Is Your GM SUV Plagued by Electrical Gremlins?
If your Buick Rainier, GMC Envoy, or Chevy Trailblazer is acting possessed—with flickering lights, malfunctioning power windows, erratic door locks, or strange warning messages on the dash—you’re likely dealing with a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, coordinating everything from the interior lights and power accessories to the anti-theft system. When it fails, it can cause a cascade of frustrating and seemingly unrelated issues that can make your vehicle difficult and unpleasant to drive.
Ignoring a faulty BCM won’t make the problem go away. In fact, symptoms typically worsen over time, potentially leading to a no-start condition or leaving you stranded. Dealerships will charge a premium for a new module, plus additional fees for programming and labor. We offer a more direct and cost-effective solution: a high-quality replacement BCM, pre-programmed to your vehicle’s specific VIN, ready for installation right out of the box.
Symptoms of a Failing Body Control Module
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security or anti-theft system light is illuminated, preventing the engine from starting.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Dashboard warning lights appearing for no reason.
- ✔ Wipers behaving erratically or not parking in the correct position.
- ✔ Communication errors with other vehicle modules when checked with a diagnostic scanner.
The Direct-Fit Solution: A Programmed 2005-2007 Rainier BCM
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and hassle out of the repair process. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program this module with the latest GM-certified software specific to your vehicle’s options and configuration. This ensures that all electronic features function exactly as they did from the factory. This critical programming step is what makes our module a superior choice, saving you a trip to the dealer and the high cost of their programming services.
Installation and Post-Install Procedures
This BCM is located on the front of the interior fuse box. Installation is straightforward for a DIYer with basic tools or any professional mechanic. While our programming makes the process as simple as possible, some GM vehicles may require a couple of minor follow-up procedures after the new module is installed. These are not always necessary but are important to be aware of:
- Airbag System Sync: If your airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-level scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration may be needed to ensure proper brake light and traction control operation.
Guaranteed Fitment for Your Vehicle
This Body Control Module is a direct replacement for the following part numbers:
- 15787809
- 25802312
- 8258023120
- 15135466
It is confirmed to fit the following vehicles (without security system option where noted):
- 2005-2007 Buick Rainier
- 2005-2009 Chevrolet Trailblazer & Trailblazer EXT
- 2005-2009 GMC Envoy, Envoy XL, & Envoy XUV
- 2005-2008 Isuzu Ascender
- 2006-2009 Saab 9-7X
Don’t let a faulty BCM compromise your vehicle’s safety and functionality. Order today, provide your VIN, and get your vehicle back to perfect working order with a reliable, fully programmed Body Control Module.
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s 17-digit Vehicle Identification Number (VIN) contains all the specific information about its factory-installed options. We use the VIN to load the exact, correct software and calibrations from GM onto the BCM. This ensures all features, from power windows to drivetrain settings, work perfectly in your specific vehicle.
Is this BCM difficult to install?
The physical installation is relatively simple. The BCM is typically located on the interior fuse panel. The main challenge is usually accessing it under the dashboard. For anyone with basic mechanical skills, it’s a manageable job. The key benefit of our service is that the complex programming is already done for you.
What happens if the airbag light comes on after I install it?
This can happen because the new BCM needs to be electronically ‘introduced’ to the airbag’s Sensing and Diagnostic Module (SDM). A professional mechanic with a high-level scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to sync the modules and turn off the light.
Will this fix my no-start problem?
If your no-start issue is caused by the BCM failing to recognize your key’s anti-theft chip (a common failure), then yes, this programmed BCM will resolve the problem. However, a no-start condition can have many other causes, such as a bad starter or fuel pump, so proper diagnosis is always recommended.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.