Restore Full Electronic Functionality to Your Vehicle
Are you battling a cascade of bizarre electrical problems in your Cadillac STS or another GM vehicle? Flickering lights, malfunctioning power windows, a security system that acts on its own, or dashboard warning lights that won’t turn off are all classic signs of a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, coordinating everything from your interior lights and door locks to your climate control and driver information center. When it fails, it can make your vehicle frustrating and unreliable to operate.
This is not just any replacement part. This is a complete, pre-programmed solution. We take a genuine OEM BCM, part number 20815898, and flash it with the latest GM software updates specifically for your vehicle. By providing us with your Vehicle Identification Number (VIN) at checkout, you receive a module that is ready for installation, eliminating the need for expensive programming services at a dealership.
From the Diagnostic Bay
We had a 2010 Cadillac CTS come in with the strangest symptoms. The customer complained that the radio would randomly change stations, the driver’s side window wouldn’t go down, and the horn would honk when they used the turn signal. We checked all the wiring and individual components, but couldn’t find a fault. After hooking up the scan tool, we noticed communication errors originating from the BCM. A failing BCM was corrupting the data network, causing these seemingly unrelated systems to go haywire. Installing a VIN-programmed BCM like this one resolved all the issues in under an hour. It’s a perfect example of how one central module can cause a vehicle-wide headache.
Diagnosing a Faulty 2010 STS Body Control Module
A faulty BCM doesn’t always trigger a check engine light, making it difficult to diagnose without experience. The symptoms are often mistaken for individual switch or motor failures. If you’re experiencing several of the following issues, the BCM is the most likely culprit.
Common Symptoms of BCM Failure
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ Malfunctioning climate control system (A/C or heat).
- ✔ Erratic behavior from the radio or infotainment system.
- ✔ False alarms from the security system or problems with the keyless entry remote.
- ✔ Incorrect readings on the instrument cluster gauges or information display.
- ✔ The engine won’t start, or the starter cranks but won’t engage due to security system confusion.
The VIN-Programmed Advantage
Modern vehicles are complex, and the BCM is at the heart of that complexity. It needs to know the specific options and features your car was built with. Simply swapping a BCM from another vehicle won’t work—it will cause even more problems. Our service bridges that gap. We use your VIN to access the original build data for your exact car and program this module to be a perfect electronic match. This ensures all features function as they did from the factory. This module is a direct replacement for a wide range of part numbers, including: 10382479, 15093910, 15276271, 15299986, 15819552, and many others listed in the fitment guide.
Installation and Post-Install Considerations
While the physical installation is often straightforward, typically involving removing a lower dash panel to access the module, some post-installation steps, known as ‘relearn’ procedures, may be necessary. We’ve outlined the most common ones below. These ensure that all related vehicle systems communicate correctly with the new BCM.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM) and must be performed with a professional-grade scan tool.
- Brake Pedal Position Relearn: Some models may require a recalibration of the brake pedal position sensor. This is crucial for the proper function of your brake lights and electronic stability control systems.
Please Note: Specific procedures can vary by vehicle. We always recommend consulting a factory service manual or a qualified technician for detailed instructions for your specific make and model.
Frequently Asked Questions
What exactly does a Body Control Module do?
The Body Control Module (BCM) acts as the central computer for your vehicle’s non-engine related functions. It controls power windows, locks, lights, wipers, climate control, security system, and more, ensuring all these comfort and convenience features work together seamlessly.
Do I need to program this BCM?
No. This BCM comes fully pre-programmed to your vehicle’s specific VIN. You just need to provide us with your VIN during or after your purchase. This saves you a costly trip to the dealership for programming.
How do I provide my VIN number?
You can add your VIN to the notes section during checkout or send it to us in a message after you’ve placed your order. We cannot ship the module until we have your VIN to complete the programming.
What if my airbag light comes on after installation?
This is a known possibility. It means the new BCM needs to be electronically ‘introduced’ to the airbag system computer (SDM). A technician with a professional scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules and turn off the light.
Is this a simple plug-and-play installation?
For many vehicles, it is. The module is programmed and ready to go. However, as noted, some vehicles may require additional ‘relearn’ procedures for systems like the airbag or brake pedal sensor. The physical swap is typically straightforward for a DIYer with basic tools.
How can I be sure this BCM will fit my vehicle?
This module replaces many different part numbers and fits a wide variety of GM vehicles. The most important step is providing your VIN. We use your VIN to ensure the programming is a 100% match for your vehicle’s factory options, guaranteeing compatibility.