Is Your GM SUV Experiencing Strange Electrical Issues?
The Body Control Module, or BCM, is the central command center for your vehicle’s body electronics. In GM SUVs like the Chevrolet Trailblazer, GMC Envoy, and Oldsmobile Bravada, it manages a wide array of functions that you use every day. When the BCM begins to fail, it can lead to a host of confusing and frustrating problems that can seem unrelated. From flickering lights to non-responsive power windows, a faulty BCM can make your vehicle feel unreliable and difficult to operate.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security system light flashing, or the vehicle failing to start due to a security fault.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Wipers operating intermittently or not parking in the correct position.
- ✔ Communication errors with a diagnostic scan tool.
- ✔ Inconsistent operation of the radio or climate controls.
The Direct-Fit, Programmed Solution for Your SUV
Don’t let a faulty module keep you off the road. This replacement Body Control Module is the definitive solution for your 2002-2005 GM SUV. The biggest hurdle in replacing a BCM is the need for expensive, dealer-specific programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, you will receive a module that is fully programmed with the latest GM software updates specific to your vehicle’s configuration. This makes the installation process as straightforward as possible, getting you back to a fully functional vehicle without the hassle and expense of a trip to the dealership.
Installation and Post-Install Considerations
While this module is designed for a direct-fit installation, some vehicles may require minor post-installation procedures to ensure all systems communicate correctly. These are simple relearn procedures that can often be completed with a high-end diagnostic scan tool.
- Airbag System Sync: In some cases, the new BCM may need to be synchronized with the vehicle’s airbag system (SDM). If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure will be required to clear the light.
- Brake Pedal Position Relearn: To ensure proper function of the brake lights and traction control system, a brake pedal position sensor recalibration may be necessary on certain models.
Please note: Specific procedures can vary by vehicle. Always consult a factory service manual or a qualified technician for guidance.
Guaranteed Compatibility
This module is a direct replacement for a range of part numbers, ensuring wide compatibility across the GM SUV platform. It is compatible with the following part numbers:
15122670, 15065293, 15114669, 15191621, 9352135
This is a reliable replacement for your original Trailblazer Envoy BCM, built to restore the performance and functionality you expect from your vehicle.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to program the BCM with the exact software and settings for your specific model, year, and options. This ensures all features work correctly and makes the installation plug-and-play, avoiding a costly trip to the dealership.
Is this part difficult to install?
The physical installation is typically straightforward. The BCM is located on the front fuse box. Basic hand tools are all that’s required to swap the module. However, as noted, some vehicles may require post-installation electronic relearn procedures with a capable scan tool.
Will this fix my ‘Service 4WD’ light?
While the BCM communicates with many systems, a ‘Service 4WD’ light is more commonly caused by the Transfer Case Control Module (TCCM), the front axle actuator, or the selector switch. It is important to properly diagnose the issue before ordering parts.
What happens if the airbag light comes on after I install it?
If the airbag light is on after installation, it means the BCM needs to be synced with the airbag module (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure, which can be performed by a repair shop with a professional-grade diagnostic tool.
Do I need to send my old BCM back?
No. There is no core charge for this part. You can keep your original module.