Restore Your Truck’s Electrical System with a Reliable BCM
If you’re dealing with baffling electrical issues in your 1998 GM truck—like power windows with a mind of their own, intermittent wipers, or a security light that won’t turn off—you’re not alone. After more than two decades in the garage, I’ve seen countless S10s, Blazers, and Hombres with these exact symptoms. The culprit is almost always a failing Body Control Module (BCM). This isn’t just an annoyance; it’s a breakdown in your vehicle’s central nervous system. This replacement BCM is the definitive solution, arriving pre-programmed to your truck’s VIN for a straightforward and effective repair.
A Technician’s Notebook: The Ghost in the Machine
I remember a 1998 Chevy S10 that came into the shop with a list of complaints that sounded like a haunting. The dome light would flicker, the radio would cut out on bumpy roads, and the door locks would cycle randomly. The owner had already replaced the battery and checked the fuses. After connecting my diagnostic scanner, I saw no communication codes, which can be misleading. The real test was monitoring the BCM data stream. I saw erratic voltage readings and input signals that didn’t match what was happening. This confirmed the internal logic of the BCM was failing. We installed a VIN-programmed module just like this one, and every single electrical gremlin vanished. It’s a classic failure, and this is the direct fix.
Common Signs of a Failing BCM
A faulty BCM can cause a wide range of frustrating problems. If your vehicle is experiencing any of the following, it’s a strong indicator that your Body Control Module needs replacement:
- ✔ Erratic or non-functional power windows, door locks, and mirrors.
- ✔ Interior or exterior lights staying on or not working at all.
- ✔ The security or anti-theft system engaging randomly or preventing the engine from starting.
- ✔ Wipers operating intermittently or at incorrect speeds.
- ✔ The horn sounding unexpectedly.
- ✔ False warnings on the instrument cluster, like a ‘door ajar’ light that won’t go off.
A Straightforward Guide to BCM Installation
Replacing the BCM in these trucks is a job most DIYers can handle. Our pre-programming service saves you a costly trip to the dealership. Follow these general steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most S10/Blazer/Jimmy models, the BCM is located in the center dash area, often near the radio or glove box. On the Isuzu Hombre, it’s typically found on the driver’s side (LH) of the dash.
- Remove Trim Panels: Carefully remove any dash panels or trim necessary to access the module. Keep track of all screws and clips.
- Disconnect and Remove: 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 Module: Mount your new, pre-programmed BCM in the same location and reconnect all electrical harnesses. Ensure they click securely into place.
- Reconnect and Test: Reconnect the negative battery terminal. Turn the key to the ‘On’ position and test all functions controlled by the BCM—windows, locks, lights, wipers, etc.
Important Post-Installation Information
While this module is programmed for your VIN, some vehicle systems may require a ‘handshake’ with the new BCM. Please be aware of the following potential procedures:
- Airbag System Sync: If your airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is necessary. This requires a professional-grade scan tool to sync the airbag module with the new BCM and clear the light.
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be needed to ensure correct brake light operation. This can often be done with a capable bidirectional scan tool.
Disclaimer: Vehicle systems can vary. We always recommend consulting a factory service manual or a certified technician if you are unsure about any step.
Verified Vehicle Compatibility
This module is a direct replacement for several part numbers and is guaranteed to fit the following 1998 models:
- ✔ 1998 Chevrolet Blazer S10 (Body Control Module located in center dash, ID 16268395, 9366803, or 16264870)
- ✔ 1998 GMC Jimmy S15 (Body Control Module located in center dash, ID 16268395, 9366803, or 16264870)
- ✔ 1998 Oldsmobile Bravada (Body Control Module located in center dash, w/o extended build date)
- ✔ 1998 Isuzu Hombre (Body Control Module located in LH dash)
- ✔ 1998 Chevrolet S10 / GMC Sonoma (Body Control Module located in center dash, ID 16268395)
This part replaces the following part numbers: 09366803, 16264870, 16268395, 8093668030, 8162683950.
Frequently Asked Questions
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the BCM with the correct software and vehicle-specific options from GM. This ensures the module communicates properly with your truck’s other systems, making installation a plug-and-play process without needing a dealer visit.
Do I need to return my old BCM?
No, there is no core charge for this part. You can keep your original module.
What tools are needed for the post-installation procedures?
If required, the Airbag System Sync and Brake Pedal Position Relearn procedures need a professional-level bidirectional scan tool. Many local repair shops have this equipment if you are unable to perform the procedure yourself.
Is a failing BCM dangerous?
While many symptoms are just annoyances, some can be safety concerns. For example, if your brake lights or exterior lights fail to operate correctly, it poses a risk on the road. Replacing a faulty BCM restores proper function and peace of mind.
How do I find the part number on my old BCM?
The part number is printed on a sticker on the BCM’s housing. You will need to access the module to see it, but this unit is a confirmed fit for all the part numbers and vehicles listed in our compatibility chart.