Pontiac Fiero 1988 Service Manual page 1072

W A R N I N G S A N D A L A R M S : C H I M E
-M^
CIRCUIT OPERATION
The Audio Alarm System calls attention to
several conditions by sounding a built-in chime.
These conditions are: 1) the LH front seatbelt Is
not buckled; 2) the key is In the Ignition and the
LH front door Is open, 8) the lights are on and
the Ignition Switch is not in RUN, BULB
TEST or START and 4) the Parking Brake is
applied and the Ignition Switch is in RUN,
BULB TEST or START.
Battery voltage to operate the module is sup-
plied at all times to terminal B. Voltage is also
applied to two other inputs. One of these, at ter-
minal A receives voltage from the Instrument
Panel Lights whenever the Headlights or PARK
Lights are on. The other, at terminal E receives
voltage in RUN, BULB TEST, or START.
To sound the Seatbelt Warning, two inputs to
the module must be present: 1) battery voltage
at the Ignition Input, and 2) a ground at the
Fasten Belts Input. This occurs when the Seat-
belt Switch is closed and because the LH front
seatbelt is not buckled. While the slow chime
sounds, the module also supplies steady bat-
tery voltage to the Fasten Belts Output to light
the Fasten Belts Indicator.
To sound the Key In Ignition Warning, both
the Ignition Key Warning Switch and the LH
Front Door Jamb Switch must be closed. This
condition grounds terminal C of the Audio Alarm
Module. These switches are closed when the LH
front door is open and the key is in the ignition.
The Lights-On Warning sounds when voltage
is present at the Lights-On Input, and not present
at the Ignition Switch Input. If either of these
changes (lights OFF or ignition ON), the fast
pulsed Lights-On chime will stop. When the dim-
mer is at a dim setting, the alarm will not be
activated since there is not enough voltage at the
Lights-On Input.
The Parking Brake Warning sounds when the
Parking Brake is applied, and the Ignition
Switch is in RUN. Once the brake is released,
the chime will stop.