Is Your GM SUV Experiencing Strange Electrical Problems?
If your GMC Envoy, Chevy Trailblazer, or other compatible GM SUV is acting possessed—with flickering lights, malfunctioning power windows, a dead battery for no reason, or strange security system alerts—the culprit is often a failing Body Control Module (BCM). The BCM is the central nervous system for your vehicle’s body electronics, managing everything from interior lighting and power locks to the instrument cluster and anti-theft system. When it starts to fail, it can cause a cascade of confusing and frustrating issues.
From the Diagnostic Bay
We had a 2004 Trailblazer come in that was draining its battery overnight. The owner had already replaced the battery and alternator, but the problem persisted. A parasitic draw test showed a significant current pull even when the truck was off. After isolating circuits, we traced the draw to the BCM. It wasn’t properly putting all the vehicle’s accessory circuits to sleep. A new, properly programmed BCM solved the battery drain and, as a bonus, fixed an intermittent issue the customer had with his power windows. It’s a perfect example of how one faulty module can create multiple, seemingly unrelated symptoms.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors operating erratically or not at all.
- ✔ Interior or exterior lights staying on, flickering, or not turning on.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Instrument panel gauges behaving erratically or going dark.
- ✔ Unexplained battery drain that leaves you stranded.
- ✔ Communication errors with other vehicle modules, triggering various warning lights.
- ✔ Horn honking unexpectedly or not working when needed.
Your Plug-and-Play Solution: The 2004-2005 Envoy BCM
Don’t let a faulty module keep your reliable SUV off the road. This replacement Body Control Module is the definitive solution to restore full electrical functionality to your vehicle. We take the guesswork and high dealership costs out of the equation. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will program the module with the latest GM software specific to your vehicle’s options and configuration. This ensures a seamless installation process, getting you back on the road quickly and confidently.
This module is a direct replacement for part number 9352135 and is also compatible with part numbers 15122670, 15065293, 15114669, and 15191621. There is no core charge, so you can keep your original module without the hassle of returning it.
Installation and Post-Install Procedures
Physically installing the BCM is straightforward for a DIYer with basic tools. It’s typically located on or near the interior fuse panel. Once installed, the vehicle should start and run. However, depending on your specific model and options, a couple of additional synchronization procedures 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 is needed. This requires a professional-grade scan tool to sync the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration may be necessary. This ensures the brake lights and traction control system function as intended.
Disclaimer: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Guaranteed Fitment for a Wide Range of GM SUVs
This BCM is engineered to fit a variety of GM models from 2002 to 2005. Please verify your part number and vehicle model from the list below:
- Buick Rainier: 2004-2005 (w/o security system)
- Chevrolet Trailblazer & Trailblazer EXT: 2002-2005 (w/o security system for 03-05)
- GMC Envoy, Envoy XL, & Envoy XUV: 2002-2005 (w/o security system for 03-05)
- Isuzu Ascender: 2003-2005 (w/o security system)
- Oldsmobile Bravada: 2002-2004 (w/o security system for 03-04)
- Saab 9-7X: 2005
Frequently Asked Questions
What does a Body Control Module (BCM) do on my Envoy XUV?
The BCM acts as the central computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, interior/exterior lights, the security system, wipers, and instrument cluster warnings.
Is this a plug-and-play part?
Yes, this BCM is sold as a plug-and-play solution. We program it to your vehicle’s VIN before shipping, so it’s ready for installation. In some cases, minor post-installation procedures like an airbag system sync may be needed, which requires a professional scan tool.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add this in the notes section at checkout or reply to your order confirmation email. We cannot ship the module until we receive your VIN.
Do I need to send my old BCM back?
No. This product comes with no core charge. You can keep your original module without any additional fees or hassle.
What happens if my airbag light is on after I install this?
This is a known possibility. It means the new BCM needs to be electronically introduced to the airbag module (SDM). A technician with a high-level diagnostic tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.