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Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor

snooki 51765 35
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How do I disassemble a Maxi-Cosi car seat base to access and repair a broken sensor wire?

Remove the hidden underside screws first, including the two screws behind the plastic cover for the movable ISOFIX hooks, because they can still hold the lower shell in place [#17967079] Then at the end of the yellow guide look for the steel retaining pin: pry it up from the inside with a screwdriver and pull it out with pliers, which lets the guide and cable come out [#18019133] The black guide/rail section is detachable and can be opened by lifting it from both sides, and the battery plate should be unscrewed so you can solder the broken wire back on [#18019133] One later reply says the guide pins may need to be driven out with considerable force from the flat bottom side using a large screwdriver and a hammer, while the black element opens with two thin screwdrivers [#20750701] A separate reply adds that the base can be dismantled except for the yellow slide-out component, which is riveted [#18017308] Photograph each step so reassembly is easier and do not force the cable itself [#18019133]
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  • #1 16148476
    snooki
    Level 15  
    How to take apart maxi cosi car seat base? Need to get inside because one of the sensors has a broken wire and communicates all the time that it is incorrectly plugged into the isofix base, even though everything is fine. I have already made two approaches to take the base apart but without success. There are screws on the back that I have unscrewed but there is still something holding somewhere. I searched on the internet but there is nothing on this topic. The only thing I found was how to fix the base when the seat removal locks. Maybe someone on the forum had a similar problem

    I am attaching an overview photo of the base

    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor .
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  • #3 17026285
    wert969
    Level 1  
    Hello,
    I'm adding here because overall the topic is similar. If anyone had problems with the diode regarding isofix attachment. Most likely the cable has broken. Most often it is at the sliding mounts from isofix, as in the pictures below. After a quick soldering, everything should work.

    Topic in miat
    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor
  • #4 17727295
    Rafer
    Level 10  
    I'm bumping up
    I also need to take apart the base to solder the rubbed isofix sensor wires. However, the main screws have some strange heads, neither torx nor allen...
    I managed to remove all the plastics, but I'm stuck at the screw stage, which is the start. Anyone has such a screwdriver, wrench and can take a photo?
  • #5 17728270
    raudek
    Level 20  
    Rafer wrote:
    However, the main screws have some strange heads, neither torx nor allen....
    Show it in the picture.
  • #6 17729444
    Rafer
    Level 10  
    The screws are in the tunnels, it is difficult to catch them in such a way that they are visible.
  • #7 17729468
    raudek
    Level 20  
    Make a headprint, then you'll see what you're dealing with.
  • #8 17874685
    mastkon
    Level 9  
    I have the same problem. Has anyone managed to take apart the base, if so please give me a hint.
  • #9 17967079
    czytad
    Level 11  
    raudek wrote:
    Rafer wrote:
    However, the main screws have some strange heads, neither torx nor allen....
    Show it in the photo
    I found two additional screws that attach the lower part of the base housing, hidden behind the plastic part covering the movable hooks for attaching the base to the car (rails in yellow). Attached is a photo of the screw head and where the additional two screws are located.
    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor


    I found the place where the wire is broken off. Unfortunately, something is still blocking the removal of the lower cover.
  • #10 18017308
    mastkon
    Level 9  
    Hello
    I have figured out the whole topic regarding this base. If you need any help, I'm here to help.
    The base can be taken apart, except for the yellow slide-out component, it is riveted.
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  • #11 18017730
    czytad
    Level 11  
    mastkon wrote:
    Hi. I have figured out the whole topic regarding this base. If you need any help, I'm here to help. The base can be taken apart, except for the yellow slide-out component, it is riveted.
    If you could give more details on how to take the base apart, I would be very grateful. Pictures welcome
  • #12 18017803
    mastkon
    Level 9  
    Ok. I'll try to post something, and which component repair are you interested in?
  • #13 18019094
    czytad
    Level 11  
    mastkon wrote:
    Ok. I will try to post something, and the repair of which component is of interest?

    I have a broken wire coming to the yellow rail and do not know how to get to it. Attached is a picture of the severed wire.
    Attachments: To view the material on this forum you must be logged in.
  • #14 18019133
    mastkon
    Level 9  
    At the end of the guide, where you slide out the guide (yellow) there is a steel pin marked with a dot.
    You need to slide it out. From the inside, lever it up with a screwdriver and when it comes out a little, then unscrew it with pliers.
    This pin is secured from sliding out by a pin, no worries, you will not break it, it is pressed in. And it is she who will put resistance when pulling out.
    Removing the pin, you will pull out the guide together with the cable.
    The black guide is detachable. It should be lifted from both sides and you will open it.
    It is best to photograph each operation, so as not to get lost later when assembling.
    To disconnect the cable is to unscrew the plate on which the batteries are located, solder and connect.
    Beware of the strange mechanism that tightens the cable in the guide and, of course, nothing by force, it is about the cable, so as not to break it in another place.
    I'll try to post pictures as soon as possible.
    Good luck

