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Old 10-21-2013, 09:48 PM   #1
Scooby Newbie
Member#: 340555
Join Date: Dec 2012
Chapter/Region: South East
2011 Impreza OBS

Default Using a phone as a passive fob for my car

I tend to lurk on this forum,since I don't really have much in the way of funds to modify my subie, and my experience is limited. I have worked on my own cars all my life, but it mostly covered getting them running again, not altering the performance. Sigh.

So I have seen plenty of cars that offer a passive fob to unlock the car and start it, no keys necessary, and I really want to do this with my car, but using my phone instead of a dedicated fob. I was going to go so far as to try and design a bluetooth device to do this, but someone beat me to the punch. No problem there. Anyways, there is an aftermarket unit I found that can be installed on pretty much any car, but it only unlocks the doors. Now, my goal would be add this unit (http://bluetoothkeyless.info/) and then have it activate another relay to disengage the engine immobilizer so that I could walk up to my car with only my phone in my pocket, have it unlock, and then be able to use a 'push to start' button to start the car. No keys, just a phone. Then when I walk away, the Bluetooth unit would do it's thing and lock the doors and engage the engine immobilizer again.

Just wondering if this idea is feasible. I would love to try and do it myself, but there is no way I could get the wife to sign off on the Bluetooth unit at this point in time. I likely won't be able to do this project for a few months. Possibly next summer.

So again, just wondering if an idea like this could really work.
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Old 10-22-2013, 09:18 AM   #2
NASIOC Supporter
Member#: 357467
Join Date: May 2013
Chapter/Region: NESIC
Location: CT
2015 STi


I think it's a great idea. Not to play negative nellie... but what about backup/security ideas? i.e. phone is stolen or it runs out of juice? Are you hailing cab or do you have a backup option?

As for logistics, I'm out on that one. But I definitely hope this comes to fruition for you.
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Old 10-22-2013, 09:37 AM   #3
Scooby Newbie
Member#: 259197
Join Date: Sep 2010
Chapter/Region: MWSOC
Location: Cincinnati
2014 WRX Sedan


It does sound pretty cool but also like an incredible amount of work. If you have the know how go ahead and give it a shot. Good luck!
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Old 10-24-2013, 08:36 PM   #4
Scooby Newbie
Member#: 366611
Join Date: Aug 2013

I think it would be bad ass!

I didn't see a price on the door lock one, any idea what it costs?
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Old 10-24-2013, 09:32 PM   #5
Scooby Newbie
Member#: 340555
Join Date: Dec 2012
Chapter/Region: South East
2011 Impreza OBS


The premium unit is a little over $200. Wish I could afford it right now.

With regard to a backup plan, I have none, but I generally do a pretty good job keeping some juice on my phone. I was also planning on keeping the keys active in case I needed to take it for service or something.
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Old 10-27-2013, 11:08 AM   #6
Scooby Specialist
Member#: 191557
Join Date: Oct 2008
Chapter/Region: TXIC
Location: Rockwall-East DFW
2004 WRX Wagon
WRB not so minty fresh


I want to see someone do this through the OBDII port like the Torque App for codes and monitoring.

The I believe OE diagnostics port can assess the lock/unlock on the Subaru.

that would be an awesome companion to Torque.

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