I am sure by now everyone has heard the idea that you can open your doors on your car from a remote location via Cell Phone.
Picture this, you lock your keys in your car along with your RKE (Remote Keyless Entry). You call your wife who is 100 miles away on her cell phone from your cell phone. You hold your cell phone close to the car while she hits the unlock button on the second Remote Key less Entry near her cell phone mouth piece and the door Unlocks!
I have read on the Internet of people who have tried it and it worked along with those who say it is impossible because of the difference in frequencies. I had to ask my service specialist who works on remote key less entry systems, along with all locking systems, window motors, electronics, car computers, etc. He is one of the most knowledgeable people I know when it comes to working on cars. He said it is definitely possible.
After confirmation from him, I had to try the theory. I know I looked crazy holding my cell phone near the car and waiting in anticipation for the result I wanted. I held it near the door with no results. I told my wife to hit the unlock button again while holding my phone near the windshield, closer to the actual sensor that communicates with the remote key less entry. I was nearly 1 mile away with obstruction and hills in the way and was very surprised when the door unlocked. I have seen it work! It may have been a fluke of some kind because it makes no sense to me, but it did work on a 2001 Pontiac Grand Am. Although it did unlock the door 2 times, it would not lock the car, pop the truck, or sound the panic system.
I have no explanation for this working, but have had others say they tried it and it worked for some and not for others. My car is not equipped with OnStar and it is a factory remote keyless entry system. Please do not call me crazy, but I welcome all comments whether it works for you or does not work for you. Like I say, I have no explanation. I have read the other sites saying this was a chain letter to be funny and there is no way it would work with the difference in frequencies. My remote will barely work from 10 feet away so how could it work 1 mile away. I will try it from a further location when time permits. Let me know what you think...
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Monday, April 30, 2007
Remote Keyless Entry Unlock Doors Via Cell Phone
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4 comments:
We just tested this at work about 1/4 mile away from the car. We tried numerous times with just the remote to make sure we were out of range and it didn't work. We made the cell phone call and BOOM it worked, both unlocking and locking. This was tested on a Subaru Tribeca.
Worked on a 2005 Nissan Almera and a 2006 Hyundai Tucson. Both had factory installed remotes.
Had the opportunity to test this *theory*.
Result- It doesnt work.
2007 Nissan Altima are both cell proof and dern near Fort Knox proof for gaining access when the remote is
stuck between the drivers seat and arm rest.
... Take it from a RF engineer... this simply cannot work! and here's why:
A cell phone picks up sound waves (ie. your voice) by a microphone, then encodes that into a data stream and transmits via RF waves to the cellular network in an 800Mhz frequency range.
A microphone cannot pickup RF signal. An RF signal uses electo-magnetic waves. Sound is the result of rising and falling pressure waves through a medium (ie. air) which a microphone can pickup.
Yes, the antenna receives RF waves, but only in the 800Mhz range, and it 'listens' to signal from the cell network to play the audio of the remote party on your speaker... any received RF signal is NOT retransmitted to the cellular network.
Your keyless entry remote uses RF signal to transmit a code to the receiver in your car, not audio.
Saying this would work would be just as far-fetched as saying if you pointed a flashlight (which by the way, light waves function MUCH more similarly to RF waves than sound waves) at a cell phone in one location, the light would be transmitted to a cell phone on the other end of the call.
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