GM Service Manual Online
For 1990-2009 cars only

This vehicle is equipped with 1 of 3 types of BCM types. The BCM type installed on this vehicle is based on the vehicle equipment content and options. The following are the 3 types:

    • BCM type 2
    • BCM type 3
    • BCM type 4

BCM Type 2

The BCM type 2 has the following features:

    • Retained accessory power (RAP)
    • Audible warnings
    • Interior lighting
    • Automatic power doors locks

BCM Type 3

Vehicles with RPO AU0 are equipped with a BCM type 3. The BCM type 3 has the following features:

The BCM type 3 has the following features:

    • Retained accessory power (RAP)
    • Audible warnings
    • Interior lighting
    • Automatic power doors locks
    • Keyless entry

BCM Type 4

Vehicles with RPO AU0 and UA6 are equipped with a BCM type 4. The BCM type 4 has the following features:

    • Retained accessory power (RAP)
    • Audible warnings
    • Interior lighting
    • Automatic power doors locks
    • Keyless entry
    • Content theft deterrent (CTD)

Body Control Module (BCM) Features

Based on the vehicle equipment/options, the body control module (BCM) controls these vehicle systems:

    • The retained accessory power
    • The audible warnings
    • The interior lighting
    • The automatic door locks
    • The keyless entry (BCM types 3 and 4)
    • The content theft deterrent (BCM type 4)

Retained Accessory Power (RAP)

The retained accessory power (RAP) feature allows the operation of the following optional equipment for 10 minutes or until a vehicle door opens after the ignition switch has been turned from the RUN or ACC to the OFF or UNLOCK position:

    • The radio
    • The power windows
    • The power mirrors
    • The power sunroof, if equipped

Audible Warnings

The following components are equipped with audible warnings:

    • The key in the ignition reminder
    • The fasten seat belt reminder
    • The fasten belts indicator control
    • The turn signal reminder
    • The driver information display reminder
    • The trip calculator reminder
    • The headlamps ON reminder
    • The last door closed locking confirmation
    • The feature customization and diagnostics feedback

Interior Lighting

The following areas have the interior lighting:

    • The interior illumination control
    • The delayed illumination
    • The exit illumination
    • The theatre dimming
    • The door key unlock illumination (BCM type 4 only)
    • The keyless entry unlock illumination (BCM type 3 and 4 only)
    • The inadvertent load (battery rundown) protection
    • The feature customization of the following features:
       - Interior lighting modes
       - Delayed illumination
       - Exit lighting

Automatic Door Locks

BCM type 2 has the following automatic door lock features:

    • All door unlock
    • All door lock
    • Last door closed locking
    • Lockout prevention
    • Lockout prevention override
    • Ignition OFF unlock
    • Shift into PARK unlock
    • Shift out of PARK lock

BCM type 3 has the following automatic door lock features in addition to the BCM type 2 features:

    • Remote driver door unlock
    • Remote all door unlock
    • Remote all door lock

BCM type 4 has the key cylinder unlock automatic door lock feature in addition to the BCM types 2 and 3 features.

The BCM provides the feature customization of the following door lock functions:

    • Shift out of PARK lock
    • Ignition OFF unlock
    • Shift into PARK unlock
    • Last door closed locking
    • Lockout prevention

Keyless Entry

BCM type 3 provides the following keyless entry features:

    • Remote driver door unlock
    • Remote all door unlock
    • Remote all door lock
    • Remote activation verification (BCM type 4)
    • Remote alarm (BCM type 4)
    • Feature customization of the remote unlock control and remote activation verification

Content Theft Deterrent

BCM type 4 features a content theft deterrent system (CTD). The CTD is designed to deter vehicle vandalism and theft. The content theft deterrent system performs the following functions:

    • Flashes the headlamps
    • Sounds the horn

The BCM monitors the status of the following components:

    • The doors
    • The lock cylinders
    • The rear compartment lid
    • The shock sensor
    • The power door locks
    • The keyless entry system

The BCM operates the following components, depending on the mode:

    • The headlamps
    • The horn
    • The theft deterrent indicator lamp

The BCM also provides feature customization of the following features:

    • The theft deterrent
    • The shock sensor
    • The arm/disarm modes