Vauxhall Astra GTC Owner's Manual page 29

28 Keys, doors and windows
In position 0 no mirror is selected.
Folding
For pedestrian safety, the exterior
mirrors will swing out of their normal
mounting position if they are struck
with sufficient force. Reposition the
mirror by applying slight pressure to
the mirror housing.
Electric folding
Turn control to 0, then push the
control down. Both exterior mirrors
will fold.
Push the control down again - both
exterior mirrors return to their original
position.
If an electrically folded mirror is
manually extended, pressing down
the control will only electrically extend
the other mirror.
Heated
Operated by pressing the Ü button.
Heating works with the engine
running and is switched off
automatically after a short time.