Restore Full Electrical Function to Your GM SUV
Are you battling a frustrating array of electrical gremlins in your Chevrolet Trailblazer, GMC Envoy, or other GM SUV? Issues like malfunctioning power windows, erratic interior lights, a dead battery in the morning, or unresponsive door locks are often traced back to a single culprit: a failing Body Control Module (BCM). The BCM acts as the central command center for your vehicle’s body electronics, and when it starts to fail, it can create a cascade of seemingly unrelated problems. This pre-programmed BCM is the definitive solution to restore your vehicle’s comfort and convenience features to perfect working order.
From the Diagnostic Bay
We recently had a 2004 GMC Envoy come into the shop with a classic BCM failure. The owner was frustrated with a battery that died overnight, even after replacing it twice. Our diagnostics revealed a significant parasitic draw. The BCM wasn’t entering its ‘sleep’ mode correctly, which in turn kept several other modules on the communication network awake all night, slowly draining the battery. Swapping in a correctly programmed BCM not only solved the battery drain but also fixed a quirky issue the owner had with the rear wiper not working. It’s a perfect example of how one failing module can cause multiple, confusing symptoms.
Common Symptoms of a Failing BCM
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ Interior dome lights or exterior lamps staying on or not turning on.
- ✔ The security system or horn activating randomly.
- ✔ Instrument cluster gauges behaving erratically or warning lights appearing.
- ✔ A persistent parasitic battery drain that kills your battery overnight.
- ✔ Communication errors with other vehicle modules when scanned with a diagnostic tool.
The Plug-and-Play Solution for Your 2002-2005 Trailblazer BCM
Replacing a BCM used to mean a trip to the dealership for expensive programming and calibration. We eliminate that hassle. When you purchase this module, you simply provide us with your vehicle’s VIN. Our technicians will then flash the BCM with the latest, most stable software directly from GM, ensuring it is perfectly matched to your vehicle’s specific options and configuration. This means that when the part arrives, it’s ready for a straightforward installation. There is no core charge, so you can keep your original module.
Installation and Post-Install Considerations
Installation is typically a direct swap of the old module, which is located on the front fuse box. While our programming handles the majority of the setup, some vehicles may require one or two simple relearn procedures after the new BCM is installed:
- Airbag System Sync: In some cases, the airbag warning light may illuminate after installation. This is because the new BCM needs to be electronically ‘introduced’ to the airbag’s SDM (Sensing and Diagnostic Module). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the systems and clear the light.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control functionality, a brake pedal position sensor recalibration might be necessary. This is also performed with a compatible diagnostic tool.
Always consult a factory service manual or a qualified technician for vehicle-specific guidance.
Guaranteed Fitment
This BCM is a direct replacement for the following part numbers: 15122670, 15065293, 15114669, 15191621, and 9352135. It is designed to fit a wide range of 2002-2005 GM SUVs, including the Chevrolet Trailblazer & EXT, GMC Envoy XL & XUV, Oldsmobile Bravada, Buick Rainier, Isuzu Ascender, and Saab 9-7X. By programming to your VIN, we ensure perfect compatibility.
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 during checkout, and the module will arrive ready for installation.
Where is the BCM located on my 2003 Trailblazer?
On most compatible models like the Trailblazer, Envoy, and Bravada, the BCM is located on the front interior fuse box assembly, typically on the driver’s side of the cabin.
What if my airbag light is on after I install the new BCM?
This is a known possibility. It requires a ‘Setup SDM Primary Key in BCM’ procedure with a professional-grade scan tool to sync the new BCM with the airbag system. This will turn off the light.
Will this part fix my dead battery problem?
A failing BCM is a very common cause of parasitic battery drain in these vehicles. If the BCM is not ‘sleeping’ properly, it can keep other electronics active, draining the battery. This replacement module is a very likely fix for that specific issue.
Is there a core charge for this part?
No, there is no core charge. You are not required to send your old BCM back to us.