Restore Your Cadillac’s Electrical System with a Plug-and-Play BCM

Is your 2008-2013 Cadillac CTS experiencing bizarre electrical issues? Flickering lights, unresponsive power windows, or a security system that has a mind of its own? These are classic signs of a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can turn your driving experience into a frustrating guessing game. In my 20+ years as a technician, I’ve seen how a single failing module can create a cascade of problems that seem unrelated, leading owners on an expensive diagnostic chase. This isn’t just an inconvenience; it can affect vehicle security and safety.

We offer a straightforward and reliable solution. This replacement BCM, compatible with part number 10382479, is the definitive fix for these issues. The biggest hurdle in replacing a BCM has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. Through our expert Cloning Service, we program this module with the latest GM software updates specifically for your car using the VIN you provide. This ensures that when the part arrives, it’s ready for installation right out of the box, restoring all functions just as the factory intended.

Common Signs of a Failing BCM

If you’re noticing any of these symptoms, a faulty BCM is the likely culprit. Don’t let these problems persist—a failing module can lead to no-start conditions or security system lockouts.

• ✔ 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 system alarm sounding randomly or the car refusing to start.
• ✔ ‘Service Theft System’, ‘Service Airbag’, or other warning messages on the dash.
• ✔ Diagnostic Trouble Codes (DTCs) related to communication, such as U0140, U0155, or other U-codes.
• ✔ Horn, windshield wipers, or other accessories activating on their own.

A Straightforward Guide to Installation

Installing your new BCM is a manageable job for a DIY enthusiast. While the exact location can vary slightly, on the 2008-2013 Cadillac CTS, the BCM is typically located behind the lower dash panel on the driver’s side.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
2. Access the Module: Remove the necessary trim panels under the steering column or in the driver-side kick panel area to expose the BCM.
3. Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that must be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
4. Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all electrical connectors. You should hear a ‘click’ as they lock into place.
5. Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, wipers, etc.
6. Perform Relearns (If Necessary): As noted below, some vehicles may require a ‘Setup SDM Primary Key’ or ‘Brake Pedal Position Relearn’ procedure if specific warning lights appear. This is not always required but is a possibility.

Post-Installation Procedures

Because our service clones your vehicle’s data, most functions will work immediately. However, in some GM vehicles, certain security or safety systems may require a quick sync after the new BCM is installed.

• Airbag System Sync: If the airbag light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
• Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be needed to ensure correct brake light operation and traction control function.

Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.

Verified Vehicle Compatibility

This BCM is a direct replacement for a wide range of GM vehicles. Please match your original part number to the list below or confirm fitment with your vehicle’s year, make, and model. This module 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.