Restore Full Functionality to Your GM Vehicle
Are you dealing with baffling electrical problems in your Cadillac Escalade, Chevy Silverado, or GMC Sierra? A faulty Body Control Module (BCM) is often the culprit behind these frustrating issues. As the central command center for your vehicle’s body electronics, a failing BCM can disrupt everything from your power windows and door locks to your HVAC system and security features. This replacement BCM, equivalent to part number 15943678, is the definitive solution. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a seamless, plug-and-play installation.
A Technician’s Notebook: The Case of the Ghostly Glitches
I remember a 2009 Silverado 2500 that came into my bay with a list of complaints that seemed unrelated. The driver’s side window wouldn’t go down, the radio would randomly shut off, and the ‘Service Airbag’ light was on. The owner had already replaced the battery and checked fuses with no luck. After connecting my scanner, I saw a slew of communication codes pointing to the BCM. Instead of a complex rewiring job, the fix was a simple, VIN-programmed BCM. In under 10 minutes, all the ghostly glitches were gone. This is a classic BCM failure scenario I’ve seen hundreds of times on these GM trucks.
Is Your GM Truck or SUV Showing These Symptoms?
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ The HVAC and climate control system is unresponsive, or the blower motor is stuck on or off.
- ✔ An active ‘Service Airbag’ light on the dash, often with a DTC B1001 stored in the system.
- ✔ The anti-theft or security system malfunctioning, causing no-start or stalling conditions.
- ✔ Unpredictable behavior from interior or exterior lights, including headlights and dome lights.
- ✔ Inconsistent windshield wiper operation.
Your 5-Minute Path to a Perfect Fix
Replacing the BCM is a straightforward job that most DIYers can complete with basic tools. This module is conveniently located and designed for a quick swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On most compatible models, you’ll find the BCM under the driver’s side dashboard, to the left of the steering column. It’s often a black box with several large multi-pin connectors.
- Swap the Module: Carefully unplug the electrical connectors from the old BCM. They have release tabs that need to be pressed. Once disconnected, unbolt or unclip the old module and remove it.
- Install the New BCM: Mount your new, VIN-programmed BCM in the same location. Firmly reconnect all electrical connectors until they click securely into place.
- Reconnect & Test: Reconnect the negative battery terminal. Start the vehicle and test all functions controlled by the BCM—windows, locks, lights, wipers, and HVAC—to confirm the repair was successful.
Post-Installation Note: In some cases, particularly if you had an airbag light, a ‘Setup SDM Primary Key in BCM’ procedure may be needed using a professional scan tool to clear the code. Additionally, a Brake Pedal Position Relearn might be required on certain models. There is no core charge for this part, so you can keep your old module without any hassle.
Verified Fitment for Your Truck or SUV
This Body Control Module is a direct-fit replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers including 15943678, 25835966, 15878753, 20939137, 22860591, and more. Please verify your part number or use our vehicle selector to ensure compatibility. It fits models such as:
CADILLAC ESCALADE ESV 2007-2011
CADILLAC ESCALADE EXT 2007-2011
CHEVROLET AVALANCHE 1500 2007-2011
CHEVROLET SILVERADO 1500/2500/3500 2007-2011
CHEVROLET SUBURBAN 1500/2500 2007-2011
CHEVROLET TAHOE 2007-2011
GMC SIERRA 1500/2500/3500 2007-2011
GMC SIERRA DENALI 2007-2011
GMC YUKON & YUKON XL 2007-2011
Frequently Asked Questions
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM acts as the brain for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the HVAC blower, ensuring all these convenience and safety features work correctly.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and settings onto the BCM before it ships. This makes the module plug-and-play, allowing it to communicate correctly with other modules in your vehicle without requiring a trip to the dealership for expensive programming.
Will this fix my airbag light that shows code B1001?
Yes, a faulty BCM is a very common cause for a B1001 code. Replacing it with this module should resolve the root cause. However, after installation, you may need a capable scan tool to perform the ‘Setup SDM Primary Key in BCM’ function to clear the light.
Is this part difficult to install myself?
Not at all. For most DIYers, this is a simple, 5-10 minute job. The BCM is typically located under the driver’s side dash and is held in by a few clips or bolts. No special tools are required for the physical swap.
My original part number is slightly different. Will this still work?
This module is a direct replacement for many part numbers, including 15943678, 25835966, and 22860591. Check the full interchange list in our description or contact us with your VIN, and our experts will guarantee you get the right part for your truck.