My car is an 18 year old low-budget vehicle and all the connections have some sort of overlapping boots that are tight fitting. The ones that get pulled apart from time to time for maintenance, like headlights, are made of rubber. I'd be very surprised if your 19 year old car doesn't have same.

To be more particular about my original comment about connector corrosion--- this does not seem to be a problem for connectors like ring ends that are clamped together tightly. Paddle ends that are male/female and can be pulled apart definitely will corrode. I live in a coastal area and have had this issue with every one of my 3 planes. And even a ring connector, if a little loose, will also corrode. Found one behind the panel recently. Yes, that was a hair-pulling, new cuss words adventure in finding out why more than 1 but not all electronic gizmos were acting mysterious. Quite a relief tho when 10 cents worth of electro-spray and a screwdriver solved the problem!