The noise you are hearing if it is a whirring sound it is possibly just the electro-hydraulic steering or as Sean said it could just be what in my car sounds like the fan speeding up.
Whenever the battery voltage gets low one of the first things that I have found to happen is the cruise control will just turn off. In my car it was the main fuse on top of the battery that failed and wouldn't allow the full charge to get through from the alternator. .
2001 Bora 4 Motion Sport now used by number two son
2011 Skoda Octavia Scout now with Underground Performance tune
2010 Jetta 125 tdi dsg for the misses - Impressed
2006 Polo GTI - Enhanced by some of Gav's magic - Absolutely loving it
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