Is Your GM Truck Experiencing Strange Electrical Problems?
If your Trailblazer, Envoy, Rainier, or other GM SUV is suffering from flickering lights, malfunctioning power windows and locks, or a security system that seems to have 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, and when it starts to fail, it can cause a cascade of frustrating and unpredictable issues. Don’t let these electrical gremlins keep you off the road. This direct-fit, VIN-programmed BCM is the reliable and straightforward solution to restore your vehicle’s functionality.
From the Diagnostic Bay
We had a 2004 Chevy Trailblazer come into the shop that was driving the owner crazy. The dome lights would randomly turn on while driving, the radio would shut off unexpectedly, and the power door locks would cycle on their own. The owner had already replaced the battery and checked all the fuses. After hooking up our diagnostic scanner, we saw multiple communication errors pointing towards a faulty BCM. Instead of a costly trip to the dealer for a new module and programming, we installed one of our pre-programmed units. The moment it was plugged in, all the bizarre electrical issues vanished. It was a 15-minute fix that saved the customer hundreds of dollars and a major headache.
Common Symptoms of a Failing GM Body Control Module
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights staying on or not turning on at all.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Dashboard warning lights flickering or illuminating for no reason.
- ✔ Intermittent issues with the radio, climate control, or instrument cluster gauges.
- ✔ A parasitic battery drain that leaves you with a dead battery overnight.
The Plug-and-Play Solution for Your SUV
Replacing a BCM used to mean a mandatory trip to the dealership for expensive programming. We’ve eliminated that step. When you order from us, you simply provide your vehicle’s 17-digit VIN. Our technicians will then program this module with the latest GM-certified software specific to your vehicle’s exact build. This ensures that all the features and options your truck came with from the factory will work correctly right out of the box. It’s a true plug-and-play solution designed for the DIY mechanic or professional technician.
This module is a direct replacement for a range of part numbers, including 15122670, 15065293, 15114669, 15191621, and 9352135. Plus, with our no-core-charge policy, you can keep your original module without the hassle of sending it back.
Installation and Post-Install Procedures
Installation is straightforward. The BCM is typically located behind the fuse panel on the driver’s side or near the floor panel. Simply disconnect the battery, remove the old module, plug in the new one, and reconnect the battery. In most cases, that’s all it takes. However, on some vehicles, a couple of additional steps may be required:
- Airbag System Sync: If your airbag warning light (SRS light) is on after installation, a simple ‘Setup SDM Primary Key in BCM’ procedure must be performed with a compatible high-level scan tool. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control operation, a brake pedal position sensor recalibration might be necessary. This can also be done with a professional diagnostic tool.
Always consult a factory service manual or a qualified technician if you are unsure about any part of the installation process.
Frequently Asked Questions
Do I need to get this BCM programmed by a dealer?
No. This is the biggest benefit of our service. We program the module to your vehicle’s specific VIN before we ship it to you. It arrives ready to be installed.
Where is the BCM located on my Trailblazer or Envoy?
On most GMT360 platform vehicles (Trailblazer, Envoy, Rainier, etc.), the BCM is integrated with the fuse box located under the rear driver’s side seat. Always verify the location for your specific model before beginning work.
What is a VIN and how do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What if my airbag light is on after I install the new BCM?
This is a common occurrence. It means the new BCM needs to be electronically ‘introduced’ to the airbag’s computer (SDM). A mechanic with a professional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Is this a new or used part?
This is a high-quality, inspected, and tested component that has been prepared by our expert technicians. It is programmed with the latest software and is guaranteed to perform correctly.