Audible Warning Device: Description and Operation

The Audible Warnings System is controlled by the Multi-function Alarm Module and sounds a chime to bring attention to several conditions. These conditions are:
1. Key is in the Ignition Cylinder (with door open).
2. Seat Belt is not fastened.
3. Headlights are on (with door open).
4. Turn signal is on.
The Multi-function Alarm Module also controls a battery run-down protection feature.

Key-In-Ignition Chime
Voltage is applied at all times to Conn C2 term "D" of the Multi-function Alarm Module through Fuse 11. When the key is in the ignition and LH front door is open, Conn C1 term "H" and term "E" of the Multi-function Alarm Module are grounded. This sounds the chime.

Fasten Belts Chime
With the Ignition Switch in "RUN," "BULB TEST" or "START," voltage is applied through Fuse 9 to Conn C1 term"M" of the Multi-function Alarm Module. With the LH front seat belt unbuckled, Conn C1 term "K" of the Multi-function Alarm Module is grounded through the Seat Belt Switch. The fasten belts chime sounds for 4 to 8 seconds. The Fasten Belts Indicator operates for 20 seconds and then flashes for an additional 55 seconds.

Fasten Belts Indicator
The Fasten Belts Indicator is also controlled by the Multi-function Alarm Module. The indicator will light:
^ For 20 seconds and then flashes for an additional 55 second, after the ignition is turned on if the doors are closed.
^ Any time the Seat Belt Retractors are energized by a door opening and the Ignition Switch is in "RUN," "BULB TEST" or "START."
^ If there is a fault detected in the Seat Belt Retractor Solenoids circuit.

Light-On Chime
The Multi-function Alarm Module sounds the Lights-on chime when the following three conditions are met:
1. Battery voltage at Conn C1 terminal "D" indicates that the Park or Headlights are on.
2. 0 volts at Conn C1 terminal "M" indicates that the Ignition Switch is in "OFF," "ACCY," or "LOCK."
3. Ground at Conn C1 terminal "H" indicates that the LH door is open.

Battery Run Down Protection
The Battery Run Down Protection feature is made up of two independent features: the Parasitic Power Control, the Inadvertent Power Control, and the Courtesy Lights Control.

Parasitic Power Control
The Parasitic Power Control output of the Multi- function Alarm Module supplies voltage to the Electronic Brake Control Module (EBCM), Instrument Cluster and Radio. The output timer will shut off power to all of the above components when one of these two conditions occurs:
^ Vehicle travels for less than 15 miles since battery power is applied to the Multi-function Alarm Module and is parked for 3 days following the last ignition cycle.
^ Vehicle travels for more than 15 miles since battery power is applied to the Multi-function Alarm Module and is parked for 24 days following the last ignition cycle.

Inadvertent Power Control
The Inadvertent Power Control output of the Multi- function Alarm Module supplies voltage to these lights: Courtesy, Header, Rear Quarter, Vanity Mirror, Reading, I/P Compartment and Luggage Compartment. For more information, Refer to Interior Lights (Refer to Lighting and Horn). Lighting and Horns

Power Output Diagnostic Mode
There is a Power Output Diagnostic Mode in the Multifunction Alarm Module that can be used to run a quick check on the operation of the Parasitic Power Control, the Courtesy Lights Control and Inadvertent Power Control outputs. It is activated after all of the following actions have been performed:
^ Turn Interior Lights on using Panel Dimmer Switch
^ Close all doors.
^ Turn on Radio.
^ Turn Ignition Switch to "RUN" and, before 15 seconds pass, perform these steps:
- Open the RH front door.
- Cycle the Headlight Switch from "PARK" to "OFF" 3 times.

During normal operation (no trouble found), the Muti-function Alarm Module will flash the interior lights for approximately 1 minute and return to normal operation. In the event of a short found in the inadvertent output circuit (CKT 1733), the module will chime as follows:
1. Chime every 3 seconds - Inadvertent output failure
2. Chime every 3 seconds - Courtesy output failure
3. Chime every 3 seconds - Parasitic output failure

NOTE: The Multi-function Alarm Module can now be reset by a battery disconnect. This can be accomplished by removing Fuse 11.

Additional Features
The Multi-function Alarm Module also controls the Seat Belt Retractor Solenoids, Illuminated Entry features and Automatic Door Lock. Refer to Lighting and Horns, Lock,Door, Seat Belts for further information. Lighting and Horns Body and Frame Restraints and Safety Systems