Fix Your Truck’s Electrical Gremlins for Good
If you’re dealing with bizarre electrical issues in your 2002 Chevrolet Avalanche or another compatible GM truck, you know the frustration. Flickering lights, power windows with a mind of their own, a security light that won’t turn off, or gauges that randomly die—these are classic signs of a failing Body Control Module (BCM). For over 20 years, I’ve seen these exact problems roll into my shop, and more often than not, the BCM is the culprit. It’s the central nervous system for your vehicle’s comfort and security features, and when it goes, it can cause chaos.
This isn’t just a replacement part; it’s a complete, hassle-free solution. We take this genuine OEM-spec BCM, part number 15095334, and pre-program it with the latest GM software specifically for YOUR truck using the VIN you provide. This means you can skip the expensive trip to the dealership for programming. You get a part that’s ready to install right out of the box, restoring your vehicle’s functions and getting you back on the road with confidence.
From the Diagnostic Bay: A Common GM Truck Scenario
A customer brought in his ’02 Sierra 2500 last month, completely stumped. The radio would turn on and off by itself, the dome light wouldn’t shut off, and worst of all, the truck would intermittently refuse to start, flashing the security light. He’d already replaced the battery and checked the grounds. After hooking up my scanner, I saw communication loss codes with the BCM. Instead of a complex wiring chase, we started with the most common point of failure. We swapped in a pre-programmed BCM, and within an hour, every single one of his electrical gremlins was gone. This is a fix I’ve performed hundreds of times on these GM platforms.
Is Your Truck Showing These Symptoms?
A failing BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the likely solution for your 2002 Avalanche BCM problems:
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security or anti-theft light is illuminated, preventing the engine from starting.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Wipers operating intermittently or not parking in the correct position.
- ✔ False warnings on the driver information center (DIC).
- ✔ Communication issues with diagnostic scan tools.
A Straightforward Guide to Your BCM Installation
Installing your new BCM is a manageable job for a DIYer with basic tools. The key is the pre-programming, which saves you the most difficult step. Follow this process carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the BCM: On most compatible trucks and SUVs like the Avalanche, Tahoe, and Silverado, the BCM is located under the driver’s side of the dashboard, near the steering column. It’s a black plastic box with several large multi-pin connectors.
- Remove the Old Module: Carefully unplug all electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old BCM from its mounting bracket.
- Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical harnesses. Ensure each connector clicks into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Final Procedures: After installation, a couple of critical steps are required. You will need a capable diagnostic tool to perform the ‘Setup SDM Primary Key in BCM’ procedure to clear the airbag light. Some vehicles may also require a Brake Pedal Position Sensor recalibration. If you are not equipped to perform these steps, a local repair shop can complete them quickly.
Will This Fit My Vehicle?
This Body Control Module is a direct replacement for multiple part numbers and fits a wide range of GM vehicles. Please verify your part number or match your vehicle from the list below. This unit is compatible with part numbers: 15063578, 15081796, 15095334, 19208537, DKAK, DPNU.
AVALANCHE 1500 02 (under steering column), 4×2
BLAZER S10/JIMMY S15 02-05 (center dash)
ESCALADE 02 (under steering column), 4×2
S10/S15/SONOMA 02-04 (center dash)
SAFARI (GMC) 02-05 (center dash)
ASTRO 02-05 (center dash)
SIERRA 1500/2500/3500/DENALI 02 (under steering column)
SILVERADO 1500/2500/3500 PICKUP 02 (under steering column)
SUBURBAN 1500/2500 02 (under steering column), 4×2 for 1500
TAHOE 02 (under steering column), 4×2
YUKON & YUKON XL 1500/2500 02 (under steering column), 4×2 for Yukon/XL 1500
Frequently Asked Questions
Do I need to get this 2002 Avalanche BCM programmed by a dealer?
No. The main benefit of our service is that we program the module to your vehicle’s VIN before we ship it. It arrives ready for installation, saving you time and money.
What information do you need from me?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). This is crucial for us to load the correct software for your specific truck.
Will this fix the ‘Security’ light on my dashboard?
Yes, in most cases. A faulty BCM is the most common reason for issues with the GM Passlock/Passkey anti-theft system. Replacing it with a correctly programmed unit typically resolves these starting and security light problems.
Is any special procedure needed after installation?
Yes. As mentioned in the installation guide, you must perform the ‘Setup SDM Primary Key in BCM’ procedure with a scan tool to sync the BCM with the airbag system and turn off the airbag light. A brake pedal recalibration may also be needed.
Where is the BCM located on my 2002 Avalanche?
The Body Control Module is typically found under the driver’s side dashboard, attached near the steering column assembly.