[Eddles]

Had a look and checked the motor with a multimeter, and sure enough, it only works when I turn the steering wheel. I'm glad about this!

However, this makes me think of another question - what's the advantage of using an electric-hydraulic set-up over an all-electric system? Is it cheaper for GM just to stick on an electric motor in place of an engine driven mechanical pump rather than to redesign the whole system?

Woah, 0.5l/100km for hydraulic PAS - that's a big drain.

Thanks to all for your advice!