DEI used to, at least, make a programmable timer controller that could start the car X days a week at whatever time you programmed. It was only $30 or so from memory - if you work a regular schedule that might be an much easier way to go.
As far as your drawings, I think you are putting the cart before the horse. You need to buy a phone, take it apart, and measure the voltage and configuration you are going to be working with.
If the vibrator motor has a constant ground and a switched positive you will need to know the magnitude of the voltage and purchase either a low current relay with the proper coil voltage or put a transistor between the vibrator motor and the relay. I would NOT use an electromechanical relay as they generally pull too much current..
If the vibrator motor has a constant voltage and a switched ground (which is more likely) you could possibly tie the ground trigger directly to the unit, assuming your phone and your car are grounded together. As you already mentioned the start input uses virtually no current (most likely a transistorized input) so it shouldn't damage the phone.
Until you know how the phone you are using is configured it is impossible to offer many more solid suggestions.
While you have the phone open, it may be beneficial to see if you can hardwire in to the "END" key - this would allow you to stop the vibrating instead of just breaking the connection. This would allow you to use the phone to both start and stop the vehicle!
Kevin Pierson
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