Programmed 2002-2005 Trailblazer EXT BCM 15122670

End Your SUV’s Electrical Gremlins

Tired of unpredictable power windows, lights, and locks in your Trailblazer or Envoy? This Body Control Module (BCM) is the permanent fix. It arrives fully programmed to your vehicle’s VIN with the latest GM software, eliminating the need for a costly dealer visit. Restore full functionality and reliability to your vehicle’s electronics with this easy-to-install solution. Order now and get your SUV back to normal!

$224.95

+11.99 USPS Priority Shipping

Availability: In stock



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Restore Control and End Electrical Frustrations in Your GM SUV

Are you dealing with baffling electrical issues in your Trailblazer, Envoy, or other GM SUV? Power windows with a mind of their own, dashboard lights flickering randomly, or a security system that prevents you from starting your vehicle? These aren’t just annoyances; they’re classic signs of a failing Body Control Module (BCM). The BCM is the central hub for your vehicle’s body electronics, and when it malfunctions, it can create a cascade of unpredictable problems. This replacement BCM is the definitive, reliable solution to get your truck’s features working correctly again.

We take the guesswork and high costs out of the repair. Unlike a generic part that requires an expensive trip to the dealership for programming, this module arrives at your door ready for installation. We flash it with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This ensures perfect communication between modules and restores factory-level performance and reliability for your 2002-2005 Trailblazer EXT BCM and other compatible models.

From the Diagnostic Bay: The Case of the Phantom Battery Drain

A customer brought in their 2004 Envoy, frustrated with a battery that would be dead every morning. They had already replaced the battery and the alternator, but the problem persisted. After hooking up my multimeter to check for a parasitic draw, I saw a significant amperage pull even with the key off. By pulling fuses one by one, I traced the draw to the BCM circuit. The internal circuits of the original BCM had failed, causing it to keep certain systems, like the interior courtesy lights, partially active overnight. Installing a VIN-programmed BCM didn’t just fix the drain; it also solved other minor issues the owner had learned to live with, like an intermittently working rear wiper. It’s a perfect example of how a single module failure can cause a host of seemingly unrelated problems.

Is Your SUV Showing These Symptoms?

  • ✔ Power windows, door locks, or mirrors operating erratically or not at all.
  • ✔ Interior or exterior lights staying on, flickering, or failing to turn on.
  • ✔ The security or anti-theft light is illuminated, causing a no-start condition.
  • ✔ Gauges on the instrument cluster behaving erratically or sweeping randomly.
  • ✔ Communication error codes, often in the Uxxxx range (e.g., U0140), indicating a loss of communication with the BCM.
  • ✔ Remote keyless entry (RKE) system is unresponsive.

A Straightforward Guide to Your BCM Installation

Replacing the BCM is a manageable job for a DIYer with basic tools. This guide provides a general overview for your 2002-2005 Trailblazer EXT BCM replacement. Always consult a service manual for model-specific details.

  1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
  2. Locate the BCM: On most of these GM SUVs, the BCM is integrated with the fuse box located under the rear driver’s-side seat. You may need to lift the seat cushion to access it.
  3. Disconnect Connectors: Carefully unplug all the electrical harness connectors from the old BCM. They have locking tabs that need to be depressed to be released. Do not force them.
  4. Remove the Old Module: Unbolt or unclip the old BCM/fuse box assembly from its mounting location.
  5. Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the electrical connectors.
  6. Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all body functions—windows, locks, lights, wipers, etc.—to confirm the repair.

Post-Installation Notes

While our VIN programming handles the primary setup, some vehicles may require a simple relearn procedure for specific systems to sync with the new BCM. This is normal. You might encounter a need for an Airbag System Sync if the airbag light is on, or a Brake Pedal Position Relearn. These procedures typically require a bi-directional scan tool and can be performed by any competent repair shop if needed.

Guaranteed Fitment for Your GM SUV

This module is a direct replacement for part numbers 15122670, 15065293, 15114669, 15191621, and 9352135 and is confirmed to fit the following vehicles (without factory security system unless noted):

  • Chevrolet Trailblazer & Trailblazer EXT: 2002, 2003, 2004, 2005
  • GMC Envoy, Envoy XL & Envoy XUV: 2002, 2003, 2004, 2005
  • Oldsmobile Bravada: 2002, 2003, 2004
  • Buick Rainier: 2004, 2005
  • Isuzu Ascender: 2003, 2004, 2005
  • Saab 9-7X: 2005

Best of all, there is no core charge. You can keep your old module, saving you the time and hassle of a core return.

Frequently Asked Questions

How does the VIN programming work?

After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. We use this to load the exact, most current GM-approved software for your specific vehicle onto the BCM before we ship it. This makes installation much simpler.

Do I need to return my old BCM?

No. This BCM is sold without any core charge. You can keep your original part, which means no extra deposits and no return shipping to worry about.

Is this something I can install myself?

Yes, for many DIY enthusiasts, this is a very manageable repair. The BCM is typically located under the rear seat and involves swapping electrical connectors. However, be aware that some vehicles may require a post-installation relearn procedure with a professional scan tool.

What if my airbag light comes on after installation?

This can happen occasionally. It means the new BCM needs to be synced with the airbag’s Supplemental Deployment Module (SDM). A procedure called ‘Setup SDM Primary Key in BCM’ can be performed by a technician with a capable scan tool to resolve this.

Will this fix my specific electrical problem?

This BCM corrects faults originating within the module itself. If you’re experiencing common symptoms like erratic power windows, locks, lighting, or security system issues, a faulty BCM is the most likely cause. Proper vehicle diagnosis is always recommended.

Conditions & Options

Programmed to your VIN GM: 15122670

Year
Genuine OEM

Yes

Interchange part number

Condition

Seller refurbished

Model

TRAILBLAZER EXT

Make

Year

2002, 2003, 2004, 2005

Brand

GM

MPN

15122670

Manufacturer Part Number

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