End the Electrical Headaches in Your GM Van or Truck
If you’re dealing with bizarre electrical problems in your work van or truck—like flickering interior lights that have a mind of their own, power windows that won’t budge, or a security light that stays on and prevents starting—you’re not alone. These frustrating issues often point to a single culprit: a failing Body Control Module (BCM). As the central command for your vehicle’s body electronics, a faulty BCM can make your reliable workhorse feel unpredictable. This module is the definitive, hassle-free solution to restore full functionality and peace of mind.
Is Your Vehicle Showing These Symptoms?
- ✔ Erratic or non-working power windows, door locks, and mirrors.
- ✔ Interior dome lights or dashboard lights flickering or staying on, draining your battery.
- ✔ The security or anti-theft system light is illuminated, causing a no-start condition.
- ✔ Horn honking unexpectedly or not working at all.
- ✔ Inaccurate gauge readings on the instrument cluster.
- ✔ Diagnostic Trouble Codes (DTCs) related to communication loss, such as U0140, U0155, or U0164.
A Technician’s Notebook: The Contractor’s Van
I remember a 2006 Savana 3500 that came into my bay from a local plumbing contractor. The complaint was ‘it sometimes won’t start, and the battery keeps dying.’ They had already replaced the battery twice and the alternator once. When I hooked up my scanner, I saw a dozen intermittent communication codes. The tell-tale sign was the dome light flickering faintly even when the van was off. The BCM was failing internally, creating a parasitic draw and disrupting the security handshake. We installed a VIN-programmed BCM like this one, and the van was back on the job the next day, problem-free. It’s a classic failure I’ve seen fix hundreds of these GM vehicles.
Your Straightforward BCM Installation Guide
Replacing the 2003-2007 Savana 3500 BCM is a manageable job for a DIYer or professional. Because we program it to your VIN before shipping, you can avoid a costly trip to the dealership for software flashing. Just provide your VIN at checkout, and we handle the rest.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the BCM: On Savana and Express vans, the BCM is typically located in the center of the dashboard, often behind the radio or climate control panel. For Silverado and Sierra pickups, it’s usually under the steering column.
- Remove Trim Panels: Carefully remove any dash panels or covers necessary to access the module. Use a trim removal tool to avoid scratching the plastic.
- Unplug and Unbolt: Disconnect the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Then, remove the bolts or screws holding the module in place.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and secure it. Reconnect all electrical connectors firmly until they click.
- Post-Installation Checks: Reconnect the battery. Turn the key to the ‘On’ position and test all body functions: lights, locks, windows, radio, and wipers. Start the vehicle to ensure it runs correctly.
- Important Relearn Procedures: In some cases, additional steps are needed. If your airbag light is on, a professional scan tool is required for the ‘Setup SDM Primary Key in BCM’ procedure. A Brake Pedal Position relearn may also be necessary for proper brake light and traction control operation.
Guaranteed Fitment for Your GM Vehicle
This Body Control Module is a direct replacement for part number 15747545 and other interchangeable numbers. It is guaranteed to fit the following vehicles. Please verify your model and options below.
Compatible Part Numbers: 15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, 10367689
GMC/Chevrolet Vans (2003-2007):
- SAVANA/EXPRESS 1500, 2500, 3500 (2003): Body Control (BCM); (center dash)
- SAVANA/EXPRESS 1500, 2500, 3500 (2004-2007): Body Control (BCM); (center dash), w/o commercial tradesman package
GMC/Chevrolet Pickups (2003-2007):
- SIERRA/SILVERADO 1500, 2500, 3500 (2003-2006): Body Control (BCM); (under steering column), excluding Crew Cab models.
- SIERRA/SILVERADO 1500, 2500, 3500 (2007 Classic): Body Control (BCM); classic style (creased door skin), (under steering column), excluding Crew Cab models. Check specific transmission options as listed.
Chevrolet SSR (2003-2006):
- SSR (2003-2006): Body Control (BCM)
Disclaimer: Specific procedures and requirements can vary by exact year and model. Always consult a factory service manual or a qualified technician for guidance.
Frequently Asked Questions
Why do you need my VIN?
We use your Vehicle Identification Number (VIN) to program the BCM with the latest GM-approved software specific to your vehicle’s options. This ensures it works correctly right out of the box, saving you a trip to the dealer.
Is this a plug-and-play part?
Yes, for most functions. Because it is pre-programmed, the core operations will work upon installation. However, as with any BCM replacement, some vehicles may require a simple relearn procedure for the airbag or brake systems, which might require a professional scan tool.
Do I need to send my old BCM back?
No. We do not require a core return for this part. You can keep your original module.
What does the Body Control Module (BCM) actually do?
The BCM is like a central computer for your vehicle’s non-engine related electronics. It controls functions like power windows, door locks, interior and exterior lighting, the alarm system, and communicates with other modules in the vehicle.
Will this fix my ‘Service Airbag’ light?
If the light is caused by a faulty BCM, this part will resolve the root cause. However, after installation, the airbag system must be synced to the new BCM using a professional scan tool to turn the light off. This is a standard security procedure.