Hi guys, I've been running the first prototype (as in post #70) in my car for a little while, all works as intended.
During this time, I've drawn up and had made a batch of 3 PCB's, to make a neater (and easier to assemble) version:
Here's the fully assembled module, which has now been swapped into my car, and works as before:
So the time has come where I could make up some more for anyone interested.
One thing to note, my car is a UK RHD model with heated seats, and I've used a signal line used for the heated seat switch, as this is the only one available at the multi-way connector which indicates when the ignition is on. So if you have a LHD car, or no heated seats, someone would need to confirm first that the connections needed are still present at the multi-way connector. (Chances are that they are, as cars tend to have common wiring looms, and certainly on mine there are more wires to the connector than are used).
Also, any work done on your own car is entirely your responsibility!
I reckon it would be best to supply everything needed for an installation, which would comprise of this module, the other half of the 5-way connector, 5 piggy-back connectors, and some velcro sticky pads to mount it on the inside of the transmission tunnel near ISG switch. I could do these all for £20 (may be revised depending on part availability and effort required!), plus whatever it costs me to post it to you.
As I hope you'll understand, I'd only order in the parts and build them for definite orders, and some parts are best ordered in small quantities, so it could take up to a few weeks. And also please remember that this is a background 'hobby' for me.
Let me know if you'd like one!