Restore Full Electrical Control to Your GM SUV
Are you battling a host of strange and unpredictable electrical problems in your Chevrolet Trailblazer, GMC Envoy, or other GMT360 platform vehicle? Issues like non-responsive power windows, erratic interior lights, a malfunctioning security system, or phantom warning messages on your dash are often symptoms of a failing Body Control Module (BCM). The BCM acts as the central command center for your vehicle’s body electronics, and when it fails, it can create a cascade of frustrating issues. This replacement Body Control Module is the definitive solution to restore your vehicle’s functionality and peace of mind.
This isn’t just a salvaged part from a junkyard. We provide a fully tested BCM that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless integration with your vehicle’s existing systems and options. We load the latest available software updates from GM, which can resolve factory bugs and improve performance. This plug-and-play approach eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay
We recently had a 2004 GMC Envoy in the shop with a classic BCM failure. The customer complained that the driver’s side power window, power locks, and mirror had all stopped working simultaneously. He had already replaced the master window switch to no avail. A scan tool confirmed we couldn’t communicate with the driver’s door module. On these trucks, the BCM is integrated into the under-hood fuse block, a location notoriously vulnerable to water intrusion from a degraded windshield cowl seal. Sure enough, we found tell-tale signs of corrosion on the BCM’s circuit board. Installing a VIN-programmed BCM and sealing the cowl leak brought all the dead electronics back to life instantly. It’s a common failure point we’ve seen dozens of times.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior dome lights or exterior lights staying on or not turning on at all.
- ✔ The security system light flashing or the alarm sounding randomly.
- ✔ Horn not working or honking unexpectedly.
- ✔ Inaccurate fuel gauge or other instrument cluster malfunctions.
- ✔ HVAC (heater and A/C) controls behaving erratically.
- ✔ Communication errors with other vehicle modules (DTC U-codes).
Why Choose Our Programmed Trailblazer Envoy BCM?
Getting your truck back on the road shouldn’t be a hassle. Our process is designed to be as straightforward as possible. Simply provide us with your VIN during checkout, and our technicians will handle the complex programming. Your new Trailblazer Envoy BCM will arrive ready for installation. This module is a direct replacement for a wide range of GM SUVs from 2002 to 2005, including the Chevy Trailblazer, GMC Envoy, Oldsmobile Bravada, Buick Rainier, Isuzu Ascender, and Saab 9-7X. It is compatible with multiple part numbers, including 15122670, 15065293, 15114669, 15191621, and 9352135, ensuring a perfect match for your vehicle.
Important Post-Installation Information
While this module is designed for a straightforward installation, some vehicles may require additional steps to ensure all systems are synchronized correctly. Please be aware of the following potential procedures:
- Airbag System Sync: If your airbag warning light is illuminated after installation, a procedure called ‘Setup SDM Primary Key in BCM’ must be performed. This requires a professional-grade scan tool to sync the BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary. This ensures your brake lights function correctly and that the traction control and stability systems operate as designed.
We believe in transparency and want to ensure you have all the information needed for a successful repair. By choosing our pre-programmed Trailblazer Envoy BCM, you are getting a quality part that solves the root cause of your electrical woes and restores the factory functionality you depend on every day.
Frequently Asked Questions
Do I need to have this BCM programmed by a dealer?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN when you order, and the module will arrive ready to install.
Where is the BCM located on my 2004 Trailblazer?
On most GMT360 platform vehicles like the Trailblazer and Envoy, the BCM is integrated into the main fuse block located under the hood, typically on the driver’s side.
What does the ‘Setup SDM Primary Key in BCM’ procedure involve?
This is a security handshake procedure between the new BCM and your vehicle’s original airbag control module (SDM). It requires a bidirectional scan tool with GM-specific software to complete and is only necessary if the airbag light comes on after installation.
Is there a core charge for this part?
No, there is no core charge. You can keep your original module without needing to send it back to us.
Will this part fix my power windows?
If the root cause of your power window failure is a faulty Body Control Module, then yes, this part will resolve the issue. The BCM controls the communication network for features like power windows, and its failure is a very common reason for them to stop working on these vehicles.