Restore Full Electrical Function to Your Buick Lucerne
Are you chasing electrical gremlins in your 2006-2011 Buick Lucerne? Intermittent power windows, flickering dash lights, a security system that acts up, or strange warning messages can all point to one culprit: a failing Body Control Module (BCM). The BCM is the central command for your vehicle’s comfort and convenience features. When it fails, it can make driving frustrating and unpredictable. This isn’t just an inconvenience; it can affect systems tied to your vehicle’s safety and security.
Forget the expensive dealership visit and the hassle of finding a shop with the right programming tools. We offer a direct, reliable solution. This Body Control Module, compatible with part number 20921435, arrives at your door pre-programmed with the latest GM software, specifically matched to your car’s VIN. This means you get a component that’s ready for installation right out of the box, restoring the seamless operation you expect from your Lucerne.
Case Study: A Tricky Diagnosis
A customer brought in a 2009 Lucerne with a classic BCM failure story. The radio would turn off randomly, the driver’s side power lock was dead, and the anti-theft light would flash, sometimes preventing the car from starting. They had already replaced the battery and checked fuses. After connecting my scan tool, I found multiple U-codes (communication loss) pointing to the BCM. Over my 20 years as a technician, I’ve seen hundreds of these cases. The internal circuit boards on these modules can develop micro-fractures from years of heat cycles and vibration, leading to these exact unpredictable issues. A direct, correctly programmed replacement is the only permanent fix.
Is Your Lucerne Showing These Signs of BCM Failure?
A faulty BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your Body Control Module needs attention:
- ✔ Erratic or non-functional power windows, door locks, or interior/exterior lights.
- ✔ The security or anti-theft system light is on, or the vehicle won’t start.
- ✔ The key fob works intermittently or not at all.
- ✔ The horn sounds at random or doesn’t work when pressed.
- ✔ False warnings on the instrument cluster (e.g., ‘Door Ajar’).
- ✔ Diagnostic trouble codes (DTCs) related to communication loss, such as U0140, U0155, or other U-codes.
- ✔ Wipers or radio functioning improperly.
A Straightforward Guide to Installation
Replacing the BCM in your Lucerne is a manageable job for a confident DIYer. In the 2006-2011 Lucerne, the BCM is located behind the glove box on the right side of the dash.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to ensure all systems are powered down.
- Access the Module: Open the glove box. You may need to press in on the sides to release the retaining stops, allowing it to swing down completely for access to the area behind it.
- Locate the BCM: Identify the old Body Control Module. It’s a plastic box with several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug all electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt the module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Final Steps: Re-secure the glove box and reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions (lights, locks, windows, etc.).
Important Post-Installation Information
Because this BCM is pre-programmed, most functions will work immediately. However, depending on your vehicle’s specific configuration, a couple of simple relearn procedures may be needed. This is normal when replacing a central computer.
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration to ensure proper brake light and traction control operation.
Verified Vehicle Compatibility
This module is a direct replacement for the 2006-2011 Buick Lucerne. It is also a compatible replacement for a wide range of other GM vehicles and supersedes numerous part numbers, ensuring broad applicability. If your original part number is on this list, this module will work for you.
Compatible Part Numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084
Fits select models of: Acadia, Avalanche, Caprice, Captiva Sport, CTS, DTS, Enclave, Equinox, Escalade, Express, G8, Hummer H2, Impala, Monte Carlo, Outlook, Savana, SRX, STS, Suburban, Tahoe, Torrent, Traverse, Vue, Yukon, and more. Always verify your part number before ordering.
We use your Vehicle Identification Number (VIN) to program the BCM with the exact software and calibrations specific to your 2006-2011 Lucerne’s options. This ensures all features work correctly and makes the installation process as simple as possible, eliminating the need for dealer programming.
For someone with basic mechanical skills, this is a very manageable job. The BCM is typically located behind the glove box and requires only simple hand tools to access and replace. Our pre-programming service handles the most complex part of the job for you.
This is a possibility and is related to vehicle security protocols. The new BCM needs to be electronically ‘introduced’ to the airbag’s computer (SDM). This requires a ‘Setup SDM Primary Key’ procedure, which can be done by any professional mechanic with a capable bi-directional scan tool.
No. We do not require a core return for this part. You can keep your original module, which saves you the time and expense of return shipping.
This part is guaranteed to fit the 2006-2011 Buick Lucerne. The best way to ensure 100% compatibility is to match the part number from your original BCM to the extensive list of compatible part numbers provided in our description.