Restore Your Buick’s Electrical System with a Pre-Programmed BCM

If your 2006-2011 Buick Lucerne is suffering from baffling electrical issues, a failing Body Control Module (BCM) is the likely culprit. As the central command center for your vehicle’s comfort and security features, a faulty BCM can cause a cascade of problems that are frustrating to diagnose and even more frustrating to live with. This isn’t just a replacement part; it’s a complete, ready-to-install solution. We perform a cloning service, programming this module with the latest GM software updates specific to your car’s Vehicle Identification Number (VIN). This eliminates the need for expensive dealership programming, saving you time and money.

Is Your Lucerne Showing These Symptoms?

A failing BCM doesn’t always trigger a check engine light. Instead, look for these common signs of failure:

• ✔ Power windows, mirrors, or door locks working intermittently or not at all.
• ✔ Interior or exterior lights flickering, staying on, or not turning on.
• ✔ The security system acting up, causing no-start conditions or false alarms (“Service Theft System” message).
• ✔ Unexplained battery drain that leaves you with a dead battery overnight.
• ✔ Inconsistent or non-functional climate controls.
• ✔ Diagnostic trouble codes (DTCs) related to communication loss, such as U0140, U0155, or other U-codes.

Your Straightforward BCM Installation Guide

Installing your programmed 2006-2011 Lucerne BCM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a smooth installation.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow all modules to power down completely.
2. Locate the BCM: In the 2006-2011 Buick Lucerne, the Body Control Module is typically located behind the right side of the dashboard, accessible by removing the glove box assembly.
3. Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
4. Install the New Module: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You should hear a ‘click’ as they lock into place.
5. Reconnect and Test: Reinstall the glove box, then reconnect the negative battery terminal. Turn the key to the ‘On’ position (without starting the engine) and test all body functions—windows, locks, lights, radio, etc.
6. Perform Relearn Procedures: If the airbag light is on or the brake lights are not functioning correctly, proceed with the necessary post-installation relearn procedures outlined below.

Important Post-Installation Steps

While our cloning service makes this a near plug-and-play repair, some vehicle systems may require recalibration after the BCM is replaced. Please be aware of the following potential requirements:

• Airbag System Sync: If the airbag warning light is illuminated after installation, it means the new BCM needs to be synced with the airbag’s computer (SDM). This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. This is only necessary if the light is on.
• Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn is needed to ensure your brake lights and traction control system function as intended. This may also require a capable diagnostic tool.

Disclaimer: Specific procedures can vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.

Verified Vehicle Compatibility

This BCM is a direct replacement for part number 20921435 and a wide range of other original part numbers. It fits the following vehicles, but please verify your part number or contact us with your VIN to ensure perfect compatibility.