Tired of Chasing Electrical Gremlins in Your Truck?
If your 2007-2011 Chevrolet Avalanche 1500 is acting possessed—with flickering lights, a dead climate control system, or power windows with a mind of their own—you’re likely dealing with a failing Body Control Module (BCM). As the central hub for your truck’s body electronics, a faulty BCM can cause a cascade of frustrating and seemingly unrelated problems. This isn’t just an annoyance; it can affect your vehicle’s security and safety. Stop the guesswork and replace it with a reliable, pre-programmed solution.
This OEM-quality BCM, a direct replacement for part number 15943678 and others, arrives at your door fully programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming. It’s designed to be a true plug-and-play fix, getting you back on the road with full functionality restored quickly and affordably. It’s the definitive solution for the DIY mechanic or professional technician looking for a dependable repair that works right out of the box.
A Technician’s Notebook: The Case of the Intermittent Failure
I had a 2009 Sierra come into the shop last month with a list of complaints that made no sense together. The radio would cut out, the driver’s side window wouldn’t work, and the airbag light was on. The owner had already replaced the battery and checked the main grounds. My initial scan pulled a B1001 code and a dozen ‘loss of communication’ codes. After spending an hour tracing wires and finding nothing, we swapped in a programmed BCM. Every single issue vanished. These modules are notorious for causing these ghost-in-the-machine problems, and a direct replacement is often the fastest and most reliable fix.
Is Your Avalanche Showing These Glitches?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. This is especially true if you see diagnostic trouble codes (DTCs) like B1001.
- ✔ Power windows, door locks, or mirrors not working or operating erratically.
- ✔ HVAC and climate controls are unresponsive or the blower motor works intermittently.
- ✔ The anti-theft or security system malfunctions, preventing the truck from starting.
- ✔ Interior dome lights or exterior lights (headlights, taillights) fail to turn on or off.
- ✔ The airbag warning light is illuminated on the dashboard.
- ✔ Unexplained battery drain when the vehicle is off.
- ✔ Wipers behaving erratically or not working at all.
Your Quick-Start Installation Guide
Installing your new Avalanche 1500 Body Control Module is a straightforward process that most DIYers can complete in under 15 minutes with basic tools. It’s located under the driver’s side dashboard, near the steering column.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the BCM: On your Avalanche, it’s typically mounted to a bracket just above the pedals or to the left of the steering column. You may need to remove a lower dash panel for access.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module from its mounting bracket.
- Install the New Module: Seat the new, pre-programmed BCM onto the bracket and securely plug in all the electrical connectors. You’ll hear a click as they lock into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, windows, locks, HVAC, and wipers.
- Post-Installation Checks: In some cases, an airbag light may remain on. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. A Brake Pedal Position relearn may also be needed for certain models.
Verified Compatibility for Your GM Truck or SUV
This Body Control Module is a direct replacement for part number 15943678 and is interchangeable with a wide range of other part numbers, including 25844480, 25835966, 15926094, and more. It fits a broad selection of 2007-2013 General Motors vehicles. Please verify your part number or use our vehicle selector to ensure a perfect match. Key compatible models include:
- ✔ Chevrolet Avalanche 1500 (2007-2011)
- ✔ Chevrolet Silverado 1500/2500/3500
- ✔ Chevrolet Suburban 1500/2500
- ✔ Chevrolet Tahoe
- ✔ GMC Sierra 1500/2500/3500 & Denali
- ✔ GMC Yukon & Yukon XL
- ✔ Cadillac Escalade, ESV & EXT
Frequently Asked Questions
Frequently Asked Questions
Do I need to take this BCM to a dealer for programming?
No. This module comes pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you the time and expense of a dealership visit.
Is there a core charge for my old part?
There is no core charge. You can keep or dispose of your old module without any extra fees or hassle.
My airbag light is on after installing. What do I do?
This is a common security feature. You will need a professional-grade scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system and will turn off the light. Most independent repair shops can perform this service.
How difficult is the installation?
For most people with basic hand tools, the physical installation is very easy and takes less than 15 minutes. It involves removing a dash panel and swapping the module. No complex wiring is required.
What if my original part number is different?
This module is a direct replacement for many part numbers, including 25844480, 25835966, and the specified 15943678. As long as your vehicle is listed in the compatibility chart, this module will function correctly.