Restore Full Functionality to Your GM Truck or SUV
Is your Silverado, Sierra, S10, or Blazer suffering from strange and unpredictable electrical problems? Flickering lights, malfunctioning power windows and locks, or a security system that acts up are all classic signs of a failing Body Control Module (BCM). The BCM is the central command center for your vehicle’s body electronics, and when it starts to fail, it can cause a cascade of frustrating issues. This replacement Body Control Module, compatible with part number 191583625 and others, is the definitive solution to restore your vehicle’s electronic systems to factory-perfect condition.
Unlike a generic part from a local store, this BCM is a complete, ready-to-install solution. We take the hassle and high cost of dealership programming out of the equation. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest GM software specific to your truck or SUV. This ensures seamless integration and proper function of all your vehicle’s features right out of the box.
From the Diagnostic Bay
We had a 1999 Silverado 1500 in the shop that was driving the owner crazy. The dome light would stay on, the radio would randomly shut off, and the power door locks worked only when they wanted to. The owner had already replaced the battery and checked all the fuses. After connecting our diagnostic tool, we saw multiple communication errors pointing towards the BCM. Instead of a costly trip to the dealer for a new module and programming, we installed one of our pre-programmed units. The installation took less than an hour, and instantly, all the electrical gremlins were gone. It’s a common failure on these trucks, and a pre-programmed module is the most efficient fix.
Common Symptoms of a Failing GM Truck BCM
- ✔ Erratic or non-functional interior and exterior lights (headlights, dome lights, dash lights).
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security system or anti-theft light (Passlock) activating incorrectly, preventing the engine from starting.
- ✔ Wipers or radio turning on and off by themselves.
- ✔ Inaccurate or dead gauges on the instrument cluster.
- ✔ Warning lights such as the airbag or ABS light staying illuminated.
- ✔ Poor battery life due to parasitic draw from a faulty module.
Installation and Required Procedures
Physically installing this BCM is a straightforward process, typically located behind the dashboard on the driver’s or passenger’s side. Because this module comes pre-programmed to your VIN, it eliminates the need for expensive dealership tools for the initial setup. However, depending on your specific vehicle, a couple of simple relearn or synchronization procedures may be necessary after installation to ensure all related systems communicate correctly.
Post-Installation Steps:
- Airbag System Sync: If the airbag warning light is on after you install the new BCM, a ‘Setup SDM Primary Key in BCM’ procedure is required. This syncs the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM) and must be done with a professional-grade scan tool.
- Brake Pedal Position Relearn: Some models may require a brake pedal position sensor recalibration. This ensures your brake lights function correctly and that the traction control system operates as intended.
Always consult a factory service manual or a qualified technician for vehicle-specific instructions.
Frequently Asked Questions
What does a Body Control Module do on my 1999 Silverado?
The BCM acts as the brain for your truck’s body electronics. It controls non-engine related functions like power windows, locks, lights, wipers, the security system, and the instrument cluster.
Is this BCM truly plug-and-play?
Yes, it is programmed to your vehicle’s VIN before shipping, making it a plug-and-play installation. However, as noted, some vehicles may require a simple airbag sync or brake pedal relearn procedure with a scan tool to clear warning lights after installation.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact software and calibrations specified by GM for your truck’s unique features and options. This ensures perfect compatibility and avoids a trip to the dealership.
Where is the BCM located on my S10 or Blazer?
On most S-series trucks and SUVs from this era, the BCM is located in the center of the dashboard, often behind the glove box or radio. On full-size trucks like the Silverado and Sierra, it’s typically on the left-hand (driver’s) side of the dash.
What happens if the airbag light comes on after I install it?
If the airbag light appears, it simply means the new BCM needs to be electronically ‘introduced’ to the airbag module. A technician with a capable scan tool can perform the ‘Setup SDM Primary Key in BCM’ procedure in a few minutes to resolve this.
Do I need to send my old BCM back?
No, there is no core charge for this part. You can keep your original module.