Hi Simon,
With my GS, if the battery is disconnected I need to reset my sunroof and Mirrors, easily done by putting them through a full cycle.
With Sunroof hold down the open button and alow the roof to go thro a full cycle.
With the wing mirrors, up, right, down, left....both sides.
This puts everything back as it should be,,,,,Merry Xmas, Tony.