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Actually, respectfully, on the S124, it is for the rear wiper circuity. It completes a connection if the multi-switch is in the wiper-on position AND the car is in reverse, i.e. the back-up lights are on. The rear window wiper automatically comes on when the wipers are on and the car is in reverse.
You can tape it over, or remove the plug cover an desoldier the line. Either way, it won't impact your vehicle (unless you have a wagon, in which case you should plug it in).
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