If you’re dealing with a cascade of bizarre electrical problems in your GM truck, van, or SUV, you’ve likely met the frustrating reality of a failing Body Control Module (BCM). As a technician with over 20 years of experience, I’ve seen it all: power windows with a mind of their own, intermittent door locks, a security light that won’t turn off, or interior lights that flicker for no reason. These aren’t separate issues; they’re symptoms of a failing central command center. This GM Body Control Module is the definitive, reliable solution to restore order to your vehicle’s electronics.
The biggest hurdle in replacing a BCM has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. Simply provide us with your vehicle’s VIN during checkout, and our experts will program this module with the latest GM software specific to your exact build. It arrives at your door ready for installation, saving you hundreds of dollars and significant downtime. It’s a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU.
From the Diagnostic Bay: The Case of the Ghostly Windows
A customer brought in his ’02 Silverado, convinced both his power window motors were shot. They’d work one day and not the next. He’d already spent money on new switches to no avail. Instead of just replacing parts, I hooked up my scan tool and saw multiple communication loss codes with the door modules. This immediately pointed me away from the motors and toward the central controller. A failing GM Body Control Module was intermittently dropping communication, causing the erratic behavior. We installed a VIN-programmed BCM, and all the “bad” components magically started working perfectly. It’s a classic scenario that shows how diagnosing the root cause saves time and money.
Is Your GM Truck or Van Showing These Symptoms?
A faulty BCM can cause a wide range of confusing electrical issues. Here are the most common signs that your module needs replacement:
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security or anti-theft system light flashing, preventing the vehicle from starting (Passlock issues).
- ✔ Horn randomly sounding or not working when pressed.
- ✔ Wipers behaving erratically (e.g., won’t turn off).
- ✔ Diagnostic trouble codes (DTCs) related to communication errors, such as U1000, or specific BCM codes like B1000 or B1001.
A Straightforward Guide to BCM Replacement
This installation is manageable for a DIY enthusiast with basic tools. The location can vary, so confirm whether your BCM is under the steering column or behind the center dash trim.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before starting work.
- Locate the Module: On most trucks/SUVs (Silverado, Sierra, Tahoe), it’s under the driver’s side dash, near the steering column. On vans (Astro, Safari) and S10/Blazer models, it’s often behind the center dash/radio area.
- Remove Connectors: Carefully unplug the multiple electrical connectors from the old BCM. They have locking tabs that need to be pressed to release. Do not force them.
- Swap the Module: Unbolt or unclip the old BCM from its mounting bracket and remove it. Install the new, pre-programmed module in its place.
- Reconnect & Test: Plug all connectors firmly back into the new module. Reconnect the battery terminal and test all functions—windows, locks, lights, etc.
Important Post-Installation Notes
While this module is programmed for your VIN, some vehicle systems may require a ‘handshake’ procedure after installation:
- ✔ Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system. This is only required if the light appears.
- ✔ Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be necessary to ensure correct brake light operation. This can often be done with a capable bidirectional scan tool.
- ✔ No Core Charge: You are not required to send your old module back to us. Keep it, discard it—the choice is yours.
Verified Compatibility for Your Vehicle
This module is a guaranteed fit for the following GM vehicles. Please match your vehicle, year, and any specific notes provided.
- Astro Van: 2002-2005 (Body Control, center dash)
- Avalanche 1500: 2002 (Body Control, under steering column, 4×2)
- Blazer S10 / Jimmy S15: 2002-2005 (Body Control, center dash)
- Escalade: 2002 (Body Control, under steering column, 4×2)
- S10 / S15 / Sonoma Pickup: 2002-2004 (Body Control, center dash)
- Safari Van (GMC): 2002-2005 (Body Control, center dash)
- Sierra 1500 / 2500 / 3500 Pickup: 2002 (Body Control, under steering column)
- Sierra Denali: 2002 (Body Control, under steering column)
- Silverado 1500 / 2500 / 3500 Pickup: 2002 (Body Control, under steering column)
- Suburban 1500 / 2500: 2002 (Body Control, under steering column, 4×2 for 1500)
- Tahoe: 2002 (Body Control, under steering column, 4×2)
- Yukon / Yukon XL 1500 / Yukon XL 2500: 2002 (Body Control, under steering column, 4×2 for Yukon/XL 1500)
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Just provide your vehicle’s VIN at checkout, and it will arrive ready to install with the latest GM software.
What exactly does a BCM do?
The Body Control Module acts as the central computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, interior/exterior lighting, security system, wipers, and more.
Where is this GM Body Control Module located on my truck?
It’s typically in one of two places. For most full-size trucks and SUVs (like Silverado/Sierra/Tahoe), it’s located under the driver’s side dashboard. For vans (Astro/Safari) and smaller trucks/SUVs (S10/Blazer), it is often behind the center dash trim, near the radio.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the specific software and calibrations GM designed for your vehicle’s exact options. This ensures perfect compatibility and function without requiring a trip to the dealer.
Is there a core charge or do I have to return my old part?
No, there is absolutely no core charge. You can keep your old module.
What if my airbag light comes on after I install it?
This is uncommon, but if it happens, it means the new BCM needs to be electronically synced with the airbag’s computer (SDM). This procedure, called ‘Setup SDM Primary Key in BCM’, must be performed by a mechanic with a professional-grade diagnostic tool.