Restore Full Electrical Function to Your Vehicle
Are you battling bizarre electrical issues in your Chevrolet Monte Carlo or Impala? From flickering lights and malfunctioning power windows to a security system that prevents your car from starting, a failing Body Control Module (BCM) is often the culprit. The BCM acts as the central nervous system for your vehicle’s body electronics, and when it fails, it can create a cascade of frustrating and seemingly unrelated problems. This replacement Body Control Module, part number 10350647, is the definitive solution to restore your car’s proper operation.
We take the guesswork and dealership hassle out of the repair. Simply provide your vehicle’s VIN during checkout, and we will program the module with the latest GM software updates specific to your car. This ensures that it integrates seamlessly with your existing systems, making the installation process as straightforward as possible. This module is a direct replacement for multiple service numbers, including 10323612, 10340320, 10432318, 10432571, 10438145, and 10445875.
Diagnosing a Faulty 2000-2004 Monte Carlo BCM
A failing BCM can manifest in numerous ways, often making diagnosis difficult. If your vehicle is experiencing several of the issues below, there is a high probability that your BCM is the root cause. Replacing it with our pre-programmed unit can resolve these persistent electrical gremlins for good.
From the Diagnostic Bay
We had a 2003 Impala come in that the owner described as ‘haunted.’ The dome lights would randomly turn on while driving, the radio would shut off, and worst of all, the security light would flash, preventing the car from starting about once a week. The owner had already replaced the battery and checked grounds. After connecting our diagnostic tool, we saw multiple communication loss codes (U-codes) pointing to the BCM. Instead of a costly and time-consuming repair at the dealer, we installed one of our VIN-programmed modules. The car started right up, and all the ‘haunted’ electrical issues were gone instantly. It’s a common story for these vehicles, and a correctly programmed BCM is the key.
Common Symptoms of BCM Failure
- ✔ Intermittent or non-working power windows, door locks, and interior lighting.
- ✔ GM Passlock or Passkey security system issues, causing a no-start condition with a flashing security light.
- ✔ Instrument cluster gauges behaving erratically, dropping to zero, or not working at all.
- ✔ Radio, HVAC, or climate control systems functioning incorrectly or not at all.
- ✔ False warning lights appearing on the dashboard (e.g., ABS, Airbag, Traction Control).
- ✔ Horn honking unexpectedly or not working when pressed.
Installation and Post-Install Procedures
This module is delivered programmed and ready for installation. Since there is no core charge, you can keep your original module. While the goal is a plug-and-play experience, some vehicles may require minor post-installation steps to sync with other onboard systems. These typically require a professional bidirectional scan tool.
- Airbag System Sync: If the airbag warning light is illuminated after installation, a ‘Setup SDM Primary Key in BCM’ procedure is needed to sync the new BCM with the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Relearn: On some models, a brake pedal position sensor recalibration might be necessary to ensure correct brake light operation and traction control functionality.
Always consult a factory service manual or a qualified technician for vehicle-specific procedures.
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 and monitors non-engine-related electronic accessories. This includes power windows, locks, lights, the security system, wipers, and more.
Why do I need to provide my VIN?
We program the BCM specifically to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures the module has the correct software and calibration to communicate properly with your car’s other computers and that all factory options work as intended.
Is this part difficult to install?
The physical installation is straightforward, as the BCM is typically located under the driver’s side dashboard. Because it comes pre-programmed, it eliminates the need for dealer-level programming. However, some vehicles may require the post-install relearn procedures mentioned above, which require a professional scan tool.
Will this fix my car’s security (Passlock) problem?
A faulty BCM is one of the most common causes of Passlock security system issues in 2000-2004 Monte Carlo and Impala models. If your car won’t start and the security light is flashing, this programmed module is the correct repair for a BCM-related fault.
Which part number will I receive?
You will receive part number 10350647, which is a direct, compatible replacement for all the service numbers listed, including 10323612, 10340320, 10432318, 10432571, 10438145, and 10445875.