Tired of Electrical Gremlins in Your GM Truck?
If you’re dealing with flickering lights, power windows and locks that have a mind of their own, or a security light that won’t turn off, you’re not alone. The Body Control Module (BCM) is the electronic nerve center for your truck’s body functions, and when it starts to fail, it can cause some of the most frustrating and difficult-to-diagnose problems. This isn’t just an annoyance; it can be a safety issue when your lights or security system act unpredictably. This module is the definitive, reliable solution to restore your truck’s proper function and your peace of mind.
From the Diagnostic Bay: The Case of the Haunted Silverado
I remember a 1999 Silverado 1500 that came into my shop with a laundry list of bizarre electrical issues. The owner said his interior lights would stay on, the radio would randomly shut off, and sometimes the power door locks would cycle while he was driving. He’d already replaced the battery and checked all the fuses. After connecting my scan tool, I saw multiple communication loss codes (U-codes) pointing to the BCM. The internal circuits were failing, causing data corruption on the network. We installed a VIN-programmed BCM, and it was like an exorcism for the truck—every single issue was resolved instantly. This is a classic failure pattern for these vehicles, and a new BCM is the only correct fix.
Key Signs of a Failing BCM
A faulty Body Control Module can manifest in numerous ways. If your truck is showing any of these signs, your BCM is the likely culprit. Keep an eye out for associated Diagnostic Trouble Codes (DTCs) like U-series communication codes.
- ✔ Power windows, mirrors, or door locks operating intermittently or not at all.
- ✔ Interior dome lights or exterior lights staying on or not turning on.
- ✔ The security or anti-theft light is illuminated, potentially causing a no-start condition.
- ✔ Erratic behavior from the radio or instrument cluster gauges.
- ✔ False warnings on the driver information center.
- ✔ Inconsistent horn or alarm function.
The Smart Solution: A VIN-Programmed Module
Forget expensive trips to the dealership for programming. We take care of the hard part for you. When you order, simply provide us with your vehicle’s 17-digit VIN. Our technicians will program this 1999-2000 Silverado 1500 BCM with the latest GM software updates specific to your truck. This ensures that the module communicates perfectly with your vehicle’s existing systems right out of the box, saving you hundreds in dealer fees and diagnostic time. Plus, with no core charge, you can keep your old part without the hassle of shipping it back.
A Straightforward Guide to BCM Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait about 10 minutes to ensure all systems are powered down.
- ✔ 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.
- ✔ Remove the Old Module: Carefully unplug the electrical connectors. 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 electrical connectors. 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 body functions—windows, locks, lights, radio, etc.—to confirm the repair.
Important Post-Installation Information
After installing your new 1999-2000 Silverado 1500 BCM, a couple of additional steps may be needed. These are not always required but are important to be aware of:
- Airbag System Sync: If the 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 new BCM with the airbag system.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure correct brake light and traction control operation.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a qualified technician for specific guidance.
Will This Fit My Vehicle?
This Body Control Module is a direct-fit replacement for a wide range of GM trucks and SUVs. Please verify your vehicle and part number ID (if possible) from the list below. This unit replaces part numbers including 16257125, 19153625, 8162571250, and 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
Do I need to get this BCM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide your vehicle’s VIN at checkout, and it will arrive ready to install.
What is a VIN and where do I find it?
The VIN is your vehicle’s unique 17-digit identification number. You can find it on your driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Where is the BCM located on my 1999 Silverado?
On the 1999-2000 Silverado and Sierra, the BCM is typically found under the driver’s side dashboard, to the left of the steering column.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.
What if the airbag light comes on after I install it?
This can happen occasionally. It means the new BCM needs to be electronically synced with the airbag module. This procedure, called ‘Setup SDM Primary Key in BCM’, must be done by a mechanic with a professional-grade diagnostic tool.