Restore Full Functionality to Your GM SUV
Is your Isuzu Ascender, Chevy Trailblazer, or GMC Envoy suffering from bizarre electrical problems? Flickering lights, malfunctioning power windows, a security system that acts on its own, or a battery that drains overnight are all classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it malfunctions, it can create a host of frustrating and difficult-to-diagnose issues. This replacement BCM is the definitive solution, engineered to restore your vehicle’s systems to perfect working order.
From the Diagnostic Bay
We had a 2004 Trailblazer come into the shop with a complaint that was driving the owner crazy: the battery would be dead every other morning. They had already replaced the battery and the alternator. After hooking up a multimeter to check for parasitic draw, we noticed a significant current pull even after the vehicle was off for 30 minutes. By pulling fuses one by one, we isolated the draw to circuits controlled by the BCM. The internal relays were sticking, keeping modules powered on long after the key was out. A new, properly programmed BCM like this one solved the problem completely, saving the customer from further guesswork and the cost of another new battery.
Your Plug-and-Play Isuzu Ascender BCM Solution
Don’t waste time and money at a dealership. We eliminate the most complicated part of the repair process. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program this module with the latest GM factory software specific to your vehicle. This ensures that the BCM communicates flawlessly with your vehicle’s other computers right out of the box. This is not a generic, one-size-fits-all part; it’s a component precisely prepared for your specific SUV, making installation straightforward and effective.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-working power windows, door locks, or mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or won’t turn on at all.
- ✔ Unexplained parasitic battery drain leading to a dead battery.
- ✔ Instrument cluster gauges behaving erratically or not working.
- ✔ Malfunctioning security system or horn honking randomly.
- ✔ Wipers operating incorrectly or not at all.
- ✔ Communication errors with other vehicle modules (DTC U-codes).
Installation and Post-Install Procedures
Physically replacing the BCM, typically located near the interior fuse box, is a manageable task for a DIY mechanic. Once installed, the module is ready to function. However, in some cases, additional synchronization procedures may be required. Please note the following:
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: To ensure correct brake light operation and traction control performance, a brake pedal position sensor recalibration may be needed. This can also be performed with a compatible diagnostic tool.
We’ve made this process even easier with our no core charge policy. You don’t need to send your old, faulty module back to us. Keep it, recycle it, or dispose of it as you see fit.
Guaranteed Fitment for Your Vehicle
This BCM is a direct replacement for the following part numbers:
15065293, 15122670, 15114669, 15191621, 9352135
It is confirmed to fit the following vehicles:
- 2002-2005 Chevrolet Trailblazer & Trailblazer EXT
- 2002-2005 GMC Envoy, Envoy XL & Envoy XUV
- 2003-2005 Isuzu Ascender
- 2002-2004 Oldsmobile Bravada
- 2004-2005 Buick Rainier
- 2005 Saab 9-7X
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM acts as the central computer for your vehicle’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the instrument cluster.
How do I know if my BCM is the problem?
Common signs include multiple, unrelated electrical issues happening at once, such as lights flickering while windows stop working, or a persistent battery drain that can’t be traced to a specific component. A diagnostic scan showing communication loss codes with the BCM is also a strong indicator.
What does VIN programming mean?
VIN programming means we load the module with the specific software and settings for your exact vehicle using its unique 17-digit Vehicle Identification Number (VIN). This makes the module plug-and-play and avoids a costly trip to the dealer for programming.
Is this part difficult to install?
The physical installation is generally straightforward for someone with basic mechanical skills. It’s often located in the cabin, near the fuse panel. The main benefit of our service is that the complex software programming is already done for you.
Do I need to send my old part back?
No. We do not require you to return your original module. There is no core charge associated with this purchase.
What if my airbag light is on after I install the new BCM?
This can happen occasionally. It means the new BCM needs to be electronically introduced to the airbag module (SDM). A mechanic with a high-level scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.