Audible Warning Device: Description and Operation

The Seat Belt/Ignition Key/Lamps/Turn Signal (Warning) Alarm generates three audible warnings which are: Lights "ON" Warning, Ignition Key Warning and Fasten Belts Warning. Each Warning is a series of pulsed tones or chimes. The Lights "ON" Warning is pulsed approximately once every one half second, sounding the quickest. The Ignition Key Warning is pulsed approximately once every second. The Fasten Belts Warning is pulsed approximately once every 1.5 seconds, sounding the slowest.

Lights "ON" Warning
When the Headlamp Switch is in "PARK" or "HEAD," voltage is applied to the Lights "ON" Input of the Warning Alarm. If the Ignition Switch is turned out of the "RUN" position, voltage is removed from the Ignition Switch Input of the Warning Alarm. When voltage is present at the Lights "ON" Input and no voltage applied to the Ignition Switch Input, the Warning Alarm will sound the Lights "ON" Warning.

Ignition Key Warning
The Warning Alarm applies voltage at all times to the Ignition Key Warning Switch. When the Ignition Key is placed into the Ignition Switch, the Ignition Key Warning Switch is closed. When the LH front door is open, the LH Front Door Jamb Switch closes the circuit to ground. The Warning Alarm senses a voltage drop at the Ignition Key Input and will sound the Ignition Key Warning.

Fasten Belts Warning
The Warning Alarm applies voltage to the Seat Belt Switch at all times. The Warning Alarm senses a voltage drop at the Seat Belt Input through the closed contacts of the Seat Belt Switch when the driver's seat belt is unlatched. When the driver's seat belt is latched, the Seat Belt Switch is opened and the Warning Alarm senses voltage at the Seat Belt Input. When the Ignition Switch is turned to "RUN," voltage is applied to the Warning Alarm Ignition Switch Input. When voltage is present at the Ignition Switch Input and the voltage is zero at the Seat Belt Input, the Warning Alarm will sound the Fasten Belts Warning for 5 to 8 seconds. If voltage is present at both the Ignition Switch Input and the Seat Belt Input, the Warning Alarm will disable the Fasten Belts Warning.

When the Ignition Switch is turned to "RUN," the Warning Alarm senses voltage at the Ignition Switch Input. When voltage is applied to the Ignition Switch Input, the Warning Alarm applies voltage to the Fasten Belts Indicator for 5 to 8 seconds independent of the Seat Belt Switch and Fasten Belts Warning.