Opel INSIGNIA 2017 Owner's Manual page 256

254 Vehicle care
2. Carefully withdraw tail light
assembly from recess and
remove. Take care that the cable
duct remains in position.
3. Turn the turn signal light bulb
socket anticlockwise and remove
it from the light assembly.
4. Detach the bulb from the bulb
socket and replace the turn signal
light bulb.
5. Attach the bulb socket to the light
assembly.
6. Attach the light assembly to the
vehicle body and tighten the
screws. Close covers.
Light assembly in the tailgate
1. Release the cover in the tailgate
and remove it.
2. Unscrew the plastic securing nut
by hand.