Restore Your Truck’s Electrical Systems with a Pre-Programmed BCM
If you’re dealing with bizarre electrical issues in your 2003-2006 Chevrolet Avalanche 1500, the Body Control Module (BCM) is the most likely culprit. As the central command for your truck’s body electronics, a failing BCM can cause a cascade of frustrating problems, from flickering lights to a non-responsive climate control system. This replacement BCM, equivalent to GM part number 15137395, arrives at your door fully programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership visits, allowing you to perform a simple, plug-and-play repair and get your truck back to 100% functionality.
A Technician’s Notebook: The Case of the Haunted Silverado
I once had a 2005 Silverado in the shop that was driving the owner crazy. The radio would switch off, the dome light would flicker randomly, and the power locks worked only when they felt like it. He had already replaced the battery and checked all the fuses. After connecting my scanner, I saw a handful of communication codes pointing to the BCM. These modules are notorious for internal solder joint failures and corrupted data over time. We installed a VIN-programmed BCM just like this one, and in less than 10 minutes, every single electrical gremlin was gone. It’s a common failure, but thankfully, it’s a straightforward fix with the right part.
Is Your Truck Showing These Symptoms?
A faulty 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 communication codes like B1001 or U-series codes stored in the system.
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ Interior or exterior lights (headlights, taillights, dome lights) staying on or not turning on.
- ✔ HVAC and climate control functions failing, including a blower motor that won’t run.
- ✔ The security system acting up, causing a no-start condition or the alarm to go off randomly.
- ✔ An airbag (SRS) light illuminated on the dash.
- ✔ Inconsistent or non-functional windshield wipers.
A Straightforward Guide to BCM Installation
Replacing the BCM in your truck is a simple job that most DIYers can complete in their driveway in under 15 minutes. Our pre-programmed module for the 2003-2006 Avalanche 1500 BCM makes it even easier.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all modules have powered down.
- Locate the BCM: On most GM trucks and SUVs of this era, 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.
- Remove the Old Module: Carefully unplug the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, the module can be unclipped or unbolted from its mounting bracket.
- Install the New BCM: Snap the new, VIN-programmed BCM into the mounting bracket and securely reconnect all electrical connectors. You’ll hear a click when they are fully seated.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘ON’ position and test all functions: lights, locks, windows, wipers, and HVAC to confirm the repair was successful.
Verified Vehicle Compatibility
This module is a direct replacement for part number 15137395 and other interchangeable numbers. It is guaranteed to fit the following vehicles (please verify your specific options):
- Chevrolet Avalanche 1500/2500: 2003-2006
- Chevrolet Silverado 1500/2500/3500: 2003-2007 (Classic Body Style)
- Chevrolet Suburban 1500/2500: 2003-2006
- Chevrolet Tahoe: 2003-2006
- GMC Sierra 1500/2500/3500 & Denali: 2003-2007 (Classic Body Style)
- GMC Yukon & Yukon XL 1500/2500: 2003-2006
- Cadillac Escalade, ESV, EXT: 2003-2006
- Hummer H2: 2003-2007
- Chevrolet Express & GMC Savana Vans: 2004-2007 (with commercial tradesman package)
Frequently Asked Questions
Why is VIN programming so important?
Your truck’s VIN contains information about its specific options, like the type of transmission, security system, and lighting packages. Programming the BCM to your VIN ensures all these features work correctly right out of the box, just as the factory intended, without requiring any additional setup from a dealer.
Is there a core charge for my old part?
No. We do not require you to send back your old BCM. There is no core charge, which saves you the time and hassle of return shipping.
What if my airbag light is on after installation?
In some cases, the new BCM needs to be synced with the airbag’s Sensing and Diagnostic Module (SDM). This is a simple procedure called ‘Setup SDM Primary Key in BCM’ that can be performed by a professional mechanic with a capable bi-directional scan tool.
Will this fix my specific problem?
This module is the solution for a wide range of body electronic failures. If your symptoms match the list provided and you’ve ruled out simple causes like fuses or bulbs, a faulty BCM is the most probable cause. This part is designed to be a reliable, long-term fix.
What tools do I need for the installation?
For most models, the only tool you’ll need is a basic socket or wrench to disconnect the battery terminal. The BCM itself is typically held in place by plastic clips, requiring no tools for removal.