try pulling the battery on and leaving it unplugged for an hour then reconnect. I dont for 1 second suggest this is a solution, so people, don't flame me. However if light goes out never comes back, you may have just had a glitch of some kind. If it comes back immediately, you have a fault which is failing the SRS system check as soon as you turn the key. If it comes back while driving, you maybe have a sensor problem or a bag problem. In either case you do need to get a shop w w rovacom or testbook to diagnose the exact SRS error.
The pump running is almost certainly a pressure leak at the accumulator as people have pointed out. I have this problem on both my 4.6 and Classic. On the 4.6 its much less acute, but on the Classic pretty serious so as soon as i'm done making my other repairs it will go to shop to get new accumulator installed.... unless of course installing a new accumulator is straightforward and folks on this site can walk me through it.
Regarding the tire vibration - balance can do this. Also look at the tires -are they worn? Do you see a scallop pattern along the inside or outside edge? If so the suspension could be causing the tire problem which is in turn causing the vibration at speed. Suspension components which I directly know can cause this: shocks (caused this problem on my 4.6), suspension bushings (caused this problem on my wife's Mercedes). I'm sure this is just my limited experience and some other factors can also cause this problem.
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Pat Herman
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