I have a 2000 ML 320 and I recently had the BAS Control Module replaced b/c of this same problem, BAS, ABS, ETS lights coming on. It was a horrifically expensive repair, $3400. About a week after the repair, the lights came back on. I returned to Mercedes and they couldn't figure it out and, of course, the codes wouldn't come on for them. Several weeks later it started to happen more frequently. I took it to a friend who is a Lexus mechanic with a lot of German car experience as well. I left it with him and the pump ran continuously for at least 6 hours. He took the temp with an infrared thermometer and it was running at 302 degrees hours after I stopped driving. I took it back to Mercedes today. They are saying that the relay or release switch (not sure what they said) is sticking so they are replacing the release switch. My concern is this - if this fixes the issue, my friend said that the entire module should be replaced b/c it ran hot for so long. Thoughts? I have already spent a fortune on this issue and I can't say that I have a lot of faith in the dealership right now. By the way, the Lexus mechanic fully supports your advice about finding a mechanic (if you are not mechanically inclined yourself) who is wiling to take out the module and send it off for repair first. He said often it is resolved with a little soldering. Errrrrr. Things I wish I knew several weeks ago. Thanks for your fantastic thread. I only wish I had found it months ago.