The wires simply unplug. There is the connector for the auto dimming mirror that is separate from the other connector, but you should just be able to unplug them. If not, you could try to separate the mirror. The bottom part with the red and green light has to come out first which it's held in place by 4 tabs, the bottom portion is also the part that holds the connectors. Good luck

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1990 190E 3.0L