Restore Full Electrical Function to Your GM SUV
Is your Chevy Trailblazer, GMC Envoy, or other GM SUV experiencing a host of bizarre electrical issues? From flickering lights and erratic power locks to a non-responsive instrument cluster, these are classic signs of a failing Body Control Module (BCM). The BCM acts as the central command center for your vehicle’s body electronics, and when it malfunctions, it can make your vehicle frustrating and unreliable. This replacement BCM, part number 15122670, is the definitive solution to restore your vehicle’s electrical systems to factory-perfect condition.
Unlike sourcing a used module from a junkyard that would require expensive dealership programming, our BCM comes as a complete, ready-to-install solution. We take your vehicle’s unique Vehicle Identification Number (VIN) and program the module with the latest GM software updates specifically for your truck’s options. This critical step ensures seamless integration and proper function of all systems, saving you hundreds of dollars and the headache of a trip to the dealer.
From the Diagnostic Bay
We recently had a 2004 GMC Envoy XL in the shop with a laundry list of complaints. The customer reported the radio would randomly change stations, the power windows would work one minute and not the next, and the security light was always on. They had already replaced the battery and checked every fuse with no luck. A quick scan with a professional tool revealed multiple communication loss codes with the BCM. This is a textbook failure on these GMT360 platform vehicles. We installed a VIN-programmed BCM, and instantly, all the electrical gremlins were gone. This module is the key to solving those frustrating, seemingly unrelated issues.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security system engaging randomly or preventing the vehicle from starting.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Instrument cluster gauges behaving erratically or going dead.
- ✔ Communication errors with other vehicle modules, triggering various warning lights.
- ✔ Wipers operating intermittently or not parking in the correct position.
Guaranteed Fitment for Your Trailblazer Envoy BCM
This module is a direct replacement for a wide range of 2002-2005 GM SUVs. It is compatible with part numbers 15122670, 15065293, 15114669, 15191621, and 9352135. It fits models including the Chevy Trailblazer & Trailblazer EXT, GMC Envoy, Envoy XL & XUV, Oldsmobile Bravada, Buick Rainier, Isuzu Ascender, and Saab 9-7X. Please verify your part number and check the detailed fitment list to ensure compatibility.
Post-Installation Procedures
While our VIN programming makes this a near plug-and-play installation, some vehicles may require additional steps to sync all systems perfectly. These are simple procedures for any qualified technician with a professional scan tool.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed. This syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure the brake lights and traction control system function correctly.
Frequently Asked Questions
Do I need to have 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 shipping it. This makes the installation process much simpler and saves you the cost and time of a dealership visit.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship the module until we have your VIN.
Where is the BCM located on my Trailblazer or Envoy?
On most of these GMT360 platform vehicles, the BCM is integrated into the front fuse box assembly, typically located under the rear seat on the driver’s side. Always consult a service manual for the exact location and replacement procedure for your specific model.
What if the airbag light comes on after I install it?
This is a known possibility. It simply means the new BCM needs to be electronically ‘introduced’ to the airbag module (SDM). A technician with a bi-directional scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
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.