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Boot locking mechanism replacement / Repair
Published by Andy Monty
12-12-2013
Difficulty Level: 2

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Difficulty Level: 2

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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

(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 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 )


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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...

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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

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

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like this take care not to damage the PCB

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Now for the delicate hooliganism 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"

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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




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


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old and new switch (switch cost me 1)
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Old 07-05-2015   #1
Join Date: May 2015
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Re: Boot locking mechanism replacement / Repair

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.
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Old 29-06-2017   #2
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Re: Boot locking mechanism replacement / Repair

hi, my boot wont open after my other half slammed it shut...i changed fuse but it went straight away ...do you think that replacing it would sort it out??
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Old 22-07-2017   #3
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Re: Boot locking mechanism replacement / Repair

fuse?..which fuse?..
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Old 14-01-2018   #4
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Re: Boot locking mechanism replacement / Repair

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.
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Old 04-03-2019   #5
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Re: Boot locking mechanism replacement / Repair

Are the non-genuine replacement locks worth anything, or do I have to get a "ricambi" one?
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