GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Firebird 🢒 Body and Accessories 🢒 Keyless Entry 🢒 Audible Warnings Circuit Description

Circuit Operation

The body control module generates a chime in order to provide the following warnings:

    • Lights on
    • Ignition key
    • Fasten seat belt

Lights On Warning

The body control module (BCM) will sound the lights on warning when the BCM senses all of the following conditions:

    • The ignition switch is in the OFF, LOCK or ACCY position. There is no voltage at circuit 39 to the BCM ignition positive voltage input.
    • The park lamps or headlamps are on. Voltage is applied through circuit 9 to the BCM park lamps input.
    • The driver door is open. Ground is applied from G200 through circuit 750, the left side door lock and circuit 745 to the BCM driver door open input.

Ignition Key Warning

The Body Control Module (BCM) will sound the ignition key warning when the BCM senses all of the following conditions:

    • The ignition switch is in the OFF, LOCK or ACCY position. There is no voltage at circuit 39 to the BCM ignition positive voltage input.
    • The ignition key is in the ignition switch. Ground is applied from G200 through circuit 650, the ignition key warning switch and circuit 80 to the BCM key ignition signal input.
    • The driver door is opened. Ground is applied from G200 through circuit 750, the left side door lock and circuit 745 to the BCM driver door open input.

Fasten Belts Warning

The body control module (BCM) will sound the fasten belts warning for 4-8 seconds and illuminate the fasten seat belt indicator when the BCM senses both of the following conditions:

    • The ignition switch is in the RUN, BULB TEST or START position. Voltage is applied through circuit 39 to the BCM ignition positive voltage input.
    • The driver's seat belt is unbuckled. Ground is applied from G200 through circuit 650, the seat belt switch and circuit 238 to the BCM seat belt switch signal input.

If the driver seat belt is buckled before the ignition switch is turned to the RUN, BULB TEST or START positions the following situations will occur:

    • The fasten seat belt warning will be disabled.
    • The fasten seat belt indicator will not illuminate.

If the driver seat belt is unbuckled, the fasten seat belt indicator will remain ON for approximately 70 seconds. The indicator turns off immediately if the seat belt is buckled.