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Dear jerryc,
Hope you're well. I'd guess that all 940s sold in North America have factory-installed rear window de-foggers, i.e., a heating element, that helps to clear condensation or snow/ice. There should be a dashboard switch, that activates the heater.
Most 940s sold in North America also were equipped with mirrors, that have built-in heaters, to help clear condensation or snow/ice. Even if the car doesn't have mirrors with heating elements, I'd guess that the wiring is present in all cars, so that mirrors with heating elements can be retro-fitted.
Thus, if a car sold in southern Florida or California is moved to a northern US state (or to Canada), the non-heated mirrors can be replaced with units that have the heating element. If the factory-installed switch only allows for control of a heated rear window, then the switch has to be replaced with a unit (#1362343), that will control both the rear window heater and the mirror heaters. This is a plug-and-play swap, as the wiring is present.
These switches contains a relay which - as do most relays - eventually fails.
Hope this helps.
Yours faithfully,
Spook
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