Opel Astra 2013 Owner's Manual page 236

234 Vehicle care
Sidelights/Daytime running light (3)
1. Rotate the cap (3) anticlockwise
and remove it. Use the
screwdriver to rotate the cap.
2. Press latches together and
withdraw the bulb holder from the
reflector.
3. Remove the bulb from the socket
and replace the bulb.
4. Insert the bulb holder into the
reflector. Fit the cap and rotate
clockwise.
3-door hatchback
Bi-Halogen Headlight (1) with one
bulb for low and high beam.
Sidelight/Daytime running light (2).