Restore Your Vehicle’s Electrical System with a Plug-and-Play Solution
Are you chasing down frustrating electrical gremlins in your SAAB 9-7X, Trailblazer, or Envoy? Intermittent power windows, flickering lights, or strange security system alerts are classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it fails, it can cause a cascade of confusing and unpredictable problems. Stop guessing and replace it with a component you can trust.
This isn’t just a replacement part; it’s a complete solution. We take the biggest headache out of the repair process: programming. Simply provide your vehicle’s VIN during checkout, and our technicians will program this BCM with the latest GM factory software specific to your vehicle. This means no expensive trip to the dealership for coding. It arrives at your door ready for installation, saving you time, money, and hassle.
I remember a 2004 Trailblazer that came into my bay with the strangest collection of symptoms I’d seen in a while. The customer reported the radio would turn on by itself, the driver’s side window wouldn’t go down, and the horn would randomly honk when using the turn signal. We checked grounds, wiring harnesses, and switches for hours. On a hunch, we swapped in a known-good BCM. Instantly, every single issue was resolved. The original BCM had internal corrosion from a leaky windshield seal, causing data corruption. These GMT360 platform vehicles are notorious for this, and a pre-programmed BCM is the most efficient and reliable fix.
Common Signs of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights flickering, staying on, or not turning on.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Instrument cluster warning lights (like the airbag light) illuminating for no reason.
- ✔ Diagnostic trouble codes related to communication loss with other modules (U-codes).
- ✔ Wipers or the horn activating unexpectedly.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- ✔ Locate the BCM: On most of these GM SUVs (like the Trailblazer, Envoy, and SAAB 9-7X), the BCM is located under the rear seat on the driver’s side, often integrated with the rear fuse block.
- ✔ Remove the Old Module: Carefully disconnect the electrical connectors. They have locking tabs that need to be depressed. Once unplugged, unbolt or unclip the old BCM and remove it from the vehicle.
- ✔ Install the New BCM: Seat the new, pre-programmed BCM in the same position and secure it. Reconnect all electrical connectors, ensuring they click firmly into place.
- ✔ Reconnect Power: Reattach the negative battery terminal and tighten it securely.
- ✔ Perform Final Checks: Start the vehicle and test all body functions—windows, locks, lights, wipers, etc. Note that some post-installation procedures may be required as detailed below.
Important Post-Installation Notes
While this BCM is programmed to your VIN, your vehicle’s other modules may need to relearn its presence. Depending on your specific model and circumstances, you may encounter the following:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure correct brake light and traction control operation, a brake pedal position sensor relearn may be necessary.
Disclaimer: Always consult a factory service manual or a qualified technician if you are unsure about any step. No core charge is required—you can keep your old part.
Verified Vehicle Compatibility
This Body Control Module is a direct replacement for part numbers 15191621, 15122670, 15065293, 15114669, and 9352135 and fits the following models:
- 2005 SAAB 9-7X
- 2002-2005 Chevrolet Trailblazer & Trailblazer EXT
- 2002-2005 GMC Envoy, Envoy XL, & Envoy XUV
- 2002-2004 Oldsmobile Bravada
- 2004-2005 Buick Rainier
- 2003-2005 Isuzu Ascender
Note: Please verify your specific options (e.g., with/without security system) match the fitment data provided. This module is for vehicles without the factory security system unless otherwise specified.
Frequently Asked Questions
What do I need to do after I purchase?
After you place your order, you must send us your vehicle’s 17-digit VIN. We cannot program and ship the module without it. This ensures the BCM works correctly with your vehicle’s specific options.
Is this a true plug-and-play installation?
For most vehicles, yes. Because we program it to your VIN, it eliminates the need for dealer programming. However, as noted, some models may require a simple relearn procedure for the airbag or brake pedal sensor, which may require a professional scan tool.
Will this fix my specific electrical problem?
This BCM will resolve issues directly caused by a faulty Body Control Module. Please review the list of common symptoms. If you’re unsure, it’s always best to have a qualified mechanic perform a full vehicle diagnosis first.
Why is this a better option than a part from a salvage yard?
A used BCM from a junkyard will be programmed to the donor vehicle’s VIN and options, which will cause compatibility issues with your car. Our BCMs are programmed specifically for YOUR vehicle with the newest software, ensuring proper function and reliability.
Do I need to return my old BCM?
No. There is no core charge for this part. You can keep your original module.