Is Your Buick Lucerne Experiencing Strange Electrical Issues?
If your vehicle’s interior lights are flickering, power windows are unresponsive, or the security system is acting erratically, you’re likely dealing with a failing Body Control Module (BCM). The BCM is the central command center for your car’s body electronics, managing everything from the door locks and interior lighting to the instrument cluster and security system. When it starts to fail, it can cause a cascade of frustrating and unpredictable problems that can make your vehicle feel unreliable.
From the Diagnostic Bay
We had a 2009 Lucerne come into the shop with a list of bizarre symptoms. The radio would cut out intermittently, the dome light would stay on, and the driver’s side power window had a mind of its own. The owner had already replaced the battery and checked all the fuses. After connecting our diagnostic scanner, we found multiple communication error codes pointing towards the BCM. A visual inspection of the original module, located behind the right side of the dash, revealed faint signs of water intrusion on the connector. Replacing the faulty unit with a properly programmed BCM resolved every single issue, restoring the car to perfect working order.
A Reliable, Programmed Solution for Your Vehicle
Don’t let a faulty BCM disrupt your driving experience. This replacement Lucerne Body Control Module is the definitive solution to restore your vehicle’s electronic systems to factory-spec performance. We eliminate the biggest hassle of BCM replacement: the programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest, most stable GM software specific to your car’s configuration. This means the part arrives at your door ready for installation, saving you the time, expense, and headache of a trip to the dealership for programming.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
- ✔ Malfunctioning instrument cluster gauges or warning lights (like the airbag light).
- ✔ Vehicle security system engaging randomly or preventing the car from starting.
- ✔ Remote keyless entry (fob) not working correctly.
- ✔ Communication errors with other modules when scanned with a diagnostic tool.
- ✔ Intermittent issues with the radio or climate control systems.
Installation and Post-Install Considerations
Replacing the Lucerne Body Control Module is a straightforward process for a knowledgeable DIYer or any professional technician. After the physical installation, some vehicles may require additional electronic handshakes between modules. While our programming handles the primary setup, you may encounter the following:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a procedure called ‘Setup SDM Primary Key in BCM’ is needed. This requires a professional-grade scan tool to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure the brake lights and traction control system function as intended.
Please note: Specific procedures can vary. Always consult a factory service manual or a qualified technician for guidance.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM vehicles and is compatible with numerous part numbers. It is guaranteed to fit the models listed in our fitment guide. This unit 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.
Frequently Asked Questions
What does a Body Control Module do?
The BCM acts as the central computer for your vehicle’s body electronics. It reads inputs from switches (like your window switch or headlight switch) and sensors, and then sends commands to operate various accessories like lights, locks, windows, wipers, and the security system.
How do I know for sure that my BCM is the problem?
While the symptoms listed are strong indicators, a definitive diagnosis often requires a professional scan tool that can communicate with the BCM. Look for communication error codes (U-codes) or specific codes related to the functions that are failing. A visual inspection for water damage or corrosion on the module and its connectors can also confirm a failure.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory build data for your car. We use this information to load the correct software and settings for your specific options package, ensuring the new BCM works seamlessly with your vehicle’s other electronic modules right out of the box.
Is this a difficult part to install myself?
For someone with moderate mechanical experience, the physical replacement is generally not difficult. The BCM is typically located under the dashboard. The main challenge is accessing it. The key benefit of our product is that the complex programming is already done, making the installation process much simpler.
What if my airbag light comes on after installation?
This is a common security feature in GM vehicles. It means the new BCM needs to be electronically introduced to the airbag module (SDM). A repair shop with a capable scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module without any additional fees.