Tired of Strange Electrical Problems in Your GM Truck?
If your 2003-2006 Chevrolet Avalanche 1500 is acting possessed—with flickering lights, a dead climate control system, or power windows that have a mind of their own—you’re likely dealing with a failed Body Control Module (BCM). The BCM is the electronic brain for your truck’s comfort and security features. When it starts to fail, it can cause a cascade of frustrating and unpredictable issues. This isn’t just an annoyance; a faulty BCM can compromise your vehicle’s security system and even trigger persistent warning lights on the dash.
This replacement BCM, part number 15064149, is the definitive solution. We pre-program it to your truck’s exact VIN before shipping, making installation a true plug-and-play process. You can restore full functionality without an expensive trip to the dealership for programming. Get your truck’s essential systems working reliably again with a dependable, pre-programmed Avalanche 1500 BCM.
A Technician’s Notebook: The Case of the Spooky Silverado
A customer brought in his ’05 Silverado, a sister truck to the Avalanche, with a laundry list of bizarre complaints. The radio would turn on and off, the driver’s side power lock wouldn’t work, and the A/C was completely dead. He’d already replaced the battery and checked all the fuses. After connecting my scanner, I saw a handful of communication codes, including the notorious B1001. In my 20+ years of experience, a mix of unrelated electrical failures almost always points to the BCM. The internal logic board had failed. We swapped in a VIN-programmed module just like this one, and in less than 10 minutes, every single issue was resolved. The customer was thrilled to avoid a massive diagnostic bill and have his truck back to normal.
Is Your Truck Showing These Telltale BCM Failure Signs?
- ✔ The HVAC controls are unresponsive or the blower motor works intermittently.
- ✔ Power windows, door locks, or interior dome lights fail to operate correctly.
- ✔ The anti-theft or security system malfunctions, sometimes causing a no-start condition.
- ✔ An airbag warning light is illuminated on the dash, often with a DTC like B1001 (Option Configuration Error).
- ✔ Wipers operate erratically or won’t turn off.
- ✔ A host of seemingly unrelated diagnostic trouble codes (DTCs) are present.
A Straightforward 5-Minute Installation Guide
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s systems.
- ✔ Locate the BCM: On most GM trucks like the Avalanche, Silverado, and Tahoe, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black plastic 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. Unbolt or unclip the old module from its bracket and remove it.
- ✔ Install the New BCM: Secure your new, pre-programmed BCM into the mounting bracket and firmly reconnect all the electrical connectors. You should hear a click as they lock into place.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Start the vehicle and test all functions: lights, windows, locks, wipers, and HVAC to confirm the repair.
Important Post-Installation Notes
Important Post-Installation Notes
While our VIN programming handles the vast majority of setup, some vehicles may require additional steps:
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part 15064149 and other interchangeable numbers, ensuring compatibility with a wide range of vehicles. This Avalanche 1500 BCM is engineered to meet or exceed OEM specifications for the following models:
CHEVROLET AVALANCHE 2500 02-06 Body Control (BCM); (under steering column)
CHEVROLET EXPRESS VANS 04-07 Body Control (BCM); (center dash), w/commercial tradesman package (opt PRP)
CHEVROLET SILVERADO PICKUPS 03-07 (Classic) Body Control (BCM); (under steering column), Crew Cab
CHEVROLET SUBURBAN 1500/2500 03-06 Body Control (BCM); (under steering column)
CHEVROLET TAHOE 03-06 Body Control (BCM); (under steering column)
GMC SAVANA VANS 04-07 Body Control (BCM); (center dash), w/commercial tradesman package (opt PRP)
GMC SIERRA PICKUPS 03-07 (Classic) Body Control (BCM); (under steering column), Crew Cab
GMC SIERRA DENALI 03-07 (Classic) Body Control (BCM); (under steering column)
GMC YUKON & YUKON XL 03-06 Body Control (BCM); (under steering column)
CADILLAC ESCALADE, ESV, EXT 03-06 Body Control (BCM); (under steering column)
HUMMER H2 03-07 Body Control (BCM); (LH dash)
Frequently Asked Questions
- What does a Body Control Module (BCM) do?
- The BCM acts as a central computer for your vehicle’s body electronics. It controls non-engine-related functions like power windows, locks, lights, wipers, the security system, and the climate control (HVAC) system.
- Do I need to program this module at a dealership?
- No. We pre-program the module to your vehicle’s VIN before it ships. This means it’s ready for installation right out of the box, saving you time and the high cost of dealership programming.
- Is this BCM difficult for a DIYer to install?
- Not at all. For most owners with basic hand tools, this is a very straightforward repair that typically takes less than 15 minutes. The module is usually located under the dashboard and is easy to access.
- What if my airbag light is on after I install the new BCM?
- This can happen occasionally. It means the new BCM needs to be electronically introduced to the airbag system’s computer (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ must be performed with a professional scan tool to clear the light.
- Why is there no core charge for this part?
- We make the process as simple as possible. You are not required to send your old, faulty module back to us. You can simply dispose of it, eliminating the hassle and expense of return shipping.
- Will this fix a “Service 4WD” message?
- While a failing BCM can cause communication errors on the data bus, a “Service 4WD” message is more commonly related to the Transfer Case Control Module (TCCM), a faulty switch, or an encoder motor. It’s best to diagnose that specific system first.
Don’t let electrical gremlins ruin your driving experience. Order your pre-programmed Avalanche 1500 BCM today and restore your truck’s systems to perfect working order.