Grand Prix V6-3.8L SC VIN 1 (1997)
Audible Warning Device: Description and Operation
The Body Control Module (BCM) generates audible warnings for four conditions: Headlamps "ON" Warning, Ignition Key Warning, Fasten Belts
Warning and a fourth warning for Turn Signals "ON." The Headlamps "ON" Warning and Turn Signal Warning are pulsed approximately once every
one half second, sounding the quickest. The Ignition Key Warning is pulsed once every second. The Fasten Belts Warning is a continuous tone.
Headlamps "ON" Warning
When the Headlamp Switch is in "PARK" or "HEAD," voltage is removed to the Lamps "OFF" Input of the BCM. When the Ignition Switch is
turned out of the "RUN" position, voltage is removed from the Ignition Switch Input of the BCM. When voltage is removed at the Lamps "OFF"
Input and no voltage applied to the Ignition Switch Input, the BCM will sound the Lamps "ON" Warning.
Ignition Key Warning
The BCM applies voltage at all times to the Ignition Key Alarm Switch. When the Ignition Key is placed into the Ignition Switch, the Ignition Key
Alarm Switch is closed. When the LH front door is open, the LH Front Door Ajar Switch closes the circuit to ground. The BCM senses a voltage
drop at the Ignition Key Input and will sound the Ignition Key Warning.
Fasten Belts Warning
The BCM applies voltage to the Seat Belt Switch at all times. The BCM 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 BCM
senses voltage at the Seat Belt Input. When the Ignition Switch is turned to "RUN," voltage is applied to the BCM Ignition Switch Input. When
voltage is present at the Ignition Switch Input and zero volts at the Seat Belt Input, the BCM will sound the Fasten Belts Warning for 4 to 8
seconds. If voltage is present at the Ignition Switch Input and the Seat Belt Input, the BCM will disable the Fasten Belts Warning.
Turn Signal Warning Chime
When a turn signal is operated, voltage is alternately applied and removed to BCM connector C2, terminal "C12" (Right Turn Signal) and "C14"
(Left Turn Signal). The module begins to monitor vehicle distance at connector C2, terminal "C15". If the Turn Signal is still flashing after the
vehicle has traveled 0.8 kilometers (0.5 miles), the Turn Signal Warning chime will sound.
