Restore Your Truck’s Electrical System with a Reliable, Programmed BCM
If you’re dealing with baffling electrical issues in your 1998 Chevy Blazer, S10, or GMC Jimmy, you’re not alone. In my 20+ years as a technician, I’ve seen firsthand how a failing Body Control Module (BCM) can cause a host of frustrating problems that seem to come and go without reason. This isn’t just an inconvenience; it can affect everything from your interior lights and power windows to your vehicle’s security system. This replacement BCM is the definitive solution, arriving at your door pre-programmed with the latest GM software specifically for your vehicle’s VIN.
From the Diagnostic Bay: The Case of the Finicky Jimmy
A customer brought in his ’98 GMC Jimmy with a classic BCM failure story. The radio would turn on and off by itself, the power locks worked intermittently, and the security light would stay on, sometimes preventing the truck from starting. He’d already replaced the battery and checked fuses, but the problems persisted. After a quick scan, we confirmed communication errors with the BCM. We installed a VIN-programmed module just like this one, and within an hour, every single one of his electrical gremlins was gone. It’s a common failure, but thankfully, it’s a straightforward fix with the right part.
Is Your Blazer Showing These BCM Failure Signs?
A faulty BCM is the central nervous system for your vehicle’s body electronics. When it fails, it can manifest in numerous ways. Here are some of the most common symptoms I’ve diagnosed that point directly to a failing 1998 Blazer BCM:
- ✔ Erratic power windows or door locks that work one minute and not the next.
- ✔ Interior dome lights or dashboard lights staying on or not turning on at all.
- ✔ The security or anti-theft system light flashing, potentially causing a no-start condition.
- ✔ Horn honking unexpectedly or not working when pressed.
- ✔ Wipers activating on their own or not responding to the switch.
- ✔ Radio and climate control display issues.
Your Straightforward BCM Installation Guide
One of the best features of this module is that it arrives ready to install, saving you a costly trip to the dealership for programming. While professional installation is always an option, many DIYers can tackle this job. The BCM is typically located behind the passenger side of the dashboard.
- Safety First: Always disconnect the negative battery terminal and wait 10-15 minutes before beginning any work on your vehicle’s electrical system.
- Locate the BCM: On most 1998 S-10 chassis vehicles, the BCM is found behind the glove box or the passenger-side kick panel. You may need to remove a few trim pieces to access it.
- 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 old module from its mounting bracket.
- Install the New BCM: Mount the new module in the same location and securely plug in all the electrical connectors. You’ll 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, wipers, and radio—to ensure proper operation.
Important Post-Installation Notes
After installing your new 1998 Blazer BCM, a couple of additional steps may be needed. If your airbag warning light is on, a technician will need to perform the ‘Setup SDM Primary Key in BCM’ procedure with a scan tool. In some cases, a ‘Brake Pedal Position Relearn’ may also be required for proper brake light and traction control function. These are standard procedures and are only needed if a related warning light appears.
Verified Fitment For These 1998 GM Models
This module is a direct replacement for several part numbers, ensuring broad compatibility. Please verify your vehicle is on this list and that your original module carries one of the compatible part numbers.
- ✔ 1998 Chevrolet Blazer S10 / GMC Jimmy S15: Body Control (BCM); (center dash), ID 16268395, 9366803, or 16264870
- ✔ 1998 Oldsmobile Bravada: Body Control (BCM); (center dash), w/o extended build date
- ✔ 1998 Isuzu Hombre: Body Control (BCM); (LH dash)
- ✔ 1998 Chevrolet S10 / GMC Sonoma: Body Control (BCM); (center dash), ID 16268395
Replaces Part Numbers: 09366803, 16264870, 16268395, 8093668030, 8162683950
Frequently Asked Questions
1998 Blazer BCM
Is this a guaranteed fix for my electrical problems?
This part corrects issues caused by a failed BCM. While a faulty BCM is a very common cause for the symptoms listed, it’s always best to have a proper diagnosis performed to rule out other potential issues like bad wiring, grounds, or switches. This is the solution for a confirmed module failure.