preliminary Check". Preliminary Check

Optical sensor control mode can be changed by the function setting of CONSULT-III or display.
Optical sensor, power is supplied
- from BCM (body control module) terminal 17
- to optical sensor terminal 1.

Optical sensor, ground is supplied
- to optical sensor terminal 3
- through BCM terminal 18.

When ignition switch is turn to ON position, and
When outside brightness is darker than prescribed level, input is supplied
- from optical sensor terminal 2
- to BCM terminal 14

The headlamps will then illuminate.

DELAY TIMER FUNCTION
Delay timer function carries out a function that BCM activates the timer and controls lights out of headlamps by door switch signal and lightning switch signal when turning the Ignition switch OFF while it is ON and headlamps are ON by the auto light function.
Timer types are a 5 minute timer and a 45 second timer
- When opening any door (door switch is ON), the 5 minute timer starts and then headlamps go out 5 minutes later
- When all the doors are closed (from door switch ON to OFF), the 45 second timer starts and then headlamps go out 45 seconds later. If any door is opened (door switch ON) while the 45 second timer is in operation, the 5 minute timer starts again
- The timer stops when turning on the ignition switch or turning off the auto light switch under the above conditions.

Delay timer control mode can be changed by the function setting of CONSULT-III or display.

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Unit
Refer to LAN-43, "CAN System Specification Chart". CAN System Specification Chart

Major Component and Functions