Boot locking mechanism replacement / Repair

Before buying a new catch confirm that the wiring is sound in the boot hatch cable duct

What you will need........

New boot catch mechanism fiat part number #55702917

10mm spanner or socket set

PZ2 pozzi drive screw driver..

New lock

bit of grease for the threads if you have some..

Estimated time 10 -15 mins with odd slurp of tea..

remove the metal catch as you wont need this (press the little tab on the side of the lock to release it) (watch it as it fly out)


Lets get cracking...

First open the boot if it wont open see your handbook for the way to override the lock from inside the boot...

Once your in to the boot....

remove the 1x pozzi screw from in the grab handle


next remove the boot cover get your fingers between it and the boot and carefully work your way round releasing it from its plastic tit retaining clips...


And place cover to one side

Now you have exposed the lock as best you can take your 10 mm spanner and remove these 2 bolts

and withdraw lock inside the boot lid


Next unclip the cable...


refit new one in reverse order... (just ensure you put it in the correct way round ;) .. (y)

[BREAK=Lock repair]

So you have had the boot light stop working or message on the dash.. You might be able to repair this for a couple of quid :D

(Be aware that if you muck this up your boot catch will be unusable so check your local dealership is open and they have a boot catch on the shelf should the worst happen before you start

So first you have to get into it :D carefully unclip the clips try not to snap them although im sure you will the plastic is a bit brittle (Chemical metal or epoxi such as Aradite is your friend on reassembly :eek: )


Now withdraw the motor its held in place by 2 spring contacts to the Printed Circuit Board (PCB)

give it a wiggle and a pull and it will come away...


You could now try contact cleaner directly on to the micro switch.. if that fails replace it with a solding iron obviously

Now thats out its time to be brutal The way the lock is assembled should stop you removing the PCB (in theory) But well..........

Take a dremal and a milling bit or sanding drum or cutting disc and get trimming :devil:

you need to remove a bit of plastic from here...


like this take care not to damage the PCB


Now for the delicate hooliganism :devil: the last thing holding the PCB in place is a plastic tag which holds the Microswitch to the plastic body of the lock but insert a screw driver with care and give a bit of "persuasion"



you can see the snapped of plastic peg here...

and the part number for the microswitch which should be obtainable on line.. but first try soaking it in contact cleaner :cool:

Finally rebuilt this lock with a new switch soldered In place and packed the lock full of lithium grease to hopefully keep water out


old and new switch (switch cost me £1)


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New member
May 7, 2015
Glad I found this. Punto tailgate latch failed "open" as we were about to leave in another car for 600 mile trip. Had to back Punto tight against wall and fit wheel clamp for security while we were away.
Followed your instructions on return and managed to free sticky solenoid sufficiently to latch and lock tailgate.
New Fiat lock now on its way from Germany at half the price of second hand ones in UK.


New member
May 4, 2013
hi, my boot wont open after my other half slammed it shut...i changed fuse but it went straight away you think that replacing it would sort it out??


New member
Oct 18, 2012
Thanks for the guide. I've completed this job myself this weekend. My old lock was well corroded, so I replaced it with a new unit. Also needed to replace the fuse as it had blown.

For reference the fuse is a 15AMP in the dashboard fusebox. I have the glovebox fusebox and the fuse in number 6.


Well-known member
Nov 8, 2005
Are the non-genuine replacement locks worth anything, or do I have to get a "ricambi" one?