Opel 2016 ASTRA Owner's Manual page 242

240 Vehicle care
2. Rotate the bulb holder
anticlockwise to disengage.
Withdraw the bulb holder from the
reflector.
3. Detach the bulb from the bulb
holder and replace the bulb.
4. Insert the bulb holder, engaging
the two lugs into the reflector and
rotate clockwise to secure.
5. Fit the cap and rotate clockwise.
High beam (2)
1. Rotate the cap (2) anticlockwise
and remove it.
2. Rotate the bulb holder
anticlockwise to disengage.
Withdraw the bulb holder from the
reflector.
3. Detach the bulb from the bulb
holder and replace the bulb.
4. Insert the bulb holder, engaging
the two lugs into the reflector and
rotate clockwise to secure.
5. Fit the cap and rotate clockwise.
Sidelights/Daytime running light (3)
1. Rotate the cap (3) anticlockwise
and remove it. Use the
screwdriver to rotate the cap.