Restore Full Electrical Function to Your GM SUV
Are you battling frustrating and unpredictable electrical problems in your GMC Envoy, Chevy Trailblazer, or other compatible GM SUV? Issues like flickering lights, malfunctioning power windows and locks, or a vehicle that refuses to start can often be traced back to a single, critical component: the Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can create a cascade of confusing and disruptive symptoms. This replacement Body Control Module, part number 15787809, is the definitive solution to restore your vehicle’s electronic stability and reliability.
From the Diagnostic Bay
We had a 2006 Trailblazer come into the shop with a classic “parasitic draw” complaint. The owner had replaced the battery twice, but it would still be dead every few mornings. Standard tests showed a significant draw, but pulling fuses was inconclusive. The draw seemed to jump around. We suspected the BCM was failing to put all the vehicle’s accessory circuits to sleep properly after shutdown. Instead of replacing it with a blank module and towing it to the dealer for programming, we installed one of our VIN-programmed units. The draw disappeared immediately, and the customer was thrilled to have a reliable vehicle again without the extra hassle and cost of dealer programming.
Common Symptoms of a Failing BCM
A faulty Body Control Module can manifest in numerous ways, often making diagnosis difficult. If your vehicle is experiencing any of the following, a failing BCM is a likely culprit:
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic behavior from interior or exterior lights (flickering, staying on, or not turning on).
- ✔ Malfunctioning dashboard gauges or warning lights that illuminate for no reason.
- ✔ Problems with the radio or climate control systems.
- ✔ A vehicle that won’t start, even with a good battery and starter.
- ✔ Issues with the anti-theft or keyless entry systems.
- ✔ Unexplained battery drain that leaves you with a dead battery.
The Plug-and-Play Solution: A Pre-Programmed 2005-2006 Envoy BCM
Replacing a BCM used to be a complicated job requiring expensive dealership-level tools for programming. Our process eliminates that headache. We offer a direct-fit 2005-2006 Envoy BCM that arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest GM software updates, ensuring optimal performance and compatibility. This means no extra trips to a mechanic or dealer for costly programming. Simply provide us with your VIN during checkout, and we handle the rest.
Installation and Post-Install Considerations
This module is designed for a straightforward installation, typically located within the vehicle’s main fuse box area. While the programming is done for you, some vehicles may require simple relearn procedures after the new BCM is installed. These are not programming steps but rather synchronization procedures to ensure all related vehicle systems communicate correctly.
- Airbag System Sync: In some cases, the airbag warning light may illuminate after installation. This indicates the new BCM needs to be synchronized with the SDM (airbag module). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to clear the light.
- Brake Pedal Position Relearn: To ensure correct brake light operation and stability control function, a brake pedal position sensor recalibration might be necessary.
- No Core Charge: You are not required to send your old module back. There is no core charge associated with this purchase.
Please note: Specific procedures can vary. We always recommend consulting a factory service manual or a qualified technician for guidance.
Guaranteed Fitment
This BCM is a direct replacement for several part numbers and fits a wide range of GM SUVs. Please verify your vehicle is on the list below. This module is compatible with vehicles originally equipped with part numbers: 25802312, 8258023120, 15135466, and 15787809.
- 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 (w/o security system for 05-07)
- Saab 9-7x: 2006-2009
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. This is the primary benefit of our service. We program the module to your vehicle’s specific VIN before we ship it to you. It arrives ready for installation, saving you time and money.
Where is the BCM located on my 2005 Envoy?
The Body Control Module on this platform is typically integrated with the front fuse box, which is usually located under the rear seat on the driver’s side. Always confirm the location in a service manual for your specific model.
What happens if I don’t provide my VIN?
Providing your VIN is mandatory for this part. We cannot program or ship the module without it, as it would not function correctly in your vehicle. Your order will be placed on hold until the VIN is received.
Will this fix my intermittent no-start problem?
A failing BCM is a very common cause of no-start or intermittent starting conditions in these SUVs, as it plays a key role in the vehicle’s security and starting sequence. While this module often resolves the issue, you should always ensure your battery, starter, and ignition switch are in good working order as well.
Is any special tool required for the post-installation procedures?
While the physical installation requires only basic hand tools, the potential post-install procedures like the Airbag System Sync or Brake Pedal Position Relearn require a professional-grade bidirectional scan tool. Many local repair shops can perform these quick procedures for you if needed.