Restore Control and End Electrical Frustration in Your Buick
If your 2006-2011 Buick Lucerne is acting possessed—with flickering dash lights, power windows and locks with a mind of their own, or a security system that randomly prevents the car from starting—you’re not alone. These chaotic electrical issues almost always point to a single component: a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen how a faulty BCM can turn a reliable car into a source of daily frustration. It’s the central hub for all your car’s comfort and security electronics, and when it goes, it takes them all down with it.
This isn’t just about convenience; a failing BCM can impact safety systems and leave you stranded. The solution is a reliable replacement, but traditionally, that meant a costly tow to the dealership for installation and programming. We eliminate that hassle. This replacement 2006-2011 Lucerne Body Control Module arrives at your door fully programmed to your vehicle’s specific VIN. Just provide us with your VIN after purchase, and we’ll load the latest GM software, making this a true plug-and-play solution for the confident DIYer or professional mechanic.
From the Diagnostic Bay: The Ghost in the Lucerne
I remember a 2009 Lucerne that came into my shop with a laundry list of bizarre, intermittent problems. The owner was fed up. The radio would shut off, the interior lights would pulse, and sometimes the key fob wouldn’t work at all. He’d been to two other shops that couldn’t find the issue. After hooking up my scan tool, I saw a storm of communication errors—U-codes pointing everywhere. This is a classic sign. Instead of a dozen failing parts, it’s the one central module failing to communicate. We swapped in a VIN-programmed BCM, and instantly, all the gremlins vanished. It’s a perfect example of how one part can solve a dozen symptoms.
Is Your Buick Lucerne Showing These BCM Failure Symptoms?
A failing BCM can cause a wide range of issues. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The anti-theft system engaging randomly, causing a no-start condition.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Inconsistent A/C and heater blower fan operation.
- ✔ Multiple warning lights on the dashboard with no other apparent cause.
- ✔ Diagnostic trouble codes related to communication, such as U0140 (Lost Communication With Body Control Module).
A DIY Guide to Replacing Your Lucerne BCM
Replacing the BCM in your Lucerne is a manageable job for a DIYer with basic tools. It’s typically located behind the right side of the dashboard. While specific steps can vary slightly, here is a general guide:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes before starting any electrical work.
- Access the Module: You will likely need to remove the glove box or a lower dash panel on the passenger side to gain access to the BCM. It’s a black plastic box with several large electrical connectors.
- Disconnect and Remove: Carefully unplug all electrical connectors from the old BCM. 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. Ensure they click into place.
- Reconnect and Test: Reinstall any panels you removed, then reconnect the negative battery terminal. Start the vehicle and test all functions—windows, locks, lights, radio, etc.—to confirm the repair.
Important Post-Installation Note: In some cases, additional vehicle-specific relearn procedures may be needed. For example, if your airbag light is on, a professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure. A ‘Brake Pedal Position Relearn’ may also be necessary. Always consult a factory service manual for detailed instructions specific to your vehicle.
Confirmed Vehicle Compatibility List
This Body Control Module is a direct replacement for the 2006-2011 Buick Lucerne. It is also compatible with a wide range of other GM vehicles and supersedes many part numbers. If your original module has any of the following part numbers, this unit will work for your vehicle:
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.
This part also fits models such as the Acadia, Enclave, Traverse, Equinox, Impala, Tahoe, Yukon, Escalade, Express/Savana vans, and more. Please verify your part number to ensure compatibility.
What is a Body Control Module (BCM)?
What is a Body Control Module (BCM)?
The BCM is a computer in your vehicle that controls and monitors most of the non-engine-related electronic functions. This includes power windows, locks, interior and exterior lighting, the security system, wipers, and more. It acts as the central hub for these systems.
Why do I need to provide my VIN?
Your vehicle’s VIN allows us to program the BCM with the exact software and settings for your car’s specific options and features. This makes the installation process plug-and-play and ensures all functions work correctly without a trip to the dealer for expensive programming.
Is this a difficult part to install myself?
For someone with basic mechanical skills and tools, this is a very manageable repair. The main challenge is accessing the module’s location, which is usually behind the dashboard. Because our module is pre-programmed, you avoid the most difficult part of the job—the software configuration.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module, which can be helpful for double-checking part numbers or for any other diagnostic purposes.
What happens if my airbag light comes on after installation?
This can happen occasionally. It means the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure, which must be done with a professional-grade bidirectional scan tool.