Restore Control Over Your GM Truck’s Electronics
Are you battling bizarre electrical problems in your 2001 Chevy Blazer, GMC Jimmy, or another compatible GM truck? Flickering lights, intermittent power windows, or a security system that has a mind of its own are classic signs of a failing Body Control Module (BCM). As the central hub for your vehicle’s comfort and convenience features, a faulty BCM can make driving a daily frustration. This replacement BCM, part number 9371990, is the reliable, straightforward solution to get your truck back to normal.
A Technician’s Notebook: The Case of the Haunted S10
I once had a 2001 S10 in my bay that was driving its owner crazy. The dome light would flicker randomly, the radio would shut off, and the anti-theft light would stay on, sometimes preventing it from starting. The owner had already replaced the battery and checked the grounds. After hooking up my scan tool, I saw a slew of communication error codes (U-codes) pointing to the BCM. These modules, often located under the dash, are prone to failing from years of heat cycles causing tiny cracks in the solder joints. We swapped in a VIN-programmed BCM like this one, and every single electrical gremlin vanished. It’s a common failure, but thankfully, a very fixable one.
Why a Pre-Programmed BCM is the Smart Choice
Replacing a BCM isn’t just about swapping hardware. The module must be programmed with your vehicle’s specific Vehicle Identification Number (VIN) and factory-installed options to function correctly. We handle this critical step for you. Simply provide your VIN at checkout, and we will flash this module with the latest official GM software updates. This ensures it communicates perfectly with your truck’s other computers, saving you from a costly and time-consuming trip to the dealership for programming.
Common Signs of a Failing BCM
If your vehicle is experiencing any of the following, a bad BCM is a likely culprit. Replacing your failing 2001 Blazer S10 BCM can resolve these issues:
- ✔ Erratic or non-functional interior and exterior lights
- ✔ Power windows, locks, or mirrors working intermittently or not at all
- ✔ The security or anti-theft light staying on, possibly causing a no-start condition
- ✔ Inaccurate gauge readings on the instrument cluster
- ✔ The radio or climate control system turning on and off by itself
- ✔ Diagnostic Trouble Codes (DTCs) related to lost communication, such as U1000.
A Straightforward Guide to Installation
Installing your new BCM is a manageable job for a DIYer with basic tools. While the exact location can vary slightly by model, the process is generally the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On the 2001 Blazer S10/Jimmy S15, the BCM is typically located in the center dash area, often accessible by removing the lower dash panel or glove box. On full-size trucks and vans, it’s usually on the driver’s side, to the left of the steering column.
- Disconnect and Remove: Carefully unplug the electrical connectors. 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 securely plug in all the 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—lights, windows, locks, etc.—to confirm the repair.
Important Post-Installation Notes:
While this module is programmed for your VIN, some vehicles may require additional syncing procedures. If the airbag light is illuminated after installation, 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 sensor relearn to ensure proper brake light and traction control operation. Always consult a factory service manual for model-specific details.
Verified Vehicle Compatibility
This Body Control Module is a direct-fit replacement for vehicles using service numbers 19208539, 9371990, or 9385236. Please verify your part number or contact us with your VIN to confirm fitment for your specific vehicle. It is guaranteed to fit the following models:
- 2001 Chevrolet Blazer S10 / GMC Jimmy S15 (center dash)
- 2001 Chevrolet S10 / GMC Sonoma S15 (center dash)
- 2001 Oldsmobile Bravada (center dash)
- 2001 Chevrolet Astro / GMC Safari (LH dash)
- 2000 Chevrolet Silverado 1500 / 2500 Pickup (LH dash, ID 9371990 or 9385236)
- 2000 GMC Sierra 1500 / 2500 Pickup (LH dash, ID 9371990 or 9385236)
- 2000 Chevrolet Tahoe / Suburban 1500 / 2500 (LH dash, ID 9385236)
- 2000 GMC Yukon / Yukon XL 1500 / 2500 (LH dash, ID 9385236)
This is the definitive solution for your 2001 Blazer S10 BCM replacement needs. Best of all, there is no core charge. You can keep your old module without any extra fees or hassle.
Frequently Asked Questions
What is a BCM and what does it do?
The Body Control Module (BCM) is a computer in your vehicle that controls non-engine-related functions. This includes power windows, door locks, interior and exterior lighting, the security system, wipers, and more.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive your VIN, as we need it to program the module correctly.
Is this a simple plug-and-play installation?
Yes, because we program the module to your VIN before shipping, it is a direct plug-in replacement. No dealership programming is required. However, as noted, some vehicles may require a minor relearn procedure for the airbag or brake systems if a warning light appears.
What if my airbag light is on after I install the BCM?
This can happen occasionally. It means the new BCM needs to be electronically ‘introduced’ to the airbag system’s computer (SDM). A mechanic with a professional-grade diagnostic tool can perform the ‘Setup SDM Primary Key in BCM’ procedure to sync the systems and turn off the light.
Do I need to send my old BCM back?
No. This product has no core charge. You can keep your original module, which saves you the time and expense of shipping a core back.