Restore Full Electrical Function to Your SUV
Are you battling frustrating and unpredictable electrical issues in your Isuzu Ascender, Chevy Trailblazer, or GMC Envoy? Flickering lights, malfunctioning power windows, a dead instrument cluster, or a no-start condition can often be traced back to a single point of failure: the Body Control Module (BCM). This module acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can create a cascade of problems that are difficult to diagnose. This replacement Body Control Module, part number 8258023120, is the definitive solution to restore your vehicle’s performance and reliability.
The Critical Role of Your 2005-2008 Isuzu Ascender BCM
The BCM is a vital computer that manages a wide array of non-engine-related functions. It interprets inputs from switches (like your power window or headlight switch) and sensors, then sends commands to operate various accessories. When your BCM begins to fail, communication breaks down, leading to the erratic behavior you’re experiencing. Our VIN-programmed BCM is designed to seamlessly replace your original unit, correcting these communication errors and bringing your vehicle’s features back to life.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Headlights, taillights, or interior lights staying on or not turning on at all.
- ✔ The security or anti-theft system preventing the vehicle from starting.
- ✔ Erratic or inoperative instrument cluster gauges and warning lights.
- ✔ Wipers operating incorrectly or not parking in the correct position.
- ✔ Horn not working or sounding randomly.
- ✔ False warning messages on the driver information center.
A True Plug-and-Play Solution
The biggest hurdle in replacing a modern vehicle computer is the need for expensive programming at a dealership. We eliminate that step entirely. When you purchase this module, you simply provide us with your vehicle’s VIN. Our technicians will then program the BCM with the latest GM software specific to your vehicle’s configuration. This ensures that when the part arrives, it’s ready for installation without the need for additional dealer visits or specialized tools. Plus, there is no core charge, so you can keep your old module.
Installation and Post-Install Procedures
Installation is straightforward for a DIY mechanic with some experience. The BCM is typically located on or near the front interior fuse box. After the new module is installed, there are a couple of potential procedures that may be required:
- Airbag System Sync: In some cases, the new BCM may cause the airbag warning light to illuminate. This is because it needs to be synchronized with the vehicle’s Sensing and Diagnostic Module (SDM). A professional scan tool is required to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve this.
- Brake Pedal Position Relearn: To ensure proper brake light and traction control operation, a brake pedal position sensor recalibration might be necessary. This can also be performed with a compatible diagnostic tool.
Always consult a factory service manual or a qualified technician for detailed instructions specific to your vehicle.
Guaranteed Fitment for Your Vehicle
This Body Control Module is a direct replacement for a wide range of GM SUVs built on the GMT360 platform. It is compatible with the following part numbers: 25802312, 8258023120, 15135466, and 15787809. Please verify your part number and check the fitment list below to ensure compatibility.
- Buick Rainier: 2005-2007 (w/o security system)
- Chevrolet Trailblazer: 2005-2009 (w/o security system)
- Chevrolet Trailblazer EXT: 2005-2006 (w/o security system)
- GMC Envoy: 2005-2009 (w/o security system)
- GMC Envoy XL: 2005-2006 (w/o security system)
- Isuzu Ascender: 2005-2008
- Saab 9-7x: 2006-2009
Frequently Asked Questions
Do I need to have this BCM programmed?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready to be installed.
Where is the BCM located on my 2007 GMC Envoy?
On most GMT360 platform vehicles like the Envoy, Trailblazer, and Ascender, the BCM is integrated with or located next to the interior fuse panel, typically under the driver’s side rear seat or on the driver’s side of the center console.
What if the airbag light is on after I install the new BCM?
If the airbag light comes on, it means the BCM needs to be synced with the airbag system’s computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure, which must be performed by a shop with a professional-grade diagnostic tool.
Is this a new or used part?
This is a high-quality, tested replacement part that has been programmed with the latest vehicle-specific software to ensure optimal performance and longevity.
Do I need to send my old BCM back?
No, there is no core charge for this module. You can keep your original part.