Is Your GM SUV Plagued by Electrical Gremlins?
If you’re dealing with flickering lights, unresponsive power windows, or a dashboard that has a mind of its own, a failing Body Control Module (BCM) is the most likely culprit. The BCM is the central nervous system for your vehicle’s body electronics, managing everything from the interior dome lights and power locks to the windshield wipers and security system. When it starts to fail, it can create a cascade of frustrating and unpredictable problems that can be difficult to diagnose.
Don’t let a faulty module keep your truck off the road. This is a direct-fit replacement Body Control Module, specifically for a wide range of 2002-2005 GM SUVs like the Chevrolet Trailblazer, GMC Envoy, Oldsmobile Bravada, and more. We take the guesswork and high cost out of the repair by pre-programming the module to your vehicle’s specific VIN before it ships. This ensures all your original features and options work exactly as they did from the factory, without requiring a trip to the dealership for expensive programming.
From the Diagnostic Bay
We had a 2004 GMC Envoy come into the shop with a classic BCM failure symptom: the battery was dead every morning. The owner had already replaced the battery and alternator. After a quick parasitic draw test, we found the interior lights were staying on dimly even when the truck was off and locked. The BCM, which controls the retained accessory power and lighting timers, had an internal short. Swapping in a VIN-programmed BCM like this one solved the battery drain and restored all interior functions instantly. It’s a common issue on these GMT360 platform vehicles.
Symptoms of a Failing Trailblazer Envoy BCM
A faulty BCM can manifest in numerous ways. If you’re experiencing any of the following, this module is the solution you need:
- ✔ Power windows or door locks working intermittently or not at all.
- ✔ Interior or exterior lights staying on, not turning on, or flickering.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Windshield wipers behaving erratically (e.g., won’t turn off).
- ✔ Inaccurate or non-functional gauges on the instrument cluster.
- ✔ Communication errors when using a diagnostic scan tool.
- ✔ Warning lights (like the airbag light) appearing for no reason.
Plug-and-Play Installation & Post-Install Procedures
Our goal is to make your repair as simple as possible. After you place your order, simply provide us with your vehicle’s VIN. Our technicians will flash the module with the latest GM software updates specific to your truck. The module arrives at your door ready for installation. In most cases, it’s a straightforward plug-and-play process. However, due to the complex integration of modern vehicle systems, a couple of post-installation steps may be necessary:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a simple ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag system and can be performed with a professional-grade scan tool.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure proper brake light and traction control operation.
This module is a reliable and cost-effective solution to restore your vehicle’s full functionality. There is no core charge, so you can keep your original module. Get your GM SUV back in top electrical condition and order today!
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide 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 like the Trailblazer, Envoy, and Bravada, the BCM is integrated into the front interior fuse box assembly, typically located under the rear seat or on the driver’s side of the center console.
What if my airbag light is on after I install the new BCM?
This is a common occurrence and is easily resolved. The new BCM needs to be electronically ‘introduced’ to the airbag’s Sensing and Diagnostic Module (SDM). A technician with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the modules and turn off the light.
Is this part compatible with my vehicle if my original part number is different?
Yes. This BCM is a direct replacement for multiple part numbers, including 15122670, 15065293, 15114669, 15191621, and 9352135. As long as your vehicle is listed in the fitment chart, this module will work correctly once programmed to your VIN.
Will this fix my power window and lock problems?
A faulty BCM is the most common cause of widespread power window and lock failure on these vehicles. While you should always confirm your diagnosis, if multiple windows and locks are acting up simultaneously, this module is the most probable solution.