Tired of Chasing Electrical Gremlins in Your GM Van or Truck?
If you’re dealing with flickering lights, a security system that acts up, power windows with a mind of their own, or strange warning messages on your dash, you’re not alone. As a technician with over two decades of experience, I’ve seen these exact issues countless times. The culprit is often a failing Body Control Module (BCM)—the central nervous system for your vehicle’s comfort and convenience features. A faulty BCM can turn a reliable workhorse like your Savana van into a source of daily frustration. This isn’t just an annoyance; it can affect your vehicle’s security and safety systems.
This replacement BCM, part number 15747545, is the definitive solution. We take the guesswork and dealer-level expense out of the repair. Simply provide us with your Vehicle Identification Number (VIN) after your purchase, and we will program the module with the latest GM software specifically for your vehicle’s configuration. It arrives at your door ready for installation, saving you a trip to the dealership and hundreds of dollars in programming fees. This is the same process we use in our own repair facility to get our customers back on the road quickly and reliably.
A Technician’s Notebook: The Case of the Draining Battery
A few months back, a local contractor brought in his 2006 Savana 2500. The van was his mobile office, but every few days, the battery would be dead. He’d already replaced the battery and alternator, but the parasitic draw continued. After connecting my diagnostic scanner, I noticed the BCM wasn’t allowing other modules to go to ‘sleep’ after the key was off. The interior lights would also flicker randomly. This is a classic internal failure I’ve seen in hundreds of these BCMs. We installed a VIN-programmed module just like this one, and the problem was solved instantly. The parasitic draw disappeared, and all electronics functioned perfectly. It’s a textbook example of how a failing 2003-2007 Savana 2500 BCM can cause such a hard-to-trace issue.
Is Your GM Truck or Van Showing These Symptoms?
A failing BCM can manifest in numerous ways. If your vehicle is experiencing any of the following, a new module is likely the solution you need:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ A security system that engages randomly or prevents the vehicle from starting (Security light on).
- ✔ Inaccurate gauge readings or warning lights on the instrument cluster (e.g., ABS, Airbag).
- ✔ Communication error codes with other modules (U-codes).
- ✔ Horn not working or sounding unexpectedly.
- ✔ A persistent battery drain that leaves you stranded.
Your Straightforward BCM Installation Guide
Installing your new BCM is a manageable job for a DIYer with basic tools. While the process is simple, it’s crucial to know the correct location for your specific vehicle. Always disconnect the battery before starting any electrical work.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the Module: On Savana and Express vans, the BCM is typically located in the center of the dashboard, often behind the radio or climate control panel. On Silverado and Sierra pickups, it’s usually found under the driver’s side of the dashboard, near the steering column.
- Access the BCM: You may need to remove a few trim panels to gain access. For vans, this might involve removing the radio. For trucks, the lower dash panel (knee bolster) will likely need to be unbolted.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. You’ll hear a ‘click’ when they are fully seated.
- Post-Installation Checks: Reassemble your dash panels and reconnect the battery terminal. Start the vehicle and test all functions: lights, windows, locks, horn, and radio. Refer to the post-installation procedures below if any warning lights appear.
Important Post-Installation Note: In some cases, additional steps may be required. If your airbag light is on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Similarly, a ‘Brake Pedal Position Relearn’ might be necessary. This is normal and ensures all systems communicate correctly with the new 2003-2007 Savana 2500 BCM.
Verified Fitment for Your GM Vehicle
This module is a direct replacement for part number 15747545 and is compatible with a wide range of GM vehicles. It also interchanges with part numbers: 15167329, 15194169, 15136224, 15116065, 15198115, 15136876, and 10367689. Please verify your vehicle from the list below:
- Chevrolet Express 1500/2500/3500 Van: 2003-2007
- GMC Savana 1500/2500/3500 Van: 2003-2007
- Chevrolet Silverado 1500/2500/3500 Pickup: 2003-2007 (Classic body style for ’07)
- GMC Sierra 1500/2500/3500 Pickup: 2003-2007 (Classic body style for ’07)
- Chevrolet SSR: 2003-2006
Note: Fitment can vary based on options like Crew Cab or commercial packages. Our VIN programming ensures you receive the correct software for your specific build.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that manages your vehicle’s non-engine-related electronics. This includes power windows, door locks, interior and exterior lighting, the security system, wipers, and the horn.
Do I need to program this module?
No. We handle the programming for you before shipment. Just provide your VIN during checkout, and the module will arrive ready to install, saving you a costly trip to the dealer.
Why do you need my VIN?
Your VIN allows us to load the exact, correct software from GM for your vehicle’s specific options and features. This ensures perfect compatibility and function, just like the original part from the factory.
What if my airbag light is on after installation?
This is a normal security measure. The BCM needs to be synced with the airbag system (SDM). A mechanic with a professional-grade scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old module, so there’s no need to worry about return shipping or waiting for a refund.
Where is the BCM located on my 2003-2007 Savana 2500 BCM?
On the GMC Savana and Chevrolet Express vans, the BCM is located in the center of the dashboard, typically behind the stereo or climate controls. On Silverado and Sierra trucks, it’s under the driver’s side dash near the steering column.