If you’re dealing with bizarre electrical gremlins in your 1998-2000 Chevy Blazer, S10, GMC Jimmy, or Sonoma, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Body Control Module (BCM) can turn a reliable truck into a source of constant frustration. This isn’t just a part; it’s the central command center for your vehicle’s body electronics—from the power windows and locks to the interior lights and security system. When it fails, chaos ensues.
We solve this problem by providing a reliable, fully tested BCM that is pre-programmed specifically for your vehicle. Simply provide us with your VIN during checkout, and we’ll flash the module with the latest GM software updates before it even leaves our facility. This means no expensive trips to the dealership for programming and no need for special scan tools. It’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence.
A Technician’s Notebook: The Case of the Haunted S10
A customer brought in his ’99 S10 with a list of complaints that sounded like something out of a ghost story. The dome light would flicker randomly, the radio would shut off, and the security light would stay on, preventing the truck from starting intermittently. He’d already replaced the battery and checked the grounds. After connecting my diagnostic tool, I found multiple ‘U’ codes, indicating a loss of communication between modules. The common link? The BCM. A failing BCM can’t properly network with other computers, causing these exact kinds of phantom issues. We swapped in a VIN-programmed module like this one, and every single problem vanished instantly. It’s a classic fix for these symptoms.
Common Signs of a Failing BCM
- ✔ Erratic or non-functional power windows, door locks, or mirrors.
- ✔ Interior dome lights or dashboard lights staying on or not working at all.
- ✔ The security or anti-theft light stays illuminated, causing no-start conditions.
- ✔ Wipers or horn activating unexpectedly or not working when commanded.
- ✔ Diagnostic trouble codes (DTCs) indicating a loss of communication (U-codes) with the BCM.
- ✔ Inconsistent operation of the keyless entry system.
Your Straightforward Installation Guide
- ✔ Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the BCM: On most 1998-2000 Blazer, Jimmy, and S10 models, the BCM is located behind the passenger side of the dashboard, often near the glove box. On Silverado/Sierra models, it’s typically on the driver’s side (LH dash). A quick search for your specific model will confirm the location.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old BCM. They have locking tabs that need to be depressed. Once disconnected, unbolt or unclip the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, pre-programmed BCM in the same location and securely plug in all the electrical connectors. Ensure they click 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, wipers, etc.—to confirm proper operation.
Important Post-Installation Notes:
While this is a plug-and-play part, some vehicles may require additional steps. If your airbag warning light comes on, a professional scan tool is needed to perform the ‘Setup SDM Primary Key in BCM’ procedure. Additionally, some models may require a Brake Pedal Position Relearn to ensure correct brake light and traction control operation. Always consult a factory service manual for vehicle-specific details.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 19153625, 8191536250, 16257125, 191583625, 8093668010, 8162571250, and 09366801. It fits the following vehicles:
- 1998-2000 Blazer S10 / Jimmy S15: Body Control (BCM); (center dash), ID 16257125
- 1998-2000 S10 / S15 / Sonoma: Body Control (BCM); (center dash), ID 16257125
- 1999-2000 Silverado / Sierra 1500 & 2500: Body Control (BCM); (LH dash)
- 2000 Astro / Safari (GMC): Body Control (BCM); (LH dash)
- 1999-2000 Isuzu Hombre: Body Control (BCM); (LH dash)
- 1998 Bravada: Body Control (BCM); (center dash), w/extended build date (opt ZN4)
Frequently Asked Questions
Do I need to program this BCM?
No. We handle all the programming for you before shipment. Just provide your vehicle’s 17-digit VIN when you order, and it will arrive ready to install.
Where is the BCM located on my 1999 Chevy Blazer?
On the 1998-2000 Blazer S10 and Jimmy S15, the BCM is typically found behind the dashboard on the passenger side, accessible by removing the glove box or lower dash panel.
What happens if I forget to provide my VIN?
We cannot ship your order without the VIN, as the programming is essential for the module to function in your vehicle. We will contact you to retrieve the VIN, which may delay your shipment.
My airbag light is on after installing the new BCM. What should I do?
This can happen occasionally. It means the new BCM needs to be synced with the airbag system’s SDM module. A professional mechanic with a compatible diagnostic tool will need to perform the ‘Setup SDM Primary Key in BCM’ procedure to resolve it.
Do I need to send my old BCM back?
No, there is absolutely no core charge for this part. You can keep your old module.