Circuit Description

This circuit provides power to operate the body ECU.

When the ignition switch is turned to the ON position, battery positive voltage is applied to terminal IG of the body ECU.

The key unlock warning switch goes on when the ignition key is inserted in the key cylinder and goes off when the ignition key is removed.

The body ECU operates the key confinement prevention function while the key unlock warning switch is on.

This circuit detects the state of the power window control switch.

When the door switch is set to LOCK, the body ECU outputs a signal to lock all of the doors.

The door unlock detection switch is built in the door lock motor assembly. This switch is ON when the door lock knob is in the unlock position and OFF when the lock knob is in the lock position. The body ECU detects the door lock knob conditions in this circuit. It is used as one of the operating conditions for the key confinement prevention function.

The door key lock and unlock switch is built in the door key cylinder. When the key is turned to the lock side, terminal 4 of the switch is grounded and when the key is turned to the unlock side, terminal 3 of the switch is grounded.

The door lock control switch is ON when the door lock knob is in the lock position and OFF when the lock knob is in the unlock position.

The door courtesy switch goes on when the door is opened and goes off when door is closed.