Here's some info for you:
BTW - it's located behind the r/s console trim panel. Not under the glovebox, but inside the console.
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Service Information 2004 Chevrolet Malibu | Malibu (VIN Z) Service Manual | Document ID: 2368993
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#09-08-47-002: Information on Body Control Module (BCM) Functionality Across Vehicle Lines - (Nov 17, 2009)
Subject: Information on Body Control Module (BCM) Functionality Across Vehicle Lines
Models: 2004-2010 Chevrolet Malibu
2008 Chevrolet Malibu Classic
2005-2010 Chevrolet Cobalt
2006-2010 Chevrolet HHR
2005-2009 Pontiac G6
2006-2009 Pontiac Solstice
2007-2009 Saturn AURA, SKY
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The purpose of this bulletin is to address the unique differences in Body Control Module (BCM) functionality of the affected vehicles. Many electrical functions on these vehicles do not directly involve the BCM, even though they may on other vehicles. The cooling fans, for example, are controlled by the engine control module (ECM) on the Malibu, but are controlled by the BCM on the Impala. The BCM is primarily a gateway between the high- and low-speed GMLAN serial data buses on the above listed vehicles.
Functions That Do Not Involve the BCM
The following list of features and functions are not controlled or dependent on the BCM:
Important: The BCM should NOT be replaced for conditions in these areas.
• Cooling fans
• Clock display
• Radio display
• Power mirrors
• OnStar®
• Rear wiper (on Malibu Maxx)
• Warning lamps
• Malfunction indicator lamp (MIL)
• Driver seat belt reminder light and chime
• Power windows
Important: The BCM also acts as a power distribution center and may provide a fused battery feed to the modules that actually do control the above functions.
Do not assume a similar control module issue will apply to different vehicle lines. Refer to SI for the appropriate description and operation and diagnostic information.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
© 2010 General Motors. All rights reserved.
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Service Information
2004 Chevrolet Malibu | Malibu (VIN Z) Service Manual | Document ID: 1237803
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Body Control Module Replacement
Removal Procedure
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
Remove the right console trim panel. Refer to Front Floor Console Side Trim Panel Replacement - Right Side .
Remove the body control module (BCM) screws.
Remove the BCM wire harness connectors.
Remove the BCM.
Installation Procedure
Install the BCM.
Install the BCM wire harness connectors.
Notice: Refer to Fastener Notice in the Preface section.
Install the BCM screws.
Tighten
Tighten the screws to 2.5 N·m (22 lb in).
Install the right console trim panel. Refer to Front Floor Console Side Trim Panel Replacement - Right Side .
Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
For a new or remanufactured BCM, setup the BCM. Refer to Control Module References .
© 2010 General Motors. All rights reserved.