Hi,
The Switch is the most likely culprit. But, the second most likely would be the Top Relay. The PN# for pre-'03 cars is 986.618.111.02, don't have the PN# handy for post-'02 cars, but it's readily available.
The fact that disconnecting the Battery had the effect it did leads me to believe it's the relay. This is how faulty relays often manifest themselves. Hope this helps...
Happy Motoring!... Jim'99
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