System Outline

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 ECU operates the key confinement prevention function while the key unlock warning switch is ON.

Current always flows to TERMINAL 1 to the integration relay through the DOME fuse.

1. SEAT BELT WARNING SYSTEM
When the ignition SW is turned ON, current flows from the GAUGEfuse to TERMINAL 7 of the integration relay. At the same time, current flows to TERMINAL 9 of the integration relay from the GAUGE fuse through the seat belt warning light. Then, if the driver's seat belt is not fastened (A retractor SW OFF signal is input to TERMINAL 8 of the integration relay), the current flowing through the warning light flows from TERMINAL 9 of the integration relay to TERMINAL 10 to GROUND, and flashes the warning light. The current flowing to TERMINAL 1 of the integration relay also flows from TERMINAL 10 to GROUND and the seat belt warning buzzer sounds for approx. 6 seconds. However, if the seat belt is put ON during this period (While the buzzer is sounding), signal input to TERMINAL 8 of the integration relay stops, and the current flowing from TERMINAL 1 of the integration relay to TERMINAL 10 to GROUND is cut, causing the buzzer to stop.

2. KEY REMINDER SYSTEM
With the ignition key inserted in the key cylinder (Unlock warning SW ON), the ignition SW still OFF and driver's door open (Door courtesy SW ON), when a signal is input to TERMINAL 6 of the integration relay, the integration relay operates, the current flows from TERMINAL 1 of the integration relay to TERMINAL 10 to GROUND and the key reminder buzzer sounds.