Restore Your Vehicle’s Electrical Functions
Are you experiencing frustrating and unpredictable electrical problems in your GM SUV? Issues like flickering dashboard lights, malfunctioning power windows and locks, or a security system that acts on its own are common signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can create a cascade of confusing problems. This replacement Body Control Module, part number 15787809, is the definitive solution to restore your vehicle’s functionality and peace of mind.
Is Your BCM Failing? Common Symptoms
A faulty BCM can manifest in numerous ways, often seeming like multiple unrelated problems. If your Trailblazer, Envoy, Rainier, or other compatible model is showing these signs, a failing BCM is the likely culprit:
- ✔ Erratic power windows, door locks, or mirrors that work intermittently or not at all.
- ✔ Interior dome lights, headlights, or taillights staying on or not turning on.
- ✔ The horn honking randomly or failing to work when needed.
- ✔ Instrument cluster gauges behaving strangely or providing inaccurate readings.
- ✔ The security system engaging without reason or preventing the vehicle from starting.
- ✔ Remote keyless entry (RKE) system failure.
- ✔ Warning messages like “Service Vehicle Soon” appearing on the dash.
The Simple, Programmed Solution for Your 2005-2006 Trailblazer BCM
Don’t let a faulty module keep your vehicle sidelined. We make the repair process straightforward. This BCM is not just a replacement part; it’s a complete, ready-to-install solution. We flash the unit with the latest stable software updates from GM and then program it specifically to your vehicle’s 17-digit VIN. This critical step ensures that the module communicates perfectly with your vehicle’s existing systems and options, eliminating the need for an expensive trip to the dealership for programming.
Installation and Post-Install Procedures
Installation is a direct swap for your original module, which is typically located as part of the fuse box assembly. Once installed, most functions will be immediately restored. However, depending on your specific vehicle, a couple of additional steps may be necessary:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a “Setup SDM Primary Key in BCM” procedure is required. This syncs the new BCM with the airbag system and must be performed with a professional-grade diagnostic tool.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control operation, a brake pedal position sensor recalibration might be needed. This is also performed with a compatible scan tool.
This module is a direct replacement for part numbers: 25802312, 8258023120, 15135466, and 15787809.
Guaranteed Fitment For:
- ✔ Buick Rainier: 2005-2007 (w/o security system)
- ✔ Chevrolet Trailblazer: 2005-2009 (w/o security system)
- ✔ Chevrolet Trailblazer EXT: 2005-2006 (w/o security system)
- ✔ GMC Envoy: 2005-2009 (w/o security system)
- ✔ GMC Envoy XL: 2005-2006 (w/o security system)
- ✔ Isuzu Ascender: 2005-2008 (2005-2007 models w/o security system)
- ✔ Saab 9-7X: 2006-2009
Frequently Asked Questions
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
Is this BCM truly plug-and-play?
Yes, we program it to your VIN before shipping for a simple installation. However, some vehicles may require a simple relearn procedure for the airbag system or brake pedal sensor, which must be done with a professional scan tool.
What information do you need from me?
After you place your order, you will need to provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). This is essential for us to program the BCM correctly for your specific options.
Will this fix my specific problem?
This module will correct issues directly caused by a faulty BCM. It is crucial to properly diagnose the problem first, as other issues like bad wiring, faulty switches, or corroded grounds can cause similar symptoms.
Where is the BCM located on my Trailblazer or Envoy?
The BCM is typically integrated with the fuse box located under the rear driver’s side seat. The entire fuse box assembly is often removed to access and replace the module.