Tired of Your SUV’s Electrical Gremlins?
Is your Buick Rainier, Trailblazer, or Envoy acting like it’s possessed? Flickering lights, power windows with a mind of their own, strange warning messages on the dash, or even a vehicle that refuses to start can all point to one culprit: a failing Body Control Module (BCM). These issues are not just annoying; they can compromise your vehicle’s safety and reliability. Stop chasing down phantom electrical problems and get the definitive solution that restores your truck’s functionality and your peace of mind.
Common Symptoms & Your Solution
A faulty BCM can cause a cascade of frustrating issues. If you’re experiencing any of the following, this pre-programmed module is the fix you need:
- Intermittent or non-functional power windows, door locks, and mirrors.
- Interior or exterior lights that stay on, flicker, or don’t work at all.
- Erratic instrument cluster behavior or false warning lights (e.g., security light).
- Problems with the radio or climate control systems.
- A no-start condition where the engine cranks but won’t fire up due to security system confusion.
This replacement BCM is meticulously tested and programmed specifically to your vehicle’s VIN. This means it arrives ready for a straightforward installation, eliminating the need for an expensive trip to the dealership for programming. It’s the most efficient way to get your 2004-2005 Buick Rainier BCM replaced and your vehicle back to 100%.
Features & Benefits
- ✔ Ready to Install, No Dealer Needed: We program the module to your vehicle’s unique VIN before shipping. This plug-and-play solution saves you time, money, and the hassle of coordinating with a dealership.
- ✔ Restores Full Functionality: Put an end to bizarre electrical behavior. This BCM is the central command for your vehicle’s body electronics, and a new unit will restore proper operation of windows, locks, lights, and more.
- ✔ Updated GM Software: Your module is flashed with the latest stable software updates from GM, ensuring optimal performance and reliability that may exceed the original.
- ✔ No Core Charge: Forget the hassle of returning your old part. There is no core charge, making the process simpler and more convenient for you.
- ✔ Direct-Fit Compatibility: This unit is a direct replacement for multiple part numbers, including 15122670, 15065293, 15114669, 15191621, and 9352135.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
Expert Insight: The GMT360 Platform BCM
As a technician who has worked on countless Trailblazers, Envoys, and Rainiers, I can tell you that BCM failure is a common issue as these vehicles age. The module is located under the rear seat, integrated with the fuse panel, where it can be susceptible to moisture intrusion from window seal leaks or spills. Heat cycles over 20+ years also degrade internal electronic components. Many owners try a used BCM from a salvage yard, only to find it won’t work without being programmed by a dealer—a service many dealerships are reluctant to perform on used parts. Our pre-programmed 2004-2005 Buick Rainier BCM bypasses this entire problem, providing a reliable, cost-effective repair that a confident DIYer can perform in their own garage.
Post-Installation Procedures
While this BCM is programmed for a plug-and-play installation, some vehicle systems may require a recalibration procedure after the module is installed. Please be aware of the following:
- Airbag System Sync: If the airbag warning light is illuminated 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 module.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be necessary to ensure proper brake light operation and to prevent issues with the traction control system.
Guaranteed Fitment
This computer will fit the following part numbers: 15122670 15065293 15114669 15191621 9352135
ISUZU ASCENDER 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
BRAVADA 03-04 Body Control (BCM); front (fuse box side), w/o security system
ENVOY XL 02 Body Control (BCM); front (fuse box side)
ENVOY 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
ISUZU ASCENDER 03-04 Body Control (BCM); front (fuse box side), w/o security system
BRAVADA 02 Body Control (BCM); front (fuse box side)
ENVOY XL 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
ENVOY 03-04 Body Control (BCM); front (fuse box side), w/o security system
ENVOY XL 03-04 Body Control (BCM); front (fuse box side), w/o security system
TRAILBLAZER 02 Body Control (BCM); front (fuse box side)
RAINIER 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
TRAILBLAZER EXT 02 Body Control (BCM); front (fuse box side)
ENVOY 02 Body Control (BCM); front (fuse box side)
TRAILBLAZER 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
TRAILBLAZER EXT 05 Body Control (BCM); front (fuse box side), w/o security system; ID 15122670
TRAILBLAZER EXT 03-04 Body Control (BCM); front (fuse box side), w/o security system
ENVOY XUV 04-05 Body Control (BCM); front (rear floor panel), w/o security system
RAINIER 04 Body Control (BCM); front (fuse box side), w/o security system
SAAB 9-7X 05 Body Control (BCM); (fuse box front)
Choosing the right part is crucial. This 2004-2005 Buick Rainier BCM is your best bet for a lasting repair.
Frequently Asked Questions
Do I need to program this BCM?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN at checkout, and the module will arrive ready for installation.
Where is the BCM located on my Rainier or Trailblazer?
The Body Control Module on most GMT360 platform vehicles (Rainier, Trailblazer, Envoy, etc.) is integrated into the fuse box located under the rear driver’s side passenger seat. You will need to lift the seat bottom to access it.
What’s the difference between a BCM and an ECU/ECM?
The BCM (Body Control Module) manages the vehicle’s body electronics, such as lights, windows, locks, and the security system. The ECU/ECM (Engine Control Unit/Module) manages the engine’s performance, fuel, and emissions systems. They are two separate computers with distinct functions.
Why is my airbag light on after installing the new BCM?
The airbag system (SDM) is a critical safety component that is paired with the BCM. If the light is on, it means the modules need to be electronically re-synced. This requires a professional scan tool to perform the ‘Setup SDM Primary Key in BCM’ procedure. It’s a quick process for a qualified technician.
What information do you need from me to program the module?
All we need is your vehicle’s 17-digit Vehicle Identification Number (VIN). You can typically find this on your driver’s side door jamb sticker, your insurance card, or on the dashboard visible through the windshield.