Here are some Instructions I knocked up years ago (it relates to pre-2005MY cars)
Instructions for changing the Litronic headlights from left to right dip (or vice-versa!)
You can use these to remove/replace the headlight units to change bulbs, just substitute swapping the bulbs for switching over the little switch!
Firstly, it IS best to look in the handbook the first time - much
easier to get yourself familiar with where everything is.
Here we go:
(From memory)
1. Open front boot
2. Get toolkit out from behind spare wheel
3. Find the little tool to take the headlights out. It is a tube
about 100mm long by, ohh, about 8mm diameter. It has a lever that
swivels at one end, and a hex socket moulded in to the other.
4. Undo the plastic screw retaining the top of the carpet on one side
of the boot (twist twist), and pull the carpet away (only a little,
in the area of the headlights).
5. Locate a little rubber plug in the inner wing - it is surrounded
by 3 rubber flaps, but sticks out from these.
6. Pull rubber plug out (twist and pull). Don't lose it!
7. Insert previously mentioned tool and fit onto the hex shaped
thingy in the wing.
8. Turn tool about 180 degrees from the horizontal, downwards and to the front
9. There will be an almighty bang! You will think "I've killed my
Boxster!", but don't worry it always does this - and is the light
housing unlatching.
10. Gently slide the housing out from the front of the car. Don't
scratch anything!
11. Part way out you will need to unlatch a wiring harness plug from
the headlight housing. (Litronics only).
12. Continue removing housing all the way out.
13. Put the housing down somewhere safe - I usually rest it indicator-
down on the boot floor (you need to get at the rear of the housing)
(Litronics only from this point to step 18)
14. Unlatch the rear of the housing, there is a little clip on one
side, and a matching latch on the other.
15. Pull rear of housing to one side (it has a harness attached if I
remember) and peek in the back.
16. It will not be obvious (it took me a few goes though this process
to remember where it was), but there is a little switch (more a metal
tab) that moves between two settings, O and T. Flick this switch with
a finger to the other setting than that it is already set to.
17. In the best Haynes Manual tradition, Assembly is the reverse of
the above...
Alright then, here's how to put it back together again...
First, fit the rear cover back on,
18. Slide the headlight housing back in to the wing, locating the
plastic guides in the runners.
19. Remember to re-attach the harness plug half way. (Litronics only)
Gently push housing home, and ensure it seats nicely with the rubber
gasket neatly seated. On the way in, ensure the litronic loom does not fall over the main connector and block it - this was a source of problems for me until I realised it was doing this occasionally
20. Turn the funny little tool the other way, BANG! as the housing
latches again!
21. Remove tool and (I usually forget!) replace the rubber plug in
the hole.
22. Place carpet back, tuck under sealing rubber and then push the
retaining screw back (no need to twist this time, it pushes on.
Repeat for other side.
Replace tool kit in spare wheel and replace wheel.
I don't bother putting the tool back in the tool kit as I do this so
much - I keep it in the glove box.
This takes far less time to do than it sounds, very easy
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