Is Your GM Truck or Van Acting Possessed?
Are you dealing with a vehicle that seems to have a mind of its own? Flickering interior lights, power windows that won’t cooperate, door locks with a strange new personality, or a security light that stays on, preventing your engine from starting? Before you start tearing apart wiring harnesses, the culprit is often the Body Control Module (BCM)—the central computer for your vehicle’s comfort and security features.
In my 20+ years of diagnostics, I’ve seen these exact issues countless times. A customer’s 2005 Silverado 2500 came into the shop last week with a classic case. The dome lights would randomly turn on while driving, and the driver’s side power window worked only when it felt like it. He had already replaced the window motor and switch with no success. After a quick scan, we confirmed communication faults pointing directly to a failing BCM. A faulty BCM can send you on a wild goose chase, costing you time and money replacing perfectly good parts. This module is the direct, reliable fix.
The Simple, No-Dealer-Required Solution
This isn’t just a replacement part; it’s a complete solution. We take a fully tested BCM and program it specifically to your vehicle’s VIN using the latest GM software updates. This means it arrives at your door ready for installation, with no need for expensive dealership programming or specialized scan tools for the initial setup. You’re getting a module that is perfectly matched to the specific options and configuration of your truck or van.
Common Symptoms of a Failing BCM:
- ✔ Erratic or non-functional interior/exterior lights
- ✔ Power windows or door locks working intermittently or not at all
- ✔ The security or anti-theft light staying illuminated, causing a no-start condition
- ✔ Horn honking unexpectedly or not working
- ✔ False warnings on the instrument cluster (e.g., ‘Door Ajar’)
Easy Installation for Your 2003-2007 GM BCM
Getting your vehicle back to normal is straightforward. The location of the BCM varies slightly between trucks and vans, but the process is simple for a DIYer with basic tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning work.
- Locate the BCM: On Silverado and Sierra pickups, it’s typically found under the driver’s side of the dashboard, near the steering column. For Express and Savana vans, it’s located behind the center dash trim.
- Remove Trim (If Necessary): You may need to remove a lower dash panel or center trim piece to gain access. These are usually held by a few screws or clips.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old module from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in place and securely reconnect all electrical connectors. You’ll hear a ‘click’ when they are fully seated.
- Reconnect Battery: Re-attach the negative battery terminal.
Expert Pro Tip from the Shop Floor
Before plugging in your new BCM, take a moment to inspect the connector terminals on the vehicle’s wiring harness. Over the years, moisture and vibration can cause minor corrosion (often appearing as a green or white powder). Use a small nylon brush and some electrical contact cleaner to gently scrub the terminals. A clean, solid connection is critical for the long-term health and performance of your new module.
Important Final Steps After Installation
After your new module is installed, a couple of quick procedures are required to ensure all systems communicate correctly. This is a normal part of the process.
- Airbag System Reset: The airbag light (SRS light) will be on. You must perform the ‘Setup SDM Primary Key in BCM’ procedure with a compatible high-level diagnostic tool. This re-establishes the security handshake between the BCM and the airbag system.
- Brake Pedal Position Sensor Relearn: Some vehicles may require a Brake Pedal Position (BPP) sensor relearn. This ensures the brake lights and stability control systems function correctly with the new module. This is also performed with a diagnostic tool.
Note: If you are not equipped to perform these final steps, most local repair shops can complete them for you quickly.
This Module is a Direct Fit For Part Numbers:
15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, 10367689
Guaranteed Vehicle Fitment:
This 2003-2007 GM BCM is compatible with a wide range of GM trucks and vans, including Chevrolet Silverado, Express, SSR, and GMC Sierra, Savana models. Please verify your specific model and options from the detailed fitment list to ensure perfect compatibility.