Are you chasing electrical gremlins in your GM truck or SUV? Intermittent wipers, flickering dash lights, power windows with a mind of their own, or a security light that won’t turn off are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s body electronics, a faulty BCM can cause a cascade of frustrating and hard-to-diagnose problems. This isn’t just an annoyance; it can affect vehicle security and safety. Stop guessing and replace the root cause of the problem with a reliable, fully programmed BCM.
This isn’t a generic, off-the-shelf part that leaves you stranded. We provide a complete solution. Before we ship, our technicians will program this BCM with the latest GM software updates, specifically matched to your vehicle using the VIN you provide. This critical step ensures that when the module arrives, it’s ready to integrate seamlessly with your truck’s existing systems, saving you a costly trip to the dealership for programming. You get a direct-fit replacement that restores original functionality, backed by years of hands-on diagnostic experience.
Case Study: A Tricky Diagnosis
I remember a 2000 Silverado 1500 that came into my shop with the owner at his wit’s end. The radio would cut out, the dome light would stay on, and the power locks worked only when they wanted to. He’d already replaced the battery and checked all the fuses. After connecting my scan tool, I noticed communication errors with multiple systems, all pointing back to a central point. The culprit was a failing BCM. The internal circuits were breaking down, sending erratic signals across the vehicle. Installing a pre-programmed 1999–2000 GM BCM like this one solved every single issue in under an hour. It’s a common failure point I’ve seen dozens of times on these otherwise rock-solid trucks.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights that stay on, flicker, or don’t work at all.
- ✔ The security or anti-theft system light stays illuminated, preventing the engine from starting.
- ✔ Wipers behaving unpredictably (e.g., won’t turn off).
- ✔ Horn sounding randomly or not working when pressed.
- ✔ Communication-related Diagnostic Trouble Codes (DTCs), often starting with ‘U’.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the BCM: On most of these models, the BCM is located under the driver’s side or center of the dashboard. It’s a black plastic box with several large wiring connectors.
- ✔ Remove the Old Module: Carefully unplug all wiring harnesses. They have locking tabs that need to be depressed. Once unplugged, unbolt the module from its mounting bracket.
- ✔ Install the New BCM: Mount your new, pre-programmed BCM in the same location and securely reconnect all the wiring harnesses. You should hear a ‘click’ as they lock into place.
- ✔ Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions: lights, locks, windows, wipers, etc.
Important Post-Installation Steps
While this 1999–2000 GM BCM is a plug-and-play solution for most functions, some vehicle systems may require a ‘handshake’ with the new module. Please be aware of the following:
- Airbag System Sync: If your airbag warning light is on after installation, a professional scan tool is needed to perform the “Setup SDM Primary Key in BCM” procedure. This syncs the airbag system with the new BCM.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration may be needed to ensure proper brake light and traction control operation.
Disclaimer: Always consult a factory service manual or a qualified technician if you are unsure about any step. Specific procedures can vary slightly by exact model and year.
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 09366801, 16257125, 19153625, 8191536250, 191583625, 8093668010, and 8162571250. It is guaranteed to fit the following vehicles:
- 1998-2000 Chevrolet S10 / GMC Sonoma
- 1998-2000 Chevrolet Blazer / GMC Jimmy
- 1998 Oldsmobile Bravada (w/ extended build date opt ZN4)
- 1999-2000 Chevrolet Silverado 1500 & 2500
- 1999-2000 GMC Sierra 1500 & 2500
- 2000 Chevrolet Astro / GMC Safari
- 1999-2000 Isuzu Hombre
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 part. You can keep your original module.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship the module until we receive this information to perform the programming service.
What if my key has a chip in it (Passlock/VATS)?
Our programming service for this 1999–2000 GM BCM typically handles the vehicle’s security information. In most cases, no additional security relearn procedure is required, making for a true plug-and-play experience.
Is this a difficult part for a DIYer to install?
For someone with basic hand tools and comfort working under a dashboard, this is a very manageable job. The main challenge is typically access. Since we handle the programming, the most complex part of the process is already done for you.
What happens if the airbag light comes on?
This can occasionally happen as the airbag module (SDM) needs to sync with the new BCM. A repair shop with a professional-grade bidirectional scan tool can perform the “Setup SDM Primary Key in BCM” function in a few minutes to resolve this.