Is Your GM Vehicle Experiencing Bizarre Electrical Issues?
If your Cadillac, Chevrolet, GMC, or other GM vehicle is suddenly acting haunted—with flickering lights, malfunctioning power windows, a security system that won’t cooperate, or a battery that mysteriously drains overnight—the culprit is often a failing Body Control Module (BCM). The BCM is the central nervous system for your car’s body electronics, and when it malfunctions, it can cause a cascade of frustrating and unpredictable problems. This replacement BCM, part number 15921353, is the direct solution to restore order and functionality to your vehicle.
From the Diagnostic Bay
We had a 2010 Cadillac STS come into the shop with a complaint of a dead battery every morning. The owner had already replaced the battery and alternator, but the problem persisted. After a thorough parasitic draw test, we traced the issue to the BCM, which wasn’t ‘going to sleep’ after the car was turned off, slowly draining the battery. Replacing the BCM solved the issue completely. It’s a classic example of how a faulty module can cause symptoms that seem unrelated at first glance.
Common Symptoms of a Failing BCM
- ✔ Erratic or non-functional interior and exterior lights.
- ✔ Power windows, door locks, or mirrors working intermittently or not at all.
- ✔ The security system or keyless entry failing to operate correctly.
- ✔ Unexplained parasitic battery drain leading to a dead battery.
- ✔ Warning lights on the dashboard, such as the airbag or service vehicle light.
- ✔ Horn honking randomly or not working when pressed.
Why Choose Our Pre-Programmed 2010 STS Body Control Module?
Getting back on the road shouldn’t be complicated. That’s why we offer this BCM fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates correctly with your car’s other systems right out of the box. Simply provide us with your VIN during or after checkout, and our technicians will flash the module with the latest GM software updates for your exact vehicle. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
This module is a direct replacement for a wide range of original part numbers, including 15921353, 22860591, 25892622, and many others listed in the fitment guide. It is designed to meet or exceed original equipment specifications for reliability and performance.
Important Installation Notes
While this module is delivered ready for installation, some vehicles may require additional relearn procedures after the BCM is installed. These are simple steps that can often be performed with a capable bi-directional scan tool.
- Airbag System Sync: If your airbag warning light is illuminated after installation, a procedure called ‘Setup SDM Primary Key in BCM’ is necessary to sync the new BCM with the airbag system.
- Brake Pedal Position Relearn: To ensure correct brake light and traction control operation, a brake pedal position sensor recalibration may be required on certain models.
Always consult a factory service manual or a qualified technician if you are unsure about these procedures. There is no core charge for this part, so you can keep your original module.
Frequently Asked Questions
What does a Body Control Module (BCM) do?
The BCM is a computer that manages and controls many of your vehicle’s non-engine related functions, such as power windows, locks, lights, wipers, security system, and climate controls.
Is this BCM ready to install when I receive it?
Yes, it is. We program the module to your vehicle’s VIN before shipping, so it is plug-and-play. However, as mentioned, some models may require a simple key or sensor relearn procedure after installation.
How do I provide my vehicle’s VIN?
You can add your VIN to the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship the module until it has been programmed.
What happens if I don’t replace a failing BCM?
Ignoring a faulty BCM can lead to progressively worse electrical problems, including a persistent dead battery, a vehicle that won’t start, or the failure of critical safety systems like exterior lights.
Do I need to send my old BCM back?
No. This part is sold without a core charge, so you are not required to return your original module.
This part fits many vehicles. How do I know it’s right for mine?
The best way is to match the part number from your original BCM to one of the numbers listed in our description. Our VIN programming service ensures it will work correctly for your specific options package.