Is Your Vehicle Experiencing Strange Electrical Problems?
If your Cadillac, Chevrolet, or GMC is suffering from flickering lights, malfunctioning power windows and locks, or a security system that acts on its own, a failing Body Control Module (BCM) is the likely culprit. The BCM is the central command center for your vehicle’s body electronics, coordinating everything from your interior lights and turn signals to the keyless entry system. When it fails, it can create a cascade of frustrating and unpredictable issues that can be difficult to diagnose.
From the Diagnostic Bay
We once had a 2010 Cadillac STS come into the shop with a textbook case of BCM failure. The owner had already replaced the headlight switch and two window regulators trying to solve intermittent issues. The interior lights would stay on, the driver’s window wouldn’t go down, and the remote fob worked only half the time. After a quick scan, we confirmed communication errors with the BCM. By replacing it with a VIN-programmed unit like this one, we resolved all the seemingly unrelated problems in a single repair, saving the customer from further unnecessary parts and labor costs.
The Direct-Fit Solution: A Programmed 2010 STS Body Control Module
Don’t let a faulty BCM keep you guessing. This Body Control Module, part number 20921435, is the definitive solution to restore your vehicle’s electronic functions. The most significant advantage of our service is that we program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the BCM communicates perfectly with your car’s other computers right out of the box, eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play repair.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional interior and exterior lights (headlights, taillights, dome lights).
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ Malfunctioning keyless entry remote or push-button start.
- ✔ Security system or alarm randomly activating or preventing the car from starting.
- ✔ Dashboard warning lights (like the airbag or security light) illuminating for no reason.
- ✔ Wipers or horn activating unexpectedly.
- ✔ Inaccurate readings on the instrument cluster.
Installation and Post-Install Considerations
Installation is straightforward for those with moderate mechanical skill. The BCM is typically located under the dashboard on the driver’s or passenger’s side. After disconnecting the battery, you simply unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. While our VIN programming handles the primary setup, some vehicles may require simple relearn procedures for full functionality.
- Airbag System Sync: In some cases, the airbag warning light may illuminate after installation. This indicates a sync is needed between the new BCM and the airbag system’s computer (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure.
- Brake Pedal Position Relearn: A recalibration of the brake pedal position sensor might be necessary to ensure correct brake light operation and to prevent issues with the traction control system.
Always consult a factory service manual for your specific vehicle for detailed instructions and torque specifications.
Guaranteed Fitment and Compatibility
This module is a direct replacement for a wide range of General Motors vehicles and interchanges with numerous part numbers, including 15828601, 20815898, 22860591, 25892622, and more. By providing your VIN, you guarantee that the 2010 STS Body Control Module you receive is perfectly configured for your vehicle’s specific options and features.
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before shipping it. This makes the installation process plug-and-play, saving you time and the high cost of dealership programming.
What happens if I forget to provide my VIN?
Providing your VIN is a required step for this purchase. We cannot program or ship the module without it. After you place your order, we will contact you to obtain the VIN to ensure the BCM is correctly configured for your exact vehicle.
Where is the BCM located on my vehicle?
The location varies by model. Common locations include behind the driver’s side lower dash panel (near the steering column), behind the glove box, or in the center console area. A quick search for your specific year, make, and model will typically provide diagrams or videos showing the exact location.
Will this fix my specific electrical problem?
If your vehicle is exhibiting multiple symptoms from the list above, a faulty BCM is the most probable cause. This part is designed to correct those issues. However, we always recommend proper vehicle diagnostics to confirm the BCM is the root cause before ordering.
Is there a core charge for my old module?
No, there is no core charge. You can keep your original module without needing to send it back.