Restore Your Vehicle’s Electrical System with a Reliable BCM
Are you chasing electrical gremlins in your GM truck, van, or SUV? Flickering lights, power windows with a mind of their own, a security light that won’t turn off, or intermittent no-start conditions are classic signs of a failing Body Control Module (BCM). As the central command center for your vehicle’s body electronics, a faulty BCM can cause a host of frustrating and seemingly unrelated problems. Stop throwing parts at the issue and get the definitive solution.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the hassle out of the repair by pre-programming this 2002-2004 GM Body Control Module to your vehicle’s specific Vehicle Identification Number (VIN). Simply provide us with your VIN after purchase, and our technicians will flash the module with the latest GM software updates. This ensures seamless integration and functionality right out of the box, saving you from a costly and time-consuming trip to the dealership for programming.
Case Study: A Tricky Diagnosis
A customer’s 2002 GMC Sierra 2500 came into the shop last month with a bizarre list of complaints. The radio would turn on and off randomly, the dome light wouldn’t work, and occasionally, the truck wouldn’t start, with only a ‘Security’ light on the dash. The owner had already replaced the battery and checked all the fuses. After connecting my scan tool, I noticed communication errors between several modules. In my 20+ years of experience, this pattern almost always points back to the BCM. We installed one of our VIN-programmed modules, and within an hour, every single issue was resolved. The BCM was the root cause, acting as a faulty switchboard for the truck’s entire electrical system.
Is Your GM Vehicle Showing These Symptoms?
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or don’t work at all.
- ✔ The security system light is illuminated, preventing the engine from starting.
- ✔ The horn honks unexpectedly or doesn’t work when pressed.
- ✔ Warning messages on the driver information center (e.g., “Service Electrical System”).
- ✔ Intermittent issues with the radio or climate controls.
Your Straightforward BCM Installation Guide
Replacing the BCM is a manageable job for a confident DIYer. Follow these general steps for a successful installation. Note: The BCM location varies; it’s typically under the steering column on trucks/SUVs and in the center dash on vans.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electrical components.
- Locate the BCM: Find the original BCM in your vehicle. It’s a small plastic box with several large wiring harnesses connected to it.
- Disconnect and Remove: Carefully unplug all wiring connectors. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module and remove it.
- Install the New Module: Mount your new, pre-programmed BCM in the same location and securely reconnect all the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Post-Installation Procedures (CRITICAL): After installation, you must perform two key procedures with a capable bi-directional scan tool. Failure to do so can result in warning lights and improper system function.
- Airbag System Reset: Perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the BCM with the airbag module (SDM) and turns off the airbag warning light.
- Brake System Check: Some vehicles require a brake pedal position sensor recalibration. This ensures the brake lights and stability control systems function correctly. Consult your service manual for specifics.
Verified Fitment For These GM Vehicles
This module is a direct replacement for part numbers 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. Please verify your part number or match your vehicle from the list below. Note that some models require matching the ID number on your original BCM.
- Astro / Safari (GMC): 2002-2005 (Center Dash Location)
- Avalanche 1500 (4×2): 2002 (Under Steering Column)
- Blazer S10 / Jimmy S15: 2002-2005 (Center Dash Location)
- Escalade (4×2): 2002 (Under Steering Column)
- S10 / S15 / Sonoma: 2002-2004 (Center Dash Location)
- Sierra 1500 / 2500 / 3500 / Denali: 2002 (Under Steering Column)
- Silverado 1500 / 2500 / 3500: 2002 (Under Steering Column)
- Suburban 1500 / 2500: 2002 (Under Steering Column, 4×2 for 1500)
- Tahoe (4×2): 2002 (Under Steering Column)
- Yukon / Yukon XL 1500 / Yukon XL 2500: 2002 (Under Steering Column, 4×2 for Yukon/XL 1500)
Frequently Asked Questions about the 2002-2004 GM Body Control Module
Do I really need to provide my VIN?
Yes, providing your VIN is essential. This allows us to program the BCM with the correct software and vehicle-specific options, ensuring it works correctly as soon as you install it. This step saves you a trip to the dealer.
Will this fix my no-start problem?
If your no-start issue is accompanied by a lit ‘Security’ light on the dashboard, a faulty BCM is a very likely cause. This module is the core of the Passlock/Passkey security system, and replacing it often resolves these specific anti-theft-related starting problems.
What tools are needed for the post-installation procedures?
You will need a professional-grade, bi-directional scan tool that can perform specific GM procedures like ‘Setup SDM Primary Key in BCM’ and brake pedal position sensor relearns. Basic code readers cannot perform these functions.
My original part number is DPNU. Will this DKAK module work?
Yes. This BCM is a direct replacement for all listed part numbers, including 15063578, 15081796, 15095334, 19208537, DKAK, and DPNU. We program it to your VIN, which makes it compatible with your vehicle’s systems regardless of the original part number.
Where is the BCM located on a 2002 Silverado?
On most 2002 GM full-size trucks and SUVs like the Silverado, Sierra, Tahoe, and Suburban, the BCM is located under the driver’s side of the dashboard, usually to the left of the steering column.