Thanks Steve. I may have found the offending component. The humming sound I heard was coming from a relay which I pulled and am researching to find the purpose. Going to the dealer in the morning for a replacement. If it's not it, they'll take it back. The part number is 201 821 00 47 or maybe 60 215 001. It's a twelve pin relay, about 3 1/2 x 2 x 1 inches. Will keep you posted.