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The last time I heard of Multiplex in car electrics was from Peugeot/Citroen on the 307 and C5.
The idea is that 'Multiplex' allows the manufacturers to use far less wiring in the car. An on board computer controls which signals get fed down which wires at which time.
My old C5 had Multiplex and it was a real pain. Examples of the 'pain' was that you could press the button to fold the door mirrors and you could wait anything up to 20 seconds for the mirrors to actually fold. Same with flashing the headlights, once you pulled the lever it could be 5 seconds later before the headlights actually flashed.
From what I could gather the on board computer had decided that other functions were being sent down that particular circuit and your latest request had to wait.
No doubt the whole idea has been modified now.
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