Is Your GM Truck or Van Acting Possessed?
If you’re dealing with a frustrating storm of electrical gremlins in your 2003-2007 GM vehicle, you’re not alone. One day the dome light won’t turn off, the next your power windows have a mind of their own, and the security light is flashing for no reason. These aren’t separate problems; they’re classic symptoms of a failing Body Control Module (BCM). The BCM is the nerve center for your vehicle’s body electronics, and when it starts to fail, it can make driving a nightmare.
Are You Experiencing Any of These Common BCM Failure Symptoms?
- ✔ Erratic or non-working power windows and door locks.
- ✔ Interior or exterior lights staying on, flickering, or not working at all.
- ✔ The security system engaging randomly, preventing the vehicle from starting.
- ✔ Horn honking unexpectedly or not working when you need it.
- ✔ Dashboard warning lights (like the airbag light) appearing without a clear cause.
- ✔ Wipers activating on their own or not responding to the switch.
From the Shop Floor: A Real-World Diagnosis
“A customer’s 2005 Silverado 2500 came into my shop last month with a dead battery every morning. He had already replaced the battery and alternator, but the problem persisted. A parasitic draw test pointed to the interior lighting circuit. After a bit of digging, we found the BCM was keeping the retained accessory power (RAP) relay active long after the key was off, draining the battery overnight. It wasn’t the battery or the lights themselves; it was the BCM failing to go to sleep. Replacing the BCM solved the issue instantly.”
The Direct Solution: A Programmed 2003-2007 GM BCM
Don’t waste time and money chasing down individual electrical faults. This Body Control Module is the definitive solution, arriving at your door pre-programmed specifically for your truck or van. We use your Vehicle Identification Number (VIN) to load the latest official GM software, ensuring it communicates perfectly with your vehicle’s other modules right out of the box. This completely eliminates the need for an expensive trip to the dealership for programming.
Simple, Hassle-Free Installation
We designed this to be a straightforward fix for the confident DIYer or any professional technician. Follow these general steps to get your vehicle back to normal.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the BCM: On most Silverado and Sierra pickups, it’s located under the driver’s side of the dashboard, near the steering column. On Express and Savana vans, it’s typically found behind the center dash panel.
- Remove Connectors: Carefully unplug the multiple wiring harnesses connected to the old BCM. The connectors have release tabs that need to be pressed.
- Swap the Module: Unbolt or unclip the old BCM and remove it. Install the new module in its place, ensuring it is securely mounted.
- Reconnect Everything: Plug all wiring harnesses firmly into the new BCM. You should hear a click as they lock into place. Reconnect the negative battery terminal.
Expert Pro Tip: Check for Water Intrusion
Before installing your new BCM, take a moment to inspect the area for any signs of moisture, staining, or corrosion, especially on trucks with windshield leaks. Water damage is one of the leading causes of BCM failure. A simple cowl or windshield seal leak can drip directly onto the module, shorting it out. Addressing any leaks now will protect your new investment.
CRITICAL: Post-Installation Procedures Required
After installing your new BCM, a few final steps are necessary to ensure all systems are fully operational and safe. These procedures require a professional-grade diagnostic scan tool.
- Airbag System Reset: To clear the airbag warning light, you MUST perform the ‘Setup SDM Primary Key in BCM’ procedure. This re-establishes communication between the BCM and the airbag system’s Sensing and Diagnostic Module (SDM).
- Brake Pedal Position Sensor Relearn: Some vehicles may require a brake pedal position sensor relearn or recalibration. This is crucial for proper brake light operation and stability control functions.
Note: If you are not equipped to perform these steps, we strongly recommend seeking assistance from a qualified automotive technician.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks, vans, and the SSR. It is compatible with the following part numbers:
15167329, 15194169, 15747545, 15136224, 15116065, 15198115, 15136876, 10367689
Please refer to the detailed fitment list on this page to confirm this part is correct for your specific year, model, and options. Simply provide your VIN at checkout, and we’ll handle the rest.