Audible Warning Device: Description and Operation

IGNITION KEY WARNING ALARM
Battery voltage is applied at all times through the DOME Fuse to the Ignition Key Warning Switch. When the ignition key is inserted into the Ignition Cylinder, the Ignition Key Warning Switch closes and a voltage signal is provided to the Audio Alarm Module. If the LH Front Door is opened, the LH Front Door Jamb Switch 'loses and provides a ground signal to the Audio Alarm Module. When these two signals are received, the Audio Alarm Module activates the ignition key warning alarm (approximately two pulses per second). The alarm will continue to sound until either the ignition key is removed from the Ignition Cylinder or the LH Front Door is closed. The alarm will stop if the Audio Alarm Module receives an ignition ON signal from the IG-COIL Fuse when the LH Front Door is open.

HEADLIGHT WARNING ALARM
The headlight warning alarm will sound if the Light Switch is in the PARK or HEAD position, with the ignition key removed from the Ignition Cylinder and the LH Front Door open. Voltage is applied at all times through the TAIL Fuse to the Light 1 Relay. When the Light Switch is in the PARK or HEAD position, ground is supplied to the coil of Light 1 Relay. This energizes the coil and closes the contacts allowing voltage to be applied through Light 1 Relay to the Audio Alarm Module. With the LH Front Door open, a ground signal is provided through the LH Front Door Jamb Switch to the Audio Alarm Module. When both of these signals are received, the Audio Alarm Module activates the headlight warning alarm (approximately one pulse per second). The alarm will continue to sound until either the Light Switch is turned "OFF," the LH Front Door is closed, or the Ignition Switch is turned to "ON."

SEAT BELT WARNING ALARM
The Seat Belt Warning Alarm (approximately two pulses per second) is activated when the following conditions are met: the Ignition Switch is in the "ON" position and the LH Front Seat Belt is unbuckled. The Audio Alarm Module applies and monitors battery voltage across a fixed resistor to the Seat Belt Switch. When the LH Front Seat Belt is unbuckled, the voltage being monitored at the Audio Alarm Module is high, thus indicating that the LH Front Seat Belt is unbuckled. The alarm will sound for approximately six seconds if the LH Front Seat Belt is not buckled. If at any time, the LH Front Seat Belt is buckled while the Audio Alarm Module is sounding, the alarm will stop.

The Seat Belt Indicator works in conjunction with the Seat Belt Warning Alarm. The Seat Belt Indicator is supplied ignition voltage through the IG-COIL Fuse. If the LH Front Seat Belt is unbuckled, then ground is supplied from G400 through the closed contacts of the Seat Belt Switch to the Seat Belt Indicator. The Seat Belt Indicator will remain lit until the LH Front Seat Belt is buckled.