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Old 09-02-2014, 07:51 PM   #1
Registered User
Join Date: May 2014
Location: PNW
Posts: 117
My Ride: BMW 325i
RemoteIgnition switch

This is project of mine that started over a year ago, I think. Basically this "module" replaces physical ignition switch and hooks into car's K/I-bus. I know that there are devices specifically designed for this, and installing one of those would probably be easier. However, I don't see "fun" in that, so I DIY it.

Some questions that might come up.

Q: What does it do?
A: Its main purpose is controlling car's ignition state. Off, accessories, ignition, and turn started. Second purpose is to send/receive data to/from k/i-bus, but I use this part only for locking/unlocking doors.

Q: Doesn't it make easier to drive-away the car?
A: No, not really. Immobilizer retains its functions making it as secure as from factory.

Q: Why would you do that?
A: For fun and convenience. Once I have my Moto 360, I won't even reach for the phone. Although I wouldn't use voice commands in public...

Q: How did you bypass immobilizer?
A: Without going into details, immobilizer is left alone and functions as it would with a key. Arduino is simply simulating the key.

Q: Why is there a delay?
A: Bluetooth connection time takes up to couple seconds. There is an option to keep persistent connection as long as car is within the range, but I prefer to not use it.

Q: Where is your headunit?
A: Gone.

Q: What if something fails?
A: There are multiple backup plans. Starting with simple NCF (in case of bluetooth failure or dead phone) and ending with manual switches and using actual physical near the immo coil (in case of 50A relays failure).

Q: Any sources or more information?
A: Yes, https://github.com/P1X3/BMWignition, but anything related to immo simulation or could possibly allow someone to drive-away my car is not included.

Last edited by PancakeBimmer; 09-02-2014 at 08:32 PM.
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