Restore Your Buick’s Electrical Systems with a Reliable, Programmed BCM
Are you chasing electrical gremlins in your 2006-2011 Buick Lucerne? From flickering interior lights and malfunctioning power windows to a security system that randomly prevents your car from starting, a failing Body Control Module (BCM) can be the hidden cause of dozens of frustrating issues. The BCM is the central nervous system for your vehicle’s comfort and convenience features. When it fails, it can make your car feel unpredictable and unreliable. This isn’t just an inconvenience; it can be a serious safety concern if it affects lighting or security.
We offer a straightforward, dependable solution. This BCM, part number 20935349, is meticulously tested and then programmed specifically to your vehicle’s VIN before it ships. This means it arrives at your door ready for installation, loaded with the newest GM software to correct known bugs and improve performance. You get a reliable repair without the exorbitant cost and scheduling headaches of a dealership visit.
From the Diagnostic Bay: The Case of the Haunted Lucerne
I remember a 2008 Buick Lucerne that came into my shop with a laundry list of bizarre symptoms. The owner said the radio would change stations on its own, the dome light would flicker while driving, and occasionally, the key fob wouldn’t work. He’d already replaced the battery and checked the fuses. My initial scan showed a dozen communication error codes (U-codes) pointing to a network issue. After checking the main data bus connectors for corrosion, I focused on the BCM. By monitoring the data stream, I could see erratic voltage outputs from the module that corresponded with the owner’s complaints. This is a classic BCM failure. We installed one of our pre-programmed units, and within an hour, every single ghost in his machine was gone. It’s a common failure point I’ve seen on hundreds of these GM platforms.
Is Your Vehicle Showing These Symptoms?
A failing BCM can manifest in many ways. If you’re experiencing any of the following, a faulty module is a likely culprit:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ The security or anti-theft system light is on, and the car won’t start.
- ✔ Dashboard warning lights appearing randomly (e.g., Service Vehicle Soon).
- ✔ Communication error codes, such as U0140, U0155, or other U-series codes, stored in the system.
- ✔ The horn honking unexpectedly or the key fob functions working intermittently.
A Straightforward Guide to Installation
For the confident DIYer or professional mechanic, replacing the BCM is a manageable job. In the 2006-2011 Lucerne, it’s typically located behind the right side of the dashboard.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes to allow all system capacitors to discharge.
- 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 wiring harnesses from the old BCM. They have locking tabs that need to be pressed. 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 wiring harnesses. Ensure they click into place.
- Reconnect and Test: Reinstall any panels you removed, then reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—windows, locks, lights, radio, etc.—to confirm the repair.
Important Post-Installation Note: While our programming handles the majority of the setup, some vehicles may require additional steps. If your airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, a ‘Brake Pedal Position Relearn’ may be necessary on certain models to ensure proper brake light and traction control operation. And remember, there is absolutely no core charge. You can keep your old module.
Guaranteed Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles and part numbers. Please verify your vehicle is on this list and that your original part number is listed below. Our VIN programming ensures it works correctly with your specific options.
This BCM replaces the following 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
ACADIA 07-12, AVALANCHE 1500 10, CAPRICE 11-13, CAPTIVA SPORT 12, CTS 08-13, DTS 06-11, ENCLAVE 08-12, EQUINOX 07-09, ESCALADE 10, ESCALADE ESV 10, ESCALADE EXT 10, EXPRESS VANS 08-12, G8 08-09, HUMMER H2 08-09, IMPALA 06-13, LUCERNE 06-11, MONTE CARLO 06-07, OUTLOOK 07-10, SAVANA VANS 08-12, SRX 07-09, STS 10, SUBURBAN 1500 10, TAHOE 10, TORRENT 07-09, TRAVERSE 09-12, VUE 08-10, YUKON 10, YUKON XL 1500 10. (Please check the detailed fitment data to confirm your specific options.)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming myself?
No. We program the module to your car’s VIN before shipping. It arrives ready to be installed, saving you a trip to the dealership. In some rare cases, a minor relearn procedure for the airbag or brake pedal sensor may be needed post-installation.
Is this a new or used part?
This is a high-quality, tested component that is guaranteed to restore your vehicle’s function. We ensure every module passes our rigorous quality control checks before being programmed and shipped.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not have a core charge on this item, so you can keep your original module without any extra fees or hassle.
How do I find the BCM in my 2006-2011 Buick Lucerne?
In the Lucerne, the Body Control Module is typically located on the passenger side of the vehicle, behind or near the glove compartment area.
Will this fix my car’s ‘Service Theft System’ message?
A faulty BCM is a very common cause of security system problems, including the ‘Service Theft System’ warning and no-start conditions. Because our module is programmed to your VIN, it correctly syncs with your vehicle’s anti-theft system, often resolving these issues.