Is Your SUV Plagued by Electrical Gremlins?
Are you dealing with flickering lights, malfunctioning power windows, erratic door locks, or a dashboard that seems to have a mind of its own? These frustrating and unpredictable electrical issues often point to a single culprit: a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, coordinating everything from your interior lights and power accessories to security functions. When it starts to fail, it can make driving your vehicle an unreliable and annoying experience.
This replacement Body Control Module, part number 15114669, is the definitive solution for restoring your vehicle’s electronic stability and functionality. Specifically designed for a wide range of GM SUVs including the 2003-2005 Isuzu Ascender, Chevrolet Trailblazer, GMC Envoy, and more, this module eliminates the guesswork and dealer-level expense. We take care of the most critical step for you: programming the module to your vehicle’s specific VIN before it ships. This ensures a streamlined installation process and restores your vehicle’s features to factory-correct operation.
From the Diagnostic Bay
We had a 2004 Trailblazer come into the shop with a laundry list of bizarre symptoms. The radio would turn on and off by itself, the driver’s side window wouldn’t roll down, and the dome lights would stay on, draining the battery overnight. The owner had already replaced the battery and checked all the fuses. After connecting our scan tool, we saw multiple communication errors pointing towards the BCM. Instead of a costly and time-consuming trip to the dealer, we installed one of our VIN-programmed modules. After a straightforward installation and a quick brake pedal position relearn, all the strange electrical issues were gone. The vehicle was back to normal, and the owner was relieved to have a reliable truck again. It’s a classic case of how a single failing module can cause widespread chaos.
Symptoms of a Failing Body Control Module
If you’re experiencing any of the following issues, a faulty BCM is the likely cause. Replacing it can resolve these problems and restore your peace of mind.
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that flicker, stay on, or don’t turn on at all.
- ✔ The security system or horn activating randomly.
- ✔ Inaccurate or malfunctioning gauges on the instrument cluster.
- ✔ Warning lights on the dashboard that have no apparent cause.
- ✔ Problems with the heating and A/C blower motor controls.
- ✔ Communication errors with other vehicle modules when using a diagnostic scan tool.
The Perfect Solution for Your 2003-2005 Isuzu Ascender BCM
Don’t let a faulty module dictate how your vehicle behaves. This replacement BCM is a reliable, direct-fit part that integrates seamlessly with your SUV’s existing systems. The key benefit is our professional programming service. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash the module with the latest GM software specific to your vehicle’s configuration. This means no expensive trips to the dealership for programming after installation.
Installation and Post-Install Procedures
This BCM is typically located at the front of the vehicle, integrated with the interior fuse box. While the physical replacement is straightforward for a DIY-er with basic tools, some post-installation steps may be required to ensure all systems communicate correctly.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure must be performed with a professional-grade scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure correct brake light operation and to prevent issues with the traction control system.
Please note: Specific procedures can vary. We always recommend consulting a factory service manual or a qualified technician for guidance.
Guaranteed Fitment
This module is a direct replacement for the following part numbers: 15122670, 15065293, 15114669, 15191621, 9352135. It is confirmed to fit the following vehicles:
- 2003-2005 Isuzu Ascender
- 2002-2005 Chevrolet Trailblazer & Trailblazer EXT
- 2002-2005 GMC Envoy, Envoy XL & Envoy XUV
- 2002-2004 Oldsmobile Bravada
- 2004-2005 Buick Rainier
- 2005 Saab 9-7X
This module is for vehicles without the factory security system option. Please verify your vehicle’s options before ordering.
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 electronic functions. This includes power windows, door locks, interior and exterior lighting, security systems, wipers, and climate control fans.
Why does this BCM need to be programmed to my VIN?
Programming the BCM with your vehicle’s VIN ensures that it has the correct software and settings for your specific model, trim, and options. This allows it to communicate properly with other modules in the vehicle and operate all features as intended from the factory.
Do I need to send my old BCM back?
No. This purchase comes with no core charge. You can keep your original module.
How do I provide my VIN?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive this information.
What if my airbag light is on after I install the BCM?
This is a known possibility. The new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ will need to be performed by a mechanic with a professional diagnostic tool to resolve this.
Is this BCM difficult to install?
The physical installation is generally straightforward for those with some mechanical experience, as it’s part of the interior fuse panel. However, due to the potential need for post-installation electronic procedures like the airbag sync or brake sensor relearn, we recommend professional installation if you are not equipped with a high-level scan tool.