What Is A Crash Detection System In A Car?

May 19, 2025

BMW Front Grill and ADAS Camera Sensor


Are you wondering, "What is a crash detection system in a car, and how does it work?" You're not alone. Many drivers are curious about this life-saving technology. In this blog, we’ll explain what crash detection systems are, how they help keep you safe, and why they matter when you're on the road.


Vehicle ADAS sensors on front bumper of grey vehicle.


What Does a Crash Detection System Do?


A crash detection system in a car is designed to identify if you've been in an accident and automatically take action. This system uses sensors, onboard computers, and sometimes your smartphone to detect a collision. It can call emergency services, unlock your doors, turn on hazard lights, and even send your location to first responders.


Audi ADAS sensors in front bumper grill on grey Audi.


How Does a Crash Detection System Work?


Here’s a quick breakdown:


  • Motion sensors detect sudden stops or changes in direction.


  • Impact sensors in bumpers or doors sense physical contact.


  • GPS tracks your location in real time.


  • Telematics systems like OnStar, Toyota Safety Connect, or Ford SYNC alert emergency responders.


Some crash detection systems are also built into smartphones like iPhones and Google Pixels. When a crash is detected, your phone can automatically dial 911 or alert your emergency contacts.


Vehicle ADAS sensors on rear bumper of grey vehicle.


What Happens After a Crash Is Detected?


When a crash detection system activates, your vehicle or phone can:


  • Automatically call 911 or roadside assistance.


  • Send your exact GPS location to help responders find you quickly.


  • Notify your emergency contacts.


  • Unlock your car doors for rescue.


  • Shut off the fuel pump to prevent fires.


  • Turn on hazard lights to alert others.



Vehicle ADAS camera in dark grey Tesla vehicle fender.


Why Is a Crash Detection System Important?


Crash detection systems can save lives. Here’s why they matter:


  • Faster emergency response – every second counts.


  • Increased safety – especially if you’re unconscious or unable to call for help.


  • Peace of mind – your family knows you’ll get help if something goes wrong.



BMW Driver's Side Mirror ADAS Sensor on Black BMW.


Do All Cars Have Crash Detection?


Not all vehicles have crash detection systems. They are usually found in:


  • Newer model vehicles (2018 and up)


  • Cars with advanced safety packages


  • Luxury or higher trim levels




You can also get crash detection through aftermarket devices or by using a smartphone with crash detection features enabled.



Can I Add Crash Detection to My Current Car?


Yes! If your car doesn’t have built-in crash detection, you can:


  • Use a smartphone with crash detection (like an iPhone or Pixel).



Have more questions about your crash detection system? We can help! We can help Lou's Car Care & Fleet Services has been proudly serving Baldwinsville, NY, and surrounding communities since 1976. Call us or schedule your next appointment online today! 


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