Skip the auto shop - Our mechanics make house calls

How a Keyless Push-Button Ignition Works

Keyless Ignition Works

Technology has advanced for automotive security and user-focused features, and a shift is occurring where traditional key-and-cylinder starting systems are being replaced by keyless push-button ignition systems. They are incredibly simple to operate and provide excellent security.

The system was developed initially in the mid-1990’s by Siemens and was released first in Mercedes-Benz vehicles as Keyless Go. Since then, their popularity has grown exponentially. Now, keyless push-button ignition systems are known by dozens of different names depending on the auto manufacturer, including:

  • SMART Key
  • Keyless Go
  • FAST Key
  • Intelligent Key
  • Comfort Access

How it Works

Keyless push-button ignition operates based on low-frequency radio ID. Your key fob is a transmitter equipped with a specific electronic ID tag and the signal is amplified with a battery in the key fob. When you are in close proximity to your vehicle, antennas around your vehicle recognize your key fob’s presence and allow you to unlock and lock your doors with the press of a button on the handle, if it is so equipped.

When you enter your car, the antennas around your vehicle make comparative calculations to determine that you are indeed inside. The antennas transmit the electronic ID from the key fob to the receiver module. When you press the ignition button to start the car, the receiver disables the immobilizer, powers the starter circuit, and the engine turns over.

If the key fob battery is dead, you may not be able to unlock your doors or start your car in the same fashion. Manufacturers typically include a backup source to start your car such as a key shaft hidden in the fob. There is a location in the dash it needs to be inserted where another antenna or transponder ring picks up the diminished signal and allows the car to start.

If you lose your key fob, your car will not be able to start at all. You will need to have a new key made in order to use your car again.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...
Auto Safety Tips
Driving is more than a way to get from point A to point B. Owning and driving a car can also be a highly enjoyable experience. Whether a person is driving...


Related questions

Q: The car has to be jump-started, the dash shows lights on

There is a service bulletin to replace the two battery cable ends on these vehicles. It seems like the cable ends do not tighten and make good contact. You would have enough power to lock and unlock doors, and you...

Q: All dash lights and headlights work, but car won't start.

The starter signal goes through the ignition switch through the clutch switch or automatic shift position sensor then it gets passed to the starter relay. The starter relay controls the starter. My recommendation is to have the system checked by...

Q: Broke key triggers anti theft system on 2011 camaro.

The broken key set may no longer be giving off the signal saved in the vehicles anti-theft system. If the vehicle cannot verify the signal for the key, it will not start as if someone was trying to steal the...