My ML320 had the first 3 lights from the left lid up on the dashboard and a loud buzzing sound is comming from under the windshield washer tank area. This buzzing is very loud even after turning off the engine - the car drives fine - will be taking it to the shop this morning - just wanted an opinion about what should I expect.

 

I believe you have your ABS pump stuck in the ON position. Go back few threads and you should find your answer. ABS relay or module fault. Pretty common problem.