Check which of the bulbs is defective.
Switch off the ignition and the lights.
Open the boot lid.
Take the screwdriver out of the vehicle tool kit Link.
Use the flat-blade side of the reversible screwdriver insert and carefully lever off the appropriate covers Fig. 1.
Take the bulb holder for the defective bulb (turn signal -A- or inner/outer brake light/tail light -B- Fig. 2) out of the light unit Link.
Change the bulb Link.
Re-install all the parts in the reverse sequence.
Check that the bulb functions correctly.
Note
It is easier to take out the bulb holder if you use the tool* that is attached to the inside of the cover.