Editing Remote Boot Release for S2 (section)

==Wiring==
The wiring required is pretty simple, but it is pretty important you understand it because if you connect the wrong thing to the other wrong thing there is a good chance you can do some damage to either your car or yourself. Before you start cutting wires, disconnect your battery.

If you don't understand what a relay is or does, read the [http://wiki.seloc.org/a/Remote_Boot_Release_for_S2#Random_Questions Random Questions] bit of this page. It will hopefully make a lot more sense then.

===Ground and Live sources===
There are a number of places you could get a ground and live connection in the car, but I am going to assume you are going to use the same place as me: the auxiliary power socket between the seats.

Two wires run into the auxiliary power socket connector, a ground wire (black) and a 12v live wire (purple). You will need to splice another wire into both of these wires.

"Why use the auxiliary power socket?" I hear you ask. Because it already uses a reasonable high ampage fuse (20 amps) so can take the current from using the solenoid easily. And the auxiliary socket circuit (in the car) isn't shared with anything else - so if you do cock it up, there isn't anything else you can fry on the same circuit. The interior light for example is shared with the alarm system (and you don't want to be messing with that!).

===The relay===
The relay will have pins on it corresponding to the two circuits which run within it (the coil circuit and the switch circuit).

I will assume your relay has the same numbers on is as mine does (If your relay does not have the same numbers on the pins, normally a small circuit diagram on the side of the relay will describe what each pin refers to).

*Pin 85 - Coil live
*Pin 86 - Coil ground
*Pin 30 - Switch live
*Pin 87 - Switch ground

===The circuits===
Two simple circuits need to be made - one with a button in it, the other with the solenoid in it. Parts of both of these circuits run through the relay.

If you can read a circuit diagram, you can probably make sense of this diagram. If you can't allow me to explain.

;Circuit 1 - "Button circuit" : This circuit runs from the 12v power supply (ie a live in the car somewhere), then through the button, then through the relay's coil, and finally to a ground in the car.

;Circuit 2 - "Solenoid circuit" : This circuit runs from the 12v power supply through the switching part of the relay, then through the solenoid, and finally to a ground in the car.

What Circuit 1 does is when the button is pressed, it completes the circuit, and energises the coil in the relay. The energised coil closes the switch on the Circuit 2 part of the relay. Circuit 2 is now complete, so the solenoid is activated. Circuit 2 will remain complete until the button in Circuit 1 is released.

[[Image:Circuit-diagram.jpg]]

The numbers in the diagram above in the relay (the box at the top) correspond to the pins on the relay.
===The wiring===
I decided to buy red and black cable and use the red for the 12v feed, and black for ground. I got 6m of both (and used a lot more of the red than black). How much cable you will use will entirely depend on where you decide to mount the solenoid in the engine bay, the relay and the button. Just unravel some cable and lay it out through the route you are going to send the wire before cutting some off. More about which wire goes where later.