Restore Full Electrical Function to Your GM SUV
Is your Trailblazer, Envoy, or Bravada suffering from baffling electrical issues? Unresponsive power windows, erratic interior lights, or strange warning messages on the dash are often symptoms of a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, and when it malfunctions, it can cause a cascade of frustrating problems. This replacement BCM, part number 15122670, is the definitive solution to restore your vehicle’s proper operation and reliability.
The Plug-and-Play Solution You Need
Don’t waste time and money at the dealership with expensive programming fees. We take the guesswork out of the repair. When you purchase this module, we will flash it with the latest official GM software, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless integration and functionality right out of the box. Simply provide your VIN after purchase, and we’ll ship a BCM that is ready for installation, saving you hundreds in labor and diagnostic costs.
From the Diagnostic Bay
We had a 2004 GMC Envoy come into the shop with a laundry list of complaints from the owner. The dome lights would stay on, the driver’s side window wouldn’t go down, and the radio would randomly shut off. The owner had already replaced the window switch and checked fuses to no avail. After hooking up our professional scan tool, we noticed a loss of communication with multiple accessory modules. All signs pointed to the central hub – the BCM. Instead of a complex rewiring job, the fix was a new, properly programmed BCM. Once installed, all the gremlins vanished. It’s a perfect example of how this single component can solve a dozen different problems.
Common Symptoms of a Failing Trailblazer Envoy BCM
- ✔ Power windows, door locks, or mirrors operating intermittently or not at all.
- ✔ Interior or exterior lights behaving erratically (staying on, not turning on, or flickering).
- ✔ The security system preventing the vehicle from starting.
- ✔ Inaccurate or non-functional gauges on the instrument cluster.
- ✔ Warning lights (like ABS or Airbag) illuminating for no apparent reason.
- ✔ HVAC (heater and A/C) controls not responding correctly.
- ✔ Communication errors with diagnostic scan tools.
Installation and Post-Install Considerations
This BCM is located on the front fuse box. While the physical replacement is straightforward for a DIY mechanic, some vehicles may require additional electronic ‘handshake’ procedures after installation. Please be aware of the following potential steps:
- Airbag System Sync: If your airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration to ensure the brake lights and traction control systems function correctly.
We ensure this module is programmed for your VIN, which handles the most critical part of the process. There is no core charge, so you can keep your original module. This part is a direct replacement for part numbers: 15122670, 15065293, 15114669, 15191621, and 9352135.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine related functions. This includes power windows, door locks, interior and exterior lighting, security systems, wipers, and HVAC controls.
Do I need to get this BCM programmed by a dealer?
No. We handle the programming for you before we ship the part. Simply provide us with your vehicle’s VIN during checkout, and the module will arrive ready to be installed.
Where is the BCM located on my 2003 Trailblazer?
On most GMT360 platform vehicles (Trailblazer, Envoy, etc.), the BCM is integrated with or located on the side of the interior fuse box, typically found under the rear driver’s side seat or on the driver’s side of the center console.
What happens if I forget to provide my VIN?
We cannot ship the module without your VIN, as the programming is essential for it to work in your vehicle. Our team will contact you to retrieve the VIN, which may delay your order. Please provide it at the time of purchase for the fastest service.
Will this fix my power window and door lock problems?
If the BCM is the root cause of the failure, then yes, this part will resolve those issues. A faulty BCM is the most common reason for multiple electrical accessories failing simultaneously.
What tools are needed for the post-installation procedures?
The Airbag System Sync and Brake Pedal Position Relearn procedures require a bi-directional professional diagnostic tool (scan tool) that can perform specific vehicle functions. Many local repair shops have this equipment.