Programmed 2002-2005 Trailblazer BCM 15122670 | Envoy Rainier Ascender

Skip the Dealer, Fix It Right.

Stop the electrical headaches in your GM SUV. This replacement Body Control Module (BCM) comes pre-programmed to your vehicle’s VIN, eliminating the need for expensive dealership visits. It’s a direct-fit solution for flickering lights, dead batteries, and malfunctioning accessories in your Trailblazer, Envoy, and more. Restore your vehicle’s factory functions with a reliable, ready-to-install part. Order now to get your truck back on the road fast!

$224.95

+11.99 USPS Priority Shipping

Availability: In stock



SKU: 591-06811-24 Categories: ,
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Restore Your SUV’s Electrical System with a Reliable, Programmed BCM

Are you chasing down frustrating electrical gremlins in your Trailblazer, Envoy, or Rainier? Flickering lights, a radio with a mind of its own, power windows that won’t cooperate, or a battery that’s constantly dead are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can make your daily drive a nightmare. I’ve been diagnosing these GM SUVs for over 20 years, and I’ve seen firsthand how a failing BCM can cause a cascade of confusing and seemingly unrelated problems. This isn’t just a part; it’s the solution to getting your truck’s comfort and convenience features working like new again.

This is a direct-fit replacement BCM for part number 15122670 and its interchanges. The best part? We handle the complicated part for you. Simply provide your vehicle’s VIN at checkout, and we will program the module with the latest GM software specifically for your truck. This means no expensive trips to the dealership for programming. It arrives at your door ready for installation, saving you time, money, and headaches.

Case Study: A Tricky Diagnosis

A customer brought in a 2004 Envoy with a complaint that stumped two other shops: the battery would die overnight, but only sometimes. They had already replaced the battery and alternator. After connecting my scan tool, I noticed the BCM wasn’t going into ‘sleep’ mode, creating a parasitic draw. In my shop, I’ve diagnosed hundreds of these GMT360 platform BCM failures. Often, it’s not a dramatic failure but a slow degradation of internal circuits, leading to issues like this phantom battery drain. Replacing the BCM with a correctly programmed unit solved the problem for good.

Is Your GM SUV Showing These Symptoms?

  • ✔ Erratic or non-functional power windows, door locks, or mirrors.
  • ✔ Interior or exterior lights flickering, staying on, or not working at all.
  • ✔ Unexplained parasitic battery drain that kills your battery overnight.
  • ✔ The security light is on, or the vehicle won’t start intermittently.
  • ✔ Horn honking randomly or not working when pressed.
  • ✔ HVAC (heater and A/C) controls behaving unpredictably.
  • ✔ Common diagnostic trouble codes (DTCs) like U0140, B1000, or B1001 stored in the system.

Your Step-by-Step BCM Installation Guide

  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 models, the BCM is integrated with the fuse box under the rear driver’s-side seat. For the Envoy XUV, it’s located under the rear floor panel. Always confirm the location for your specific vehicle.
  3. ✔ Remove Covers: Unclip and remove any plastic covers or trim pieces necessary to access the BCM/fuse box assembly.
  4. ✔ Disconnect Connectors: Carefully unplug all the wiring harness connectors from the old BCM. They have locking tabs that need to be depressed. Take a photo beforehand if you’re worried about mixing them up.
  5. ✔ Swap the Module: Unbolt or unclip the old BCM from its mounting location and install the new, pre-programmed module in its place.
  6. ✔ Reconnect Everything: Plug all wiring harnesses back into the new BCM, ensuring each one clicks securely into place. Reinstall any covers and reconnect the negative battery terminal.
  7. ✔ Perform Post-Install Checks: Start the vehicle and test all body functions (lights, locks, windows, radio). Follow the post-installation procedures below if any warning lights appear.

Important Post-Installation Procedures

While this 2002-2005 Trailblazer BCM is programmed for your VIN, some vehicle systems may require a ‘handshake’ with the new module. This is a normal part of the process.

  • Airbag System Sync: If the airbag warning light is illuminated after installation, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. This syncs the new BCM with the airbag system.
  • Brake Pedal Position Relearn: On some models, a brake pedal position sensor relearn may be required to ensure your brake lights and traction control system function correctly.

Disclaimer: We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step. These procedures can vary slightly by exact model and year.

Verified Fitment for Your GM SUV

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

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

Do I need to send my old BCM back?

Do I need to send my old BCM back?

No, there is no core charge for this module. You can keep your original part.

Is this BCM truly plug-and-play?

Do I need to send my old BCM back?

No, there is no core charge for this module. You can keep your original part.

What information do you need to program it?

Do I need to send my old BCM back?

No, there is no core charge for this module. You can keep your original part.

Will this 2002-2005 Trailblazer BCM fix my parasitic battery drain?

Do I need to send my old BCM back?

No, there is no core charge for this module. You can keep your original part.

How do I know if my vehicle has the factory security system?

Do I need to send my old BCM back?

No, there is no core charge for this module. You can keep your original part.

Conditions & Options

Programmed to your VIN GM: 15122670

Genuine OEM

Yes

Interchange part number

Condition

Seller refurbished

Model

BRAVADA

Make

Year

2002, 2003, 2004, 2005

Brand

GM

MPN

15122670

Manufacturer Part Number

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