Is Your Vehicle’s Electrical System Acting Possessed?
If you’re experiencing a frustrating array of electrical gremlins in your Cadillac DTS or other GM vehicle, a failing Body Control Module (BCM) is the most likely culprit. The BCM acts as the central command center for your vehicle’s body electronics, managing everything from your power windows and door locks to your interior lights and security system. When it starts to fail, it can create a cascade of bizarre, seemingly unrelated problems that can be difficult to diagnose.
From the Diagnostic Bay
We recently had a 2009 Cadillac DTS come into the shop with a list of complaints that seemed endless. The driver’s side window would only work intermittently, the radio display would flicker, the anti-theft light would stay on, and occasionally the car wouldn’t start at all. The owner had already replaced the battery and checked all the fuses. After connecting our diagnostic scanner, we saw multiple communication errors pointing towards a single source: the BCM. Instead of a costly and time-consuming repair at the dealership, we installed a VIN-programmed module just like this one. The car was back to perfect working order in under an hour, saving the customer hundreds of dollars and a major headache.
Common Symptoms of a Failing BCM
- ✔ Intermittent or non-functional power windows, locks, or mirrors.
- ✔ Erratic behavior from interior or exterior lights (flickering, staying on, or not turning on).
- ✔ The security or anti-theft system light flashing, preventing the engine from starting.
- ✔ Dashboard warning lights illuminating for no apparent reason.
- ✔ Horn honking unexpectedly or not working at all.
- ✔ Problems with the climate control system or radio functions.
- ✔ A parasitic battery drain that leaves you with a dead battery overnight.
The Plug-and-Play Solution: A Pre-Programmed 2006-2011 DTS Body Control Module
Don’t let a faulty BCM keep your vehicle off the road. This replacement Body Control Module is the definitive solution to restore your vehicle’s full functionality. The single biggest advantage is our complimentary programming service. When you place your order, you provide us with your vehicle’s VIN. Our technicians will then flash the module with the latest GM software specific to your car’s exact configuration. This means the part arrives at your door ready for installation, completely bypassing the need for an expensive trip to the dealership for programming. It’s a true plug-and-play fix.
Installation and Post-Install Considerations
Installation is straightforward for a DIY mechanic or any professional technician. After disconnecting the battery, you’ll locate and replace your old module. Once the new module is installed and the battery is reconnected, most functions should be immediately restored. However, please be aware of a few potential post-installation steps:
- Airbag System Sync: In some cases, the airbag warning light may illuminate after installation. This requires a ‘Setup SDM Primary Key in BCM’ procedure using a professional scan tool to sync the modules.
- Brake Pedal Position Relearn: A brake pedal position sensor recalibration might be necessary to ensure correct brake light and traction control operation.
Always consult a factory service manual for your specific vehicle for detailed instructions.
Guaranteed Compatibility
This module, part number 20839063, is a direct replacement for a wide range of GM vehicles. It is compatible with numerous original part numbers, ensuring a perfect match. Please verify your original part number against the list below or confirm your vehicle is on the fitment list.
Replaces Part Numbers: 10382479, 15093910, 15276271, 15299986, 15819552, 15828601, 15837419, 15872388, 15872421, 15880684, 15921352, 15921353, 15948438, 15948439, 20815898, 20839063, 20864767, 20864768, 20921435, 20921436, 20935349, 22860591, 25826124, 25826125, 25847588, 25847589, 25892622, 25910474, 25934762, 25934763, 95151084
Frequently Asked Questions
What exactly does a Body Control Module do?
The BCM is a computer that controls and monitors the various electronic accessories in your vehicle’s body. This includes power windows, door locks, lighting, security systems, wipers, and more. It acts as a hub, receiving input from switches and sending commands to the relevant components.
Do I need to get this BCM programmed by a dealer?
No. This is the key benefit of our service. We program the module to your vehicle’s specific VIN before we ship it to you. It arrives ready to be installed, saving you time and the high cost of dealership programming.
Where is the BCM located on a 2006-2011 Cadillac DTS?
On the 2006-2011 Cadillac DTS, the Body Control Module is typically located behind the right-hand (passenger side) center of the dashboard.
Will this fix the ‘Service Theft System’ message on my dashboard?
Yes, in many cases, a faulty BCM is the root cause of erroneous security system warnings and no-start conditions related to the anti-theft system. Replacing it with this pre-programmed unit is a common and effective fix for that issue.
What if my airbag light is on after I install the new BCM?
If the airbag light comes on, it means the new BCM needs to be electronically synced with the vehicle’s airbag system computer (SDM). This requires a ‘Setup SDM Primary Key in BCM’ procedure, which can be performed by a repair shop with a professional-grade diagnostic tool.
Do I need to send my old part back?
No, there is absolutely no core charge for this part. You can keep or dispose of your old module at your convenience.