You received some good suggestions already. As previously mentioned, if the car is a sedan, it could be the rear circuit board. That would be my guess as I had a similar problem with my 90 sedan. You can try cleaning it if they are not too bad. If they are heavily corroded you are probably better off dropping $20 or so and buying a new circuit board for the passenger rear. BTDT...:)
I would take the spraying the switch a step further. Remove the switch. Clean/sand all the grounds. Then spray and reassemble.
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