If your 2006-2011 Buick Lucerne is acting possessed with a mind of its own—windows that won’t go down, door locks acting erratically, or a security light that prevents it from starting—you’re likely dealing with a failed Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen these exact symptoms countless times. The BCM is the nerve center for your car’s comfort and security features, and when it fails, it can cause a cascade of frustrating electrical problems.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take a high-quality BCM and program it specifically to your vehicle’s VIN using the latest GM software updates. This means you get a module that is ready to install right out of the box, saving you from a costly trip to the dealership for programming. Simply provide your VIN after purchase, and we’ll handle the rest, ensuring a perfect match for your car’s specific options and configuration.
A Technician’s Notebook: The Intermittent Lucerne
I remember a 2009 Lucerne that came into the shop with a ghost of a problem. The owner said sometimes it would start, sometimes it wouldn’t. The power locks would randomly cycle while driving. We checked the battery, starter, and ignition switch—all were fine. No consistent trouble codes were stored. On a hunch, I tapped the passenger side of the dash near the glove box, and the radio flickered. That’s a classic sign. We pulled the BCM, and sure enough, a close inspection revealed corrosion on one of the internal circuit boards from moisture intrusion. A pre-programmed 2006-2011 Lucerne BCM had the car running perfectly in under an hour, solving all the random electrical issues at once.
Common Signs of a Failing BCM
A faulty BCM can manifest in numerous ways. If you’re noticing any of the following, it’s a strong indicator that your Body Control Module needs attention:
- ✔ Erratic power window or door lock operation.
- ✔ Interior or exterior lights staying on or not working at all.
- ✔ The security or anti-theft light is illuminated, causing a no-start condition.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Communication issues with diagnostic scan tools (e.g., U0140 – Lost Communication With Body Control Module).
- ✔ False warnings on the instrument cluster (e.g., ‘Door Ajar’ light).
Your Straightforward Installation Guide
Replacing the BCM in your Lucerne is a manageable job for a DIYer. Here is a general guide to get you through it:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On 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.
- Disconnect the Module: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be pressed to release. Do not force them.
- Swap the Modules: Unbolt or unclip the old BCM and remove it. Mount the new, pre-programmed BCM in its place.
- Reconnect and Reassemble: Plug the wiring harness connectors firmly into the new module until they click. Reinstall the glove box and any other trim pieces you removed.
- Final Steps: Reconnect the battery terminal. Start the vehicle to confirm the fix. Be aware of the potential post-installation procedures noted below.
Important Post-Installation Information
In some cases, additional steps known as ‘relearn’ procedures may be necessary after installation. This is normal and ensures all related vehicle systems communicate correctly with the new BCM.
- Airbag System Sync: If the 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 airbag system with the new BCM.
- Brake Pedal Position Relearn: A brake pedal sensor recalibration might be required on some models to ensure proper brake light and traction control functionality.
Disclaimer: Vehicle systems vary. Always consult a factory service manual or a qualified professional if you are unsure about any step.
Will This Fit My Vehicle?
This BCM is a direct replacement for a wide range of GM vehicles and is guaranteed to be compatible with the following models. It replaces numerous original part numbers, ensuring a reliable fit for your car or truck. Please match your original part number to the list below to confirm compatibility.
Primary Fitment: 2006-2011 Buick Lucerne (BCM located on the right side of the dash)
Interchangeable 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
Frequently Asked Questions
Frequently Asked Questions
Do I need to program this BCM?
No. This Body Control Module comes fully programmed to your vehicle’s specific VIN. This service is included in the price and saves you a trip to the dealership.
Why do you need my vehicle’s VIN?
The VIN (Vehicle Identification Number) allows us to access the exact factory configuration for your car, including options like sunroof, power seats, and security system. Programming the BCM with this data ensures all features work correctly upon installation.
Where is the BCM located on my 2008 Lucerne?
The BCM on a 2006-2011 Buick Lucerne is located behind the dashboard on the passenger side. You will typically need to remove the glove box to access it.
What if the airbag light comes on after I install it?
This is an infrequent but possible occurrence. It means the new BCM needs to be electronically ‘introduced’ to the airbag’s computer (SDM). This requires a ‘Setup SDM Primary Key’ procedure with a bi-directional scan tool, which a professional mechanic can perform.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module, so there’s nothing you need to send back to us.
Will this fix my car’s no-start problem?
If your no-start issue is caused by the factory anti-theft system (often indicated by a flashing security light), then replacing the BCM is very likely the correct fix. The BCM is a central part of that system.