About a year ago I had to buy a second hand Vauxhall Vivaro van. It runs well. I had to install a new driver's side electric window switch at first because the driver's window was not reliable in operation.
Recently I had an intermittent door speaker problem in the driver's door, AND the driver's window would not open. At first I suspected broken wires in the door jamb.
Anyway, today I discovered that there is a plug in the door jamb. To release it I had to lever up a horseshoe shaped clip at the top of the plug. The plug then just pulls out. After spraying in some Servisol electrical cleaner and lubricant and inserting the plug and removing it several times, both the speaker and window now work correctly.
I hope that this info helps Vivaro owners.
Bye,
Z.