Hi Guys,
I've done a lot of digging and turned up some rather interesting stuff on getting the sat nav working with my new head unit.
I a bit of circuit diagram from the inside of the OEM head unit and it appears to loop back to the sat nav to get it to work correctly (although without sound apparently, no bother to me, I don't use the sound anyway!) and if the loop is incomplete the sat nav doesn't work.
the bit of circuit I found and where to attach the wires is here:
I managed to find the bits I needed as:
2 x 100R 0,25W resistors,
1 x 68R 0,5W resistor,
2 x 18v 0,2W diodes
I have managed to source 2 x 100R 0,25W Resistors from work and have managed to blag a 68R 0,5W resistor on the next order from work so I'm 2/3 of the way there in terms of materials. I'm having trouble finding an 18v 0,2W diode though and I'm not sure how much of an issue it would be if I used a 0.5W diode (I can get these readily from work too!). Can any of you tech guys offer some advice if using a 0,5W diode would be ok or a definite no no?
Once I've got all the bits I'll keep you posted how I get on, if you're interested that is!