Restore Full Electrical Control to Your GM SUV
Are you battling frustrating electrical gremlins in your Isuzu Ascender, GMC Envoy, or Chevy Trailblazer? Issues like malfunctioning power windows, flickering interior lights, unresponsive door locks, or a dead instrument cluster often point to a single culprit: a failing Body Control Module (BCM). The BCM acts as the central nervous system for your vehicle’s body electronics, and when it starts to fail, it can cause a wide range of confusing and intermittent problems. This replacement Body Control Module, part number 15787809, is the definitive solution to restore your vehicle’s functionality and your peace of mind.
From the Diagnostic Bay
We had a 2006 Trailblazer in the shop that was driving its owner crazy. The dome lights would stay on, the power locks worked only when they wanted to, and the radio would randomly shut off. The owner had already replaced the battery and checked all the fuses. After hooking up our diagnostic scanner, we saw multiple communication errors all pointing back to the BCM. It was failing internally, sending corrupt data across the network. Installing a VIN-programmed BCM like this one resolved all the issues in one go. It’s a common failure point on these platforms, but thankfully, it’s a straightforward fix with the right part.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, and mirrors.
- ✔ Interior or exterior lights staying on, flickering, or not turning on at all.
- ✔ Erratic or non-functional instrument cluster gauges.
- ✔ Security system faults or the vehicle not starting.
- ✔ Horn honking unexpectedly or not working.
- ✔ Communication errors with other vehicle modules (DTC U-codes).
- ✔ Inoperative remote keyless entry (RKE) fobs.
Plug-and-Play Solution: The Importance of VIN Programming
Replacing a BCM isn’t as simple as swapping the old one out. These modules are specific to the vehicle’s factory options and security system. Our service eliminates the need for an expensive trip to the dealership for programming. Before we ship your part, we flash it with the latest GM software and program it using the VIN you provide. This ensures that the new 2005-2008 Isuzu Ascender BCM is a perfect match for your vehicle’s configuration, making the installation process as simple as plug-and-play.
Post-Installation Procedures
While our programming handles the critical setup, some vehicles may require minor additional steps after installation to ensure all systems are perfectly synchronized. These are standard procedures that can be performed by a qualified technician with a professional scan tool.
- Airbag System Sync: If the airbag warning light is on after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed to sync the new BCM with the airbag module. This is only required if the light appears.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary to ensure correct brake light operation and traction control functionality.
Please note: Specific procedures can vary. Always consult a factory service manual or a qualified technician for guidance.
Guaranteed Fitment for Your Vehicle
This Body Control Module is a direct replacement for several part numbers and fits a wide range of GM SUVs. Please verify your vehicle and options below to ensure compatibility.
This module is a direct fit for part numbers: 15787809, 15135466, 25802312, 8258023120
Fits the following vehicles:
- 2005-2007 Isuzu Ascender (w/o security system)
- 2008 Isuzu Ascender
- 2005-2009 GMC Envoy (w/o security system)
- 2005-2006 GMC Envoy XL (w/o security system)
- 2005-2009 Chevrolet Trailblazer (w/o security system)
- 2005-2006 Chevrolet Trailblazer EXT (w/o security system)
- 2005-2007 Buick Rainier (w/o security system)
- 2006-2009 Saab 9-7X
Don’t let electrical problems sideline your SUV. By ordering this pre-programmed 2005-2008 Isuzu Ascender BCM, you are getting a reliable and cost-effective solution that gets your vehicle’s features working correctly again.
Frequently Asked Questions
What does the BCM actually do in my vehicle?
The Body Control Module (BCM) is a computer that manages and controls many of your vehicle’s non-engine related electronic functions. This includes power windows, door locks, interior and exterior lighting, the security system, wipers, and the instrument cluster.
Is this BCM ready to install when I receive it?
Yes! This BCM is programmed to your vehicle’s specific VIN before it is shipped. This makes it a plug-and-play installation, saving you a costly trip to the dealership for programming. Some minor relearn procedures may be needed post-installation as noted.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot ship the module until we have programmed it with your VIN.
What if the airbag light comes on after I install the new BCM?
This is a known possibility. It means the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A technician with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules and turn off the light.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module.