Restore Full Electrical Function to Your GM SUV
Is your 2002-2005 GMC Envoy XL, Chevrolet Trailblazer, or other GM SUV experiencing a host of strange and frustrating electrical issues? The Body Control Module (BCM) is the central command center for your vehicle’s body electronics, and when it fails, it can cause a cascade of problems that seem unrelated. From power windows that won’t roll down to interior lights that won’t turn off, a faulty BCM can make your vehicle unreliable and difficult to use. This replacement BCM is the definitive solution, arriving at your door fully programmed to your vehicle’s specific VIN with the latest GM software updates.
From the Diagnostic Bay
We had a 2004 Trailblazer come into the shop with a classic case of BCM failure. The customer complained of a dead battery every morning and the radio randomly turning on and off. After checking the battery and alternator, we traced the parasitic draw back to the BCM, which wasn’t allowing the vehicle’s systems to properly go to sleep. Swapping in a VIN-programmed BCM like this one not only solved the battery drain but also fixed a flickering dome light the customer had forgotten to mention. It’s a perfect example of how this single component can resolve multiple, seemingly disconnected electrical gremlins.
Is Your Envoy XL BCM Failing?
A failing Body Control Module can manifest in numerous ways. If you’re noticing any of the following symptoms, a faulty BCM is the most likely culprit:
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior dome lights or exterior lamps staying on, flickering, or failing to illuminate.
- ✔ The instrument cluster displaying incorrect information or gauges behaving erratically.
- ✔ Unexplained and persistent battery drain that kills your battery overnight.
- ✔ The vehicle’s security system malfunctioning or the security light staying on.
- ✔ Horn, wipers, or radio not functioning correctly.
- ✔ Diagnostic trouble codes (DTCs) indicating a loss of communication with other modules.
The Plug-and-Play Solution
Don’t waste time and money on a trip to the dealership for expensive programming. We handle the complex part for you. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the correct software and calibrations for your exact vehicle configuration. This ensures a seamless installation process, restoring all functions as intended by the factory. This service makes replacing your Envoy XL BCM a straightforward DIY job for many owners.
Installation and Post-Install Notes
This BCM is typically located on the front fuse box. While the installation is plug-and-play, some vehicles may require a couple of simple relearn procedures after the new module is connected. These are not always necessary but are good to be aware of:
- Airbag System Sync: If your airbag warning light illuminates after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This syncs the new BCM with the airbag system and requires a professional-grade scan tool.
- Brake Pedal Position Relearn: In some cases, a recalibration of the brake pedal position sensor may be required to ensure proper brake light and traction control operation.
Always consult a factory service manual or a qualified technician if you are unsure about any step of the installation process.
Guaranteed Compatibility
This module is a direct replacement for part numbers 15122670, 15065293, 15114669, 15191621, and 9352135. It fits a wide range of GM SUVs, including:
- Chevrolet Trailblazer & Trailblazer EXT (2002-2005)
- GMC Envoy, Envoy XL, & Envoy XUV (2002-2005)
- Oldsmobile Bravada (2002-2004)
- Buick Rainier (2004-2005)
- Isuzu Ascender (2003-2005)
- Saab 9-7x (2005)
Frequently Asked Questions
What does the Body Control Module (BCM) do?
The BCM acts as the central computer for your vehicle’s body electronics. It controls functions like power windows, locks, interior/exterior lighting, wipers, the security system, and more.
Do I need to have this BCM programmed by a dealer?
No. We program the module to your vehicle’s VIN before shipping it to you. It arrives ready to install, saving you a costly trip to the dealership.
Where is the BCM located on my 2003 GMC Envoy?
On most compatible models, including the GMC Envoy, the BCM is integrated with or located next to the interior fuse box, typically under the driver’s side of the dashboard.
What if the airbag light comes on after I install the new BCM?
This indicates the new BCM needs to be synced with the airbag module (SDM). A technician with a professional scan tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to turn off the light.
Is this a difficult part to replace myself?
For someone with basic mechanical skills, the physical replacement is straightforward. The module is typically easy to access. The key is that our pre-programming service eliminates the most difficult step, making it a viable DIY repair.