Programmed 2005-2007 Rainier BCM 25802312 Body Control Module

Are you chasing electrical gremlins in your Buick Rainier, Chevy Trailblazer, or GMC Envoy? It’s a frustrating experience I’ve seen hundreds of times in my shop: the dome light has a mind of its own, the power windows work one minute and not the next, or the dashboard lights up with random warnings. These aren’t separate problems; they often point to a single failing component: the Body Control Module (BCM).

The BCM is the central nervous system for your vehicle’s comfort and convenience features. It manages everything from your interior and exterior lighting to your power locks, windows, and security system interface. When it starts to fail, it can create a cascade of bizarre, seemingly unrelated issues. This isn’t just an annoyance; a faulty BCM can affect vehicle security and even prevent it from starting.

We offer a dependable and straightforward solution. This is a direct-fit replacement Body Control Module, part number 25802312, which also replaces part numbers 8258023120, 15135466, and 15787809. The best part? We take the biggest headache out of the equation. Simply provide your vehicle’s VIN at checkout, and our technicians will program the module with the latest GM software specifically for your vehicle. It arrives at your door ready to install, saving you a costly trip to the dealership for programming.

Is Your GM SUV Showing These Symptoms?

A failing BCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution for your 2005-2007 Rainier BCM issues and related models.

• ✔ Erratic or non-functional power windows, door locks, or mirrors.
• ✔ Interior dome lights or exterior lights staying on or not working at all.
• ✔ The security or anti-theft light flashing, potentially causing a no-start condition.
• ✔ Inconsistent or failed operation of the horn or windshield wipers.
• ✔ False warnings on the instrument cluster (e.g., “Door Ajar”).
• ✔ Communication DTCs (Diagnostic Trouble Codes) like U0140, U0155, or other U-codes stored in various modules.
• ✔ Intermittent electrical functions that seem to have no logical cause.

A Straightforward Guide to Installation

Installing your new BCM is a manageable job for a DIY enthusiast. Since we program it beforehand, you skip the most difficult step. Always follow proper safety procedures.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the system capacitors to discharge.
2. Locate the BCM: On most of these GM SUVs, the BCM is part of the front fuse box assembly, typically located under the rear seat on the driver’s side. Consult your service manual to confirm the exact location for your model.
3. Access the Module: You may need to remove trim pieces or lift the rear seat cushion to get clear access to the fuse box/BCM assembly.
4. Disconnect and Remove: Carefully unplug all the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the old module from its mounting location.
5. Install the New BCM: Mount the new, pre-programmed BCM in place and securely reconnect all electrical connectors. Ensure they click into place.
6. Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: windows, locks, lights, wipers, etc.
7. Perform Relearns (If Needed): As noted in our post-installation procedures, you may need a scan tool to perform an Airbag System Sync or a Brake Pedal Position Relearn if related warning lights appear.

Verified Vehicle Compatibility

This module is a guaranteed fit for the following vehicles, provided the original part number matches. Please verify your part number or consult the fitment list below before ordering.