Restore Full Electrical Function to Your GM SUV
Are you battling a frustrating array of electrical problems in your Trailblazer, Envoy, or other GM SUV? Flickering lights, malfunctioning power windows, erratic door locks, and a persistent battery drain are common 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 create a cascade of seemingly unrelated issues. This replacement Body Control Module is the definitive solution to restore your vehicle’s systems to perfect working order.
From the Diagnostic Bay
We had a 2004 GMC Envoy in the shop that was a true head-scratcher. The customer complained of a dead battery every few days and power locks that worked whenever they felt like it. We tested the battery and alternator—both were fine. After hours of tracing circuits, we found a parasitic draw originating from the BCM. It wasn’t properly going to ‘sleep’ when the truck was off, keeping other modules awake and slowly draining the battery. Installing a correctly programmed BCM didn’t just fix the battery drain; it also resolved the lock issue and even a dome light problem the owner had forgotten to mention. It highlights how a single faulty module can wreak widespread havoc.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ A persistent parasitic battery drain that kills your battery overnight.
- ✔ Instrument cluster gauges behaving erratically or warning lights appearing for no reason.
- ✔ Problems with the vehicle’s security system or remote keyless entry.
- ✔ Wipers or radio turning on or off by themselves.
The Plug-and-Play Advantage: Why Our Trailblazer Body Control Module is a Better Solution
Simply buying a used BCM from a junkyard won’t work. These modules are vehicle-specific and must be programmed with your vehicle’s unique VIN and factory options. Our service eliminates the most difficult part of the repair. We take a high-quality, tested module and flash it with the latest official GM software specifically for your vehicle. All you need to do is provide us with your VIN during checkout. This means you receive a part that is ready for installation right out of the box, saving you from an expensive trip to the dealership for programming.
Installation and Post-Install Considerations
While the physical installation is straightforward, some electronic systems may require a ‘handshake’ with the new BCM. Please be aware of the following potential procedures that may be necessary after installation:
- Airbag System Sync: If the airbag warning light is illuminated after installing the new BCM, a ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM) and must be performed with a professional-grade scan tool.
- Brake Pedal Position Relearn: In some cases, a brake pedal position sensor recalibration might be needed to ensure accurate brake light operation and proper function of the traction control system.
Note: Specific requirements can vary. Always consult a factory service manual or a qualified technician for guidance.
Guaranteed Fitment for Part Number 15122670
This module is a direct replacement for the following part numbers: 15122670, 15065293, 15114669, 15191621, and 9352135. It fits a wide range of GM vehicles, including:
- Chevrolet Trailblazer & Trailblazer EXT (2002-2005)
- GMC Envoy, Envoy XL, & Envoy XUV (2002-2005)
- Oldsmobile Bravada (2002-2004)
- Buick Rainier (2004-2005)
- Isuzu Ascender (2003-2005)
- Saab 9-7X (2005)
Please verify your vehicle’s options (e.g., with or without security system) to ensure a perfect match.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the exact software and vehicle-specific options (like power seats, sunroof, security system, etc.) that your vehicle was built with. This ensures the module works correctly right out of the box.
Is this part truly plug-and-play?
For the vast majority of vehicles, yes. We handle the critical programming before we ship it. However, as noted, some vehicles may require a simple relearn procedure for the airbag or brake pedal position sensor, which can be done with a capable scan tool.
What tools are needed for the post-installation procedures?
The Airbag System Sync and Brake Pedal Position Relearn procedures require a professional-grade bidirectional scan tool (such as a Tech 2, Snap-on, or Autel high-end model). Basic OBD-II code readers cannot perform these functions.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module.
Will this BCM fix my specific electrical problem?
This module will correct issues directly caused by a faulty BCM. While the symptoms listed are very common for BCM failure, we always recommend a proper diagnosis by a qualified technician to confirm the BCM is the root cause before ordering.