Muchos thanks to you both Rog and dejay!
I presume the latching switches will cancel if you switch off the electric's/engine ie. self cancelling if power is lost?
I'll start sorting all the parts and getting ready to swap out the PCB. I so want the car to get me into old age and cause me as little trouble as possible and when my son finally get the keys I don't want his learning curve to ruin his ownership pleasure!
A latching switch does what it says…when the button is pressed to ON, it stays in that state until the button is pressed again to go OFF. However, the electrical supply may well be cut if it is sourced via the car ignition switch when that is turned OFF. But when you turn the ignition switch again to ON, items controlled via the push button either directly or via a relay coil, will come on again, until it is pressed once again to the OFF position. So having buttons or switches that light up when ON is very useful in reminding you that items are still switched on.
Good luck with your task but bear in mind that there is a fair amount of soldering and crimping activity involved in a tight space, together with searching for the correct wires hiding in the loom!
