Restore Full Control of Your Truck’s Electronics
If you’re dealing with bizarre electrical issues in your 1999-2000 Silverado 1500, you’re not alone. Flickering lights, unresponsive power windows, or a security system that has a mind of its own are classic signs of a failing Body Control Module (BCM). As a technician with over two decades of experience, I’ve seen how a bad BCM can turn a reliable truck into a source of daily frustration. The BCM is the central hub for your truck’s body electronics, and when it goes, it takes convenience and safety features down with it. This isn’t just an annoyance; it’s a critical component failure that needs a reliable fix.
Is Your Silverado Showing These Symptoms?
- ✔ Intermittent or non-functional power windows, door locks, or mirrors.
- ✔ Erratic interior or exterior lighting (dome lights staying on, headlights flickering).
- ✔ The security system or horn activating randomly.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ “Service 4WD” or other warning messages appearing without a clear cause.
- ✔ Communication issues that may trigger diagnostic trouble codes (DTCs) like U0140 (Lost Communication With Body Control Module).
Case Study: A Tricky Diagnosis
I remember a 2000 Sierra 1500 (which uses the same BCM) that came into my shop with a ghost problem. The owner complained of the radio turning off and the dome lights flashing while driving. We checked the battery and alternator—both were fine. No obvious wiring shorts. After hooking up the scan tool, I noticed intermittent communication drops with the BCM. On these GM trucks, the BCM is the gateway for many systems. A failing internal processor was causing network-wide chaos. Replacing the BCM with a properly programmed unit solved every single issue instantly. It’s a perfect example of how one module can cause a dozen confusing symptoms.
The Simple, Dealer-Free Solution
Forget about costly dealership appointments and programming fees. We’ve streamlined the repair process for you. This 1999-2000 Silverado BCM arrives at your door programmed specifically for your truck. All we need is your vehicle’s VIN at checkout. We handle the complex part—flashing the module with the latest GM software—so you can focus on the straightforward installation. This ensures all your truck’s original features work as intended from the moment you plug it in. Plus, there is no core charge, so you can keep your old part without the hassle of sending it back.
Your Step-by-Step Installation Guide
- ✔ Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- ✔ Locate the BCM: On most 1999-2000 Silverado and Sierra models, the BCM is located on the driver’s side, up under the dashboard to the left of the steering column.
- ✔ Disconnect the Connectors: Carefully unplug the multiple wiring harnesses from the old BCM. Each connector has a locking tab that needs to be depressed or a lever that needs to be released. Do not force them.
- ✔ Remove the Old Module: Unbolt or unclip the old BCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New BCM: Mount your new, pre-programmed BCM in the same location. Reconnect all wiring harnesses, ensuring each one clicks securely into place.
- ✔ Reconnect the Battery: Reattach the negative battery terminal. Your installation is now complete. Proceed with the post-installation checks below.
Important Post-Installation Procedures
After installing your new 1999-2000 Silverado BCM, a couple of system relearns may be necessary depending on your specific vehicle. This is a normal part of the process.
- ✔ Airbag System Sync: If the airbag warning light is illuminated after installation, it means the new BCM needs to be synced with the airbag’s SDM (Sensing and Diagnostic Module). A professional scan tool is required to perform the “Setup SDM Primary Key in BCM” procedure. This is only needed if the light is on.
- ✔ Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration. This ensures your brake lights and traction control system function correctly. This procedure can often be done with a high-end diagnostic tool.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a qualified technician if you are unsure about any step.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles and part numbers. Please verify your part number or contact us with your VIN to confirm fitment.
Replaces Part Numbers: 19153625, 8191536250, 16257125, 191583625, 8093668010, 8162571250, 09366801
- ✔ ASTRO 2000 Body Control (BCM); (LH dash)
- ✔ BLAZER S10/JIMMY S15 1998-2000 Body Control (BCM); (center dash), ID 16257125
- ✔ BRAVADA 1998 Body Control (BCM); (center dash), w/extended build date (opt ZN4)
- ✔ ISUZU HOMBRE 1999-2000 Body Control (BCM); (LH dash)
- ✔ S10/S15/SONOMA 1998-2000 Body Control (BCM); (center dash), ID 16257125
- ✔ SAFARI (GMC) 2000 Body Control (BCM); (LH dash)
- ✔ SIERRA 1500 PICKUP 1999 Body Control (BCM); (LH dash)
- ✔ SIERRA 1500 PICKUP 2000 Body Control (BCM); (LH dash), ID 16257125
- ✔ SIERRA 2500 PICKUP 1999 Body Control (BCM); (LH dash)
- ✔ SIERRA 2500 PICKUP 2000 Body Control (BCM); (LH dash), ID 16257125
- ✔ SILVERADO 1500 PICKUP 1999 Body Control (BCM); (LH dash)
- ✔ SILVERADO 1500 PICKUP 2000 Body Control (BCM); (LH dash), ID 16257125
- ✔ SILVERADO 2500 PICKUP 1999 Body Control (BCM); (LH dash)
- ✔ SILVERADO 2500 PICKUP 2000 Body Control (BCM); (LH dash), ID 16257125
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the BCM with the exact software and settings for your truck’s specific options. This ensures a seamless installation and that all features, from power locks to the instrument cluster, function correctly without a trip to the dealer.
Is this a plug-and-play part?
Yes, for the most part. Because we pre-program it with your VIN, the core functions will work upon installation. However, as noted in our instructions, specific systems like the airbag or brake sensor may require a simple relearn procedure with a diagnostic tool in some cases.
Do I need to return my old BCM?
No. We do not require a core return for this part. You can keep your original module, saving you time and return shipping costs.
Where is the BCM located on my 1999 Silverado?
On the 1999-2000 Silverado and Sierra pickups, the Body Control Module is typically found under the driver’s side of the dashboard, positioned to the left of the steering column.
Will this fix my random security light issue?
A faulty BCM is a very common cause of security system malfunctions, including a randomly flashing security light or no-start conditions related to the Passlock system. Replacing the BCM often resolves these problems.