Restore Your Buick’s Brain and End Electrical Frustration
If you’re dealing with bizarre electrical issues in your 2006-2011 Buick Lucerne—like power windows with a mind of their own, flickering dashboard lights, or a security system that randomly prevents the car from starting—you’re not alone. These are classic signs of a failing Body Control Module (BCM). As the central hub for your car’s body electronics, a faulty BCM can turn your reliable Lucerne into a source of daily headaches. This isn’t just an inconvenience; it can affect vehicle security and safety systems.
This replacement Body Control Module, part number 20935349, is the definitive solution. We take the biggest hurdle out of the repair process: programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM-certified software specific to your car. This means you receive a part that is truly ready for installation, saving you a costly trip to the dealership and hours of diagnostic guesswork.
A Technician’s Notebook: The Case of the Haunted Lucerne
A customer brought in their ’08 Lucerne with a list of complaints that sounded like the car was possessed. The radio would shut off, the interior lights would pulse, and occasionally, the car wouldn’t start, showing a ‘Service Theft System’ message. They’d already replaced the battery and checked the alternator. After hooking up my scan tool, I saw multiple communication loss codes with various modules. In my 20+ years of experience, this pattern almost always points back to a single source: a failing BCM. The internal processors and relays wear out, causing intermittent data corruption on the CAN bus network. We installed a VIN-programmed BCM, and every single issue was resolved instantly. It’s a common failure, but with the right part, it’s a straightforward fix.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, and interior/exterior lights.
- ✔ The security system or anti-theft light is illuminated, often causing a no-start condition.
- ✔ Dashboard warning lights appearing and disappearing without reason.
- ✔ The radio or climate control system works intermittently or not at all.
- ✔ False warnings on the driver information center (DIC).
- ✔ Rapid battery drain while the vehicle is parked.
Your Straightforward BCM Installation Guide
Replacing the BCM in your Lucerne is a manageable job for a confident DIYer. Our pre-programming service handles the most complex step, leaving you with the physical swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the BCM: In the 2006-2011 Buick Lucerne, the Body Control Module is typically located on the right side of the dash, accessible by removing the glove box or a lower dash panel.
- Disconnect and Remove: Carefully unplug the 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 Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Post-Installation Procedures (CRITICAL): After installation, you must perform a ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-end scan tool to sync the BCM with the airbag system and clear the airbag light. Some vehicles may also require a Brake Pedal Position Sensor recalibration. If you are not equipped to do this, a professional mechanic can complete these final steps for you.
Verified Vehicle Compatibility
This BCM is a direct replacement for a wide range of General Motors vehicles. While this listing is focused on the 2006-2011 Lucerne Body Control Module, it also fits the models listed below. It is a direct replacement for 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, and 95151084.
ACADIA 07-12 Body Control (BCM); (LH dash)
AVALANCHE 1500 10 Body Control (BCM); (under steering column), ID 25892622
CAPRICE 11-13 Body Control (BCM)
CAPTIVA SPORT 12 Body Control (BCM); (center dash), ID 20921435, 20921436, 22860591
CTS 08-13 Body Control (BCM); LH dash
DTS 06-11 Body Control (BCM); (RH center dash)
ENCLAVE 08-12 Body Control (BCM); (LH dash)
EQUINOX 07-09 Body Control (BCM); (center dash)
ESCALADE 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
ESCALADE ESV 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
ESCALADE EXT 10 Body Control (BCM); (under steering column), ID 25892622
EXPRESS 1500 VAN 08-12 Body Control (BCM); (center dash)
EXPRESS 2500 VAN 08-12 Body Control (BCM)
EXPRESS 3500 VAN 08-12 Body Control (BCM)
G8 08-09 Body Control (BCM); (center dash)
HUMMER H2 08-09 Body Control (BCM); (LH firewall)
IMPALA 06-13 Body Control (BCM); (LH dash)
MONTE CARLO 06-07 Body Control (BCM); (LH steering column)
OUTLOOK 07-10 Body Control (BCM); (center dash)
SAVANA 1500 VAN 08-12 Body Control (BCM); (center dash)
SAVANA 2500 VAN 08-12 Body Control (BCM)
SAVANA 3500 VAN 08-12 Body Control (BCM)
SRX 07-09 Body Control (BCM); LH dash
STS 10 Body Control (BCM); center dash
SUBURBAN 1500 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
TAHOE 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
TORRENT 07-09 Body Control (BCM); (center dash)
TRAVERSE 09-12 Body Control (BCM); (LH dash)
VUE 08-10 Body Control (BCM); (center dash)
YUKON 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
YUKON XL 1500 10 Body Control (BCM); (under steering column), ID 20815898, 25892622
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We handle the programming for you before shipment. Just provide your vehicle’s 17-digit VIN when you order, and it will arrive ready for installation and final setup procedures.
What information do you need from me?
We need your complete 17-digit Vehicle Identification Number (VIN). This is essential for us to load the correct GM software and vehicle-specific options onto the module.
Will this fix my car’s specific electrical problem?
This BCM will correct issues directly caused by a faulty Body Control Module, such as the symptoms listed above. If your problem is due to a bad switch, wiring, or another component, this will not resolve it. Proper diagnosis is key.
What happens if the airbag light is on after installation?
This is expected. The new BCM must be electronically introduced to the airbag system (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure using a professional-grade scan tool. Any qualified repair shop can perform this for you.
Is this a difficult part to install myself?
For someone with basic mechanical skills and tools, the physical replacement is straightforward. The most challenging part for a DIYer is the post-installation electronic setup (airbag and brake sensor). If you don’t have the required scan tool, plan on having a local mechanic complete the job.