System Outline

Current always flows to TERMINAL 8 of the door lock control relay through the DOOR fuse.
When the ignition SW is turned ON, the current flowing through the ECU-IG fuse flows to TERMINAL 1 of the door lock control relay --> TERMINAL 15 --> the power main relay (coil side) GROUND. As a result, the current flowing through the PWR fuse flows to the power main relay (point side) --> TERMINAL 8 of the door lock control SW LH --> TERMINAL 4 --> GROUND, causing the indicator light to light up.

1. MANUAL LOCK OPERATION
When the door lock control SW or door key lock and unlock SW are pushed to LOCK position, a lock signal is input to TERMINAL 10 or 12 of the door lock control relay and causes the relay to function. Current flows from TERMINAL 8 of the relay --> TERMINAL 4 --> TERMINAL 4 of the front door lock motors, TERMINAL 2 of the rear door lock motors, --> TERMINAL 2 of the front door lock motors, TERMINAL 1 of the rear door lock motors --> TERMINAL 3 of the relay --> TERMINAL 16 --> GROUND and the door lock motor causes the door to lock.

2. MANUAL UNLOCK OPERATION
When the door lock control SW or door key lock and unlock SW are pushed to UNLOCK position, an unlock signal is input to TERMINAL 11 or 13 of the door lock control relay and causes the relay to function. Current flows from TERMINAL 8 of the relay --> TERMINAL 3 --> TERMINAL 2 of the front door lock motors. TERMINAL 1 of the rear door lock motors --> TERMINAL 4 of the front door lock motors, TERMINAL 2 of the rear door lock motors --> TERMINAL 4 of the relay --> TERMINAL 16 --> GROUND and door lock motors causes door to unlock.

3. DOUBLE OPERATION UNLOCK OPERATION
When the door key lock and unlock SW LH is turned to the unlock side, only the driver's door is mechanically unlocked. Turning the door key lock and unlock SW LH to the unlock side causes a signal to be input to TERMINAL 9 of the relay, and if the signal is input again within 3 seconds by turning the SW to the unlock side again. current flows TERMINAL 3 --> TERMINAL 2 of the front door lock motors, TERMINAL 1 of the rear door lock motors --> TERMINAL 4 of the front door lock motors, TERMINAL 2 of the rear door lock motors --> TERMINAL 4 of the relay --> TERMINAL 16 --> GROUND, causing the door lock motors to operate and unlock the doors.

4. IGNITION KEY REMINDER OPERATION
* Operating door lock knob (operation of door lock motors)
With ignition key in cylinder (unlock warning SW ON), when the door is opened and locked using door lock knob (door lock motor), the door is locked once but each door is unlocked soon by the function of relay. As a result, the current flows from TERMINAL 8 of the relay --> TERMINAL 3 --> TERMINAL 2 of the front door lock motors, TERMINAL 1 of the rear door lock motors --> TERMINAL 4 of the front door lock motor, TERMINAL 2 of the rear door lock motors --> TERMINAL 4 of the relay --> TERMINAL 16 --> GROUND and causes all the doors to unlock.

* Operating door lock control SW or door key lock and unlock SW
With ignition key in cylinder (unlock warning SW ON), when the door is opened and locked using door lock control SW or key SW, the door is locked once but each door is unlock by the function of SW contained in motors, which the signal is input to TERMINAL 6 (driver's) or 5 (passenger's) of the relay. According to this input signal, the current in ECU flows from TERMINAL 8 of the relay --> TERMINAL 3 --> TERMINAL 2 of the front door lock motors, TERMINAL 1 of the rear door lock motors --> TERMINAL 4 of the front door lock motors, TERMINAL 2 of the rear door lock motors --> TERMINAL 4 of the relay --> TERMINAL 16 --> GROUND and causes all the door to unlock.

* In case of key less lock
With ignition key in cylinder (unlock warning SW ON), when the unlock function is disturbed more than 0.2 seconds, for example pushing the door lock knob etc.. the door holds on lock condition. Closing the door after, door courtesy SW inputs the signal into TERMINAL 2 or 14 of the relay. By this input signal, the ECU works and current flows from TERMINAL 8 of the relay --> TERMINAL 3 --> TERMINAL 2 of the front door lock motor, TERMINAL 1 of the rear door lock motors --> TERMINAL 4 of the front door lock motors, TERMINAL 2 of the rear door lock motors --> TERMINAL 4 of the relay --> TERMINAL 16 --> GROUND and causes all the doors to unlock.