Is Your Trailblazer or Envoy Suffering from Electrical Gremlins?
The Body Control Module, or BCM, is the central command center for your vehicle’s electronic accessories. It manages everything from your power windows and door locks to the interior lights and instrument cluster functions. When the BCM starts to fail in your 2002-2005 Trailblazer, Envoy, or other compatible GM SUV, it can cause a cascade of confusing and frustrating issues. You might experience lights that won’t turn off, windows that won’t roll down, or a security system that acts up for no reason. These aren’t just annoyances; they can affect the daily usability and safety of your vehicle.
Don’t let a faulty module keep you guessing. This is a direct-fit replacement Body Control Module, part number 15114669, designed to restore full functionality to your vehicle’s body electronics. The best part? We eliminate the most significant hassle of BCM replacement: programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM software updates specific to your truck. It arrives at your door ready for installation, saving you a costly trip to the dealership and hours of diagnostic headaches.
From the Diagnostic Bay
We had a 2004 Envoy come in with the classic complaint: “The driver’s side window and locks work sometimes, but not always.” The owner had already replaced the master window switch and even the window motor, with no success. After a quick scan, we saw communication fault codes pointing to the BCM. A faulty BCM can send intermittent or incorrect signals, making other perfectly good parts seem broken. By installing a pre-programmed 2002-2005 Trailblazer BCM, we resolved all the electrical issues in one go, saving the customer from further unnecessary parts-swapping and expense.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ Instrument cluster gauges behaving erratically or warning lights appearing incorrectly.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Problems with the radio, climate control, or other interior accessories.
- ✔ Diagnostic trouble codes (DTCs) related to communication errors (U-codes).
Installation and Post-Install Procedures
This module is designed for a straightforward installation. It is typically located on or near the front fuse box. Once the new module is installed, it is plug-and-play. However, depending on your specific vehicle, a couple of simple relearn procedures may be necessary 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 scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration might be needed to ensure proper operation of the brake lights and traction control system.
We’ve also made this process easier by eliminating the need for a core return. There is no core charge, so you can keep your original module.
Guaranteed Fitment for Your GM SUV
This 2002-2005 Trailblazer BCM is a direct replacement for multiple part numbers, including 15122670, 15065293, 15114669, 15191621, and 9352135. It is compatible with a wide range of GM models:
- Chevrolet Trailblazer & Trailblazer EXT: 2002, 2003, 2004, 2005
- GMC Envoy, Envoy XL, & Envoy XUV: 2002, 2003, 2004, 2005
- Oldsmobile Bravada: 2002, 2003, 2004
- Buick Rainier: 2004, 2005
- Isuzu Ascender: 2003, 2004, 2005
- Saab 9-7X: 2005
Please verify your vehicle’s options (e.g., with/without security system) to ensure a perfect match.
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it to you. It arrives ready for installation, saving you time and money.
What information do you need from me?
After you place your order, you must provide us with your 17-digit Vehicle Identification Number (VIN). We cannot process and ship your order without it.
Where is the BCM located on my 2003 Trailblazer?
On most GMT360 platform vehicles like the Trailblazer, Envoy, and Bravada, the BCM is located in the front of the cabin, integrated with or mounted next to the interior fuse box.
What happens if my airbag light comes on after installation?
This is a known possibility. It simply means the new BCM needs to be electronically introduced to the airbag module. A technician with a professional-grade scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
Is there a core charge for this part?
No, there is no core charge. You can keep your old module without any additional fees.