Opel INSIGNIA Owner's Manual page 236

234 Vehicle care
1. Rotate the cap anticlockwise and
remove it.
2. Rotate the bulb holder
anticlockwise to disengage.
Withdraw the bulb holder from the
reflector.
3. Disengage the bulb holder from
the plug connector by slightly
bending apart the retaining lug.
4. Replace the bulb and connect
with the plug.
5. Insert the bulb holder, engaging
the two lugs into the reflector and
rotate clockwise to secure.
6. Fit the cap and rotate clockwise.
Sidelight/Daytime running light
(2)
1. Rotate cap anticlockwise and
withdraw from the reflector.