GM Service Manual Online
For 1990-2009 cars only

Body Control Module (BCM)

The Body Control Module (BCM) controls the audible warnings. Refer to Body Control System Circuit Description in Body Control System for more information regarding the BCM.

Diagnostic Trouble Codes (DTCs)

The BCM may set these DTCs related to audible warnings:

    •  DTC B2602 DRL Circuit Open or Shorted to Ground
    •  DTC B2603 DRL Circuit Shorted to B+
    •  DTC B2961 Key In Ignition Circuit Malfunction

Refer to Body Control Module Diagnostic Information regarding these DTCs.

Audible Warnings

The Body Control Module (BCM) controls these reminders:

    • Key in ignition reminder: An audible warning intended to remind the driver that the key has been left in the ignition cylinder. The BCM sounds the chime for this reminder at a rate of 150 chimes per minute.
    • Fasten seat belt reminder: An audible warning intended to remind the driver at the beginning of the driving cycle that the driver's seat belt is unfastened. The BCM sounds the chime for this reminder at a rate of 50 chimes per minute.
    • Fasten belts indicator control: A visual warning intended to remind the driver that the driver's seat belt is unfastened.
        The BCM sounds the chime for this reminder at a rate of 50 chimes per minute.
    • Fasten belts indicator control: A visual warning intended to remind the driver that the driver's seat belt is unfastened.
    • Parking brake reminder: An audible warning intended to remind the driver that the parking brake has been left applied with the transaxle shifted out of PARK.
        The BCM sounds the chime for this reminder at a rate of 200 chimes per minute.
    • Turn signal reminder: An audible warning intended to remind the driver that the turn signal has been left on while the vehicle has traveled over 1.2 km (3/4 mile).
        The BCM sound this chime for this reminder at a variable rate (in unison with turn lamps on) of (90 chimes per minute.
    • Low fuel reminder: An audible warning intended to attract the driver's attention to the instrument cluster when the Low Fuel lamp turns on. The BCM sounds the chime once every 10 minutes for this reminder.
    • Headlamps ON reminder: An audible warning intended to remind the driver that the headlamps have been left on. The BCM sounds the chime for this reminder at a rate of 200 chimes per minute.
    • Last door closed locking confirmation: An audible warning intended to provide the driver feedback that the last door closed locking feature is active. The BCM sounds the chime for this reminder at a rate of 200 chimes per minute.
    • Feature customization and diagnostic feedback: An audible feedback used when changing feature customization modes. The BCM sounds the chime during feature customization.

Key in Ignition Reminder

The BCM sounds the key in ignition reminder when these conditions are met:

  1. The driver's door is open (ground signal in circuit 49).
  2. The key is fully inserted in the ignition cylinder (ground signal in circuit 80).
  3. The ignition switch in the LOCK, OFF, OR ACC position.

Fasten Seat Belt Reminder

The BCM sounds the fasten seat belt reminder ON for 6 (+/- 2) seconds when these conditions are met:

    • The ignition switch is turned form LOCK or OFF to RUN, or from CRANK to RUN.
    • The driver's seat belt is unfastened (ground signal in circuit 238).

If the driver's seat belt is fastened, then unfastened within 6 second chime period, the BCM stops the chime while the driver's seat belt is fastened. The BCM resumes the chime for reminder of 6 second period if the driver's seat belt is unfastened.