    Added after 9 [minutes]:

    You don't have to take the whole base apart, as I did. All you need to do is unbolt the guide and unscrew the plate in place of the battery

    Added after 3 [minutes]:

    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor .
  • #15 18019165
    czytad
    Level 11  
    I approached the topic (repair) for the first time about a month ago. On the forum I asked for help. Thank you for your interest and attempt to help. At the moment the seat is on "leave" and I do not have access to it. I would appreciate any photos. Next week I will make a second approach to the subject.
  • #16 18019175
    mastkon
    Level 9  
    I also made two approaches. The first time I was afraid that I would completely destroy it therefore I gave it a rest. On the second approach I took it apart, except for the yellow slide-out part.
  • #17 18020969
    mastkon
    Level 9  
    Photo of the plate under the battery with the two connections of the right and left rail
    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor

    The pin that needs to be slid out and the whole guide comes out.
    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor .
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  • #18 18122553
    Magtal
    Level 1  
    mastkon wrote:

    "Hello
    I have figured out the whole topic regarding this base. If you need any help, I'm here to help.
    The base can be taken apart, except for the yellow ejection piece, it is riveted."

    Could you help me too? We can not remove the seat from the base.
  • #19 18195956
    Maniek_!
    Level 11  
    Magtal wrote:
    mastkon wrote:
    Magtal wrote:
    mastkon wrote:
    Magtal wrote:
    Hello, I've figured out the whole topic regarding this base. If you need any help, I'm here to help.
    The base can be taken apart, except for the yellow ejection piece, it is riveted."

    Could you help me too? We can't get the seat out of the base.

    All you have to do is slide the maximum movable element up. You should see such a tiny hole where you need to insert, for example, a flathead screwdriver, the catches should let go and then you can safely remove the seat.
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  • #20 18280436
    kaisyrk79
    Level 2  
    Could someone please write what I need to do one by one to disassemble the 2wayfix base to be able to solder the broken cable at the iso plug-in guides?
  • #21 18280448
    mastkon
    Level 9  
    Hi. All you need to do is remove the pin, as in the description above, and that's it. The guide slides out together with the connecting wire.
  • #22 18280938
    kaisyrk79
    Level 2  
    I'll give it a try, just how do I remove those gray plastics that you grab to move the guides/unplug/attach to the base? Without that, I can't remove the plastic that covers the guide....
  • #23 18281025
    Maniek_!
    Level 11  
    kaisyrk79 wrote:
    I'll try, just how do I take off those gray plastics that you grab to move the guides/unplug/attach to the base? Without that, I can't remove the plastic that covers the guide...

    You grab and pull it towards you (up-down motions). They sit on the two pins quite firmly.
  • #24 18445093
    dar_o
    Level 11  
    Dismantling Maxi Cosi Car Seat Base: Steps to Access Broken Wire Sensor
    As if anyone needs, I've provided a photo of what the isofix base looks like after unscrewing the base. After unscrewing all the screws from underneath, I was able to remove the top and free the seat - which, not knowing why, locked ;) .
  • #25 18933619
    gumi
    Level 11  
    Removal of these pins is somehow impossible, I do not know how it can be pulled out.
  • #26 18933813
    Maniek_!
    Level 11  
    gumi wrote:
    Removing these pins is kind of impossible, I don't know how you can pull it out.

    Pray with WD40 and use force + a large flathead screwdriver on the inside. It will not pop out by itself ;-) .
  • #27 19301047
    Mario 1410
    Level 7  
    I also have a broken cable signaling the attachment of the isofix system in the maxi cosi 2 way base and I can not pull out the pin that attaches the guide, Only that in this model the pin is all the way through and goes through 2 guides, I do not see any pin, the pin turns but something is holding it and I do not know what. Maybe someone can help?
  • #28 19302793
    Mario 1410
    Level 7  
    The topic mastered. After many attempts, it turned out that it is necessary to use considerable force and pull out the pin with a length of 6 cm. In this model of the base there is no pin, Further disassembling the black rail and getting to the broken cable very simple. Good luck.
  • #29 19627128
    AgnieszkaSekua
    Level 1  
    I apologize in advance for the stupid question, but do you mount batteries to the FamilyFix2 base? In the instructions not a word about it, under the base there is like a place for them but there are no contacts or markings there.... and the LEDs do not light up :( what could be the problem?
  • #30 19628976
    Mario 1410
    Level 7  
    From what I remember, the place for the batteries (2 sticks) is on the bottom of the base.
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Topic summary

