1990 560 SEC Euro Spec model originally from Japan.
I have a strange issue with my power windows.
At any given time they all fail to work, along with the power seats. Then by
some miracle the cure themselves and work for a while.
I have changed the fuses involved to the copper electrode ones from the
aluminium ones, and have even swapped relays around to no avail.
Sometimes when they are not working, if I open the drivers door the windows
will suddenly start working again!
Could this be an ignition switch issue? is there some other relay involved
that i am not considering?
Any insight would be much appreciated.