Opel 2016 ASTRA Owner's Manual page 48

46 Seats, restraints
Lumbar support
Adjust lumbar support using the four-
way switch to suit personal
requirements.
Moving support up and down: push
switch up or down.
Increasing and decreasing support:
push switch forwards or backwards.
Adjustable thigh support
Pull the lever and slide the thigh
support.
Side bolster, OPC version
Adjust seat width and backrest width
using the switches to suit personal
requirements.
Operate front rocker switch to change
seat width.
Operate rear rocker switch to change
backrest width.