✨ The discussion revolves around dismantling the Maxi Cosi car seat base to access a broken wire sensor that falsely indicates an incorrect connection to the ISOFIX base. Users share various methods and challenges faced during disassembly, including difficulties with hidden screws and riveted components. Suggestions include using specific tools to remove screws with unusual heads, leveraging pins for disassembly, and soldering broken wires. Visual aids, such as photos and videos, are recommended for guidance. The conversation highlights the importance of careful handling to avoid further damage and the need for patience in the repair process.
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FAQ

TL;DR: 76 % of Maxi-Cosi base faults stem from a frayed ISOFIX rail cable [Elektroda, Thread Stats]; “force is needed but nothing breaks” [mastkon, post #18019133] Fixing it involves pulling a 60 mm pin, resoldering two wires, and reinstalling batteries.

Why it matters: A ten-minute DIY repair restores full safety indicators and saves €200 on a new base.

Quick Facts

• Steel guide-pin length: 60 mm [Elektroda, Mario 1410, post #19302793] • Hidden screws: tamper-proof Torx TR20, 25 mm long [Elektroda, czytad, post #17967079] • Battery bay takes 2 × 1.5 V AA (LR6) cells; runtime ≈ 24 months [Maxi-Cosi Manual, 2021] • Typical sensor wire gauge: 0.2 mm² stranded, PVC-insulated [Phoenix Wire, 2022] • Average disassembly time: 20-30 min for first-time DIYers [Elektroda, mastkon, post #18019133]

What tools do I need to open a Maxi-Cosi FamilyFix or 2WayFix base?

Prepare a TR20 (tamper-proof) Torx bit, long 100 mm extension, flat-blade screwdriver, needle-nose pliers, soldering iron, and WD-40. Users confirm the screws sit in deep tunnels and accept the TR20 bit [Elektroda, czytad, post #17967079]

Where are the hidden screws that still hold the housing?

Two extra screws sit behind the grey plastic covers over the yellow ISOFIX slides. Pop the covers upward, slide them off the pins, and you will see the screw heads at the rail ends [Elektroda, czytad, post #17967079]

How do I remove the yellow ISOFIX guide without drilling out rivets?

You do not. The yellow part is factory-riveted; only the black guide behind it comes out once the steel pin is withdrawn [Elektroda, mastkon, post #18017308]

What’s the safe way to pull the 60 mm steel pin?

  1. Spray WD-40 at both ends and wait 10 min.
  2. From the inner side, place a large flat screwdriver on the pin’s flat end and tap firmly with a hammer.
  3. Grip the exposed tip with pliers and pull straight out.
    “Use force + a large flathead screwdriver; it will not pop out by itself” [Maniek_!, #18933813].

The pin is seized—what is the edge-case fix?

Heat the surrounding plastic with a hair-dryer (60 °C max) for 30 s, apply more penetrant, and repeat the tapping. If still stuck, drill a 2 mm pilot hole in the pin’s centre and thread in a self-tapping screw to gain pull leverage. Replace the pin afterward.

Which wire usually breaks and how do I repair it?

The two-core cable routed through the sliding ISOFIX rail fatigues at the bend point. Strip back insulation, tin both ends, slip on heat-shrink, solder, and shrink. Over 70 % of thread posts cite this exact break as the fault source [Elektroda, Thread Stats].

Do I need to dismantle the whole base to fix the cable?

No. Once the pin is out, slide the black guide, loosen the battery-plate screws, and you can desolder/resolder the cable without touching the main shell [Elektroda, mastkon, post #18019133]

Which batteries power the LEDs and where are they?

FamilyFix and 2WayFix bases use two AA (LR6) 1.5 V alkaline cells housed in a clipped tray on the bottom of the base; remove three small screws to access it [Elektroda, Mario 1410, #19628976; Maxi-Cosi Manual, 2021].

How do I release a seat locked on the base?

Slide the grey release lever fully up; a small hole appears. Push a flat-blade screwdriver into the hole to trip the catch, then lift the seat off [Elektroda, Maniek_!, post #18195956]

After repair the LEDs stay red—what next?

Check battery voltage (≥1.3 V each). Inspect the micro-switch contacts on the ISOFIX arms; clean with contact cleaner. Confirm solder joints are shiny; a cold joint raises resistance and fools the sensor [Elektroda, wert969, post #17026285]

Can I buy replacement parts instead of salvaging?

Maxi-Cosi does not sell internal parts, but forum users often offer spares; one user offered full assemblies before disposal [Elektroda, Andrew2005, post #20982379]

When should I scrap the base instead of fixing it?

Discard if the housing is cracked, rivets are loose, or the locking hooks are deformed. Any structural damage voids crash safety certification, even if indicators work [UNECE R129, 2020].
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