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Ferrari 456M GTA Rear cigarette lighter fuse

Discussion in '456/550/575' started by nigelthomas1310, Jan 8, 2020.

  1. nigelthomas1310

    nigelthomas1310 Karting

    Jun 3, 2008
    59
    South Wales UK
    Full Name:
    Nigel Thomas
    Hi.

    I was running a tyre inflator off the rear cigarette lighter. It suddenly stopped. Pretty sure I have blown a fuse. Changed the one directly under in in the rubber fuse holder. No joy. I see the front lighter had it’s own fuse in the passenger footwell.
    Is there a ‘hidden’ fuse for the rear.
    Is it on a shared fuse but not documented on the fuse board.
    Any help appreciated.
    Thanks.
     
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  3. Qavion

    Qavion F1 Rookie
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    Feb 20, 2015
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    Ian Riddell
    #2 Qavion, Jan 8, 2020
    Last edited: Jan 8, 2020
    The circuit for this is bizarre. I traced it to the right inertia relay. Where it goes from here is unclear (I don't know what the internals of the relay are).

    There is at least one power line going into the inertia relay from the passenger footwell relay panel. However, this power circuit also feeds battery power to most of relay panel. There would be a lot more than a cigar lighter not working. Anyway, the relay panel is supplied with battery power from "maxi-fuses" in the engine bay (right hand side of car) under a black plastic cover. There is an 80 amp fuse and a 60 amp fuse (one of two). I doubt they are blown.

    Did you try to run the tyre inflator from the front cigar lighter? Or test the cigar lighter itself (if you have one). Are the cigar lighters (front and rear) interchangeable?

    (Irrelevant, but) The backlighting power for the rear cigar lighter also powers the rear number plate lights (as well as a lot of other things).
     
  4. Qavion

    Qavion F1 Rookie
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  5. tazandjan

    tazandjan Three Time F1 World Champ
    Lifetime Rossa Owner

    Jul 19, 2008
    33,046
    Clarksville, Tennessee
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    Terry H Phillips
    Ian- You get a whole lot more use out of that stuff than I do. I hate fiddling with electric circuits on cars.
     
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  6. Ros456GTA

    Ros456GTA Karting

    Dec 16, 2019
    68
    UK
    Full Name:
    Ros Tagard
    Sort of related.

    My rear ashtray latching mechanism is not working / broken.
    But for the life of me I can not find how to remove it
    I've taken out the center arm rest tray and unscrewed all the bits I could see, but I don't see have to get the thing out.

    Can anyone advise on how to get it out or how to fix/replace the latch.
     
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  8. killer58

    killer58 Formula 3

    Jun 30, 2010
    1,142
    CA & DC
    If it’s the same as mine, you must pull out the plastic insert. Under that, you should see a single screw that holds the tray in place.
     
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  9. Qavion

    Qavion F1 Rookie
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  10. nigelthomas1310

    nigelthomas1310 Karting

    Jun 3, 2008
    59
    South Wales UK
    Full Name:
    Nigel Thomas
    That’s really helpful info.
    Checked the inflator on the front lighter. It works fine. I have a charge cable for a phone I am now using as the tester. Works fine on the front.
    Rear still has the light on when the lights are powered.
    I will swap the actual lighter components to the front to establish if it’s the wiring / fuse or a component failure.
    It’s always an adventure with Italian electrics.

    I will post results once I have swapped all over
     
  11. Ros456GTA

    Ros456GTA Karting

    Dec 16, 2019
    68
    UK
    Full Name:
    Ros Tagard
    I found the center pin of the cigarette lighter socket to be a bit 'iffy', any chance that is the issue ?
     
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  13. nigelthomas1310

    nigelthomas1310 Karting

    Jun 3, 2008
    59
    South Wales UK
    Full Name:
    Nigel Thomas
    I have tried cleaning that and 'prying' a few clips etc...
    I will try it again and be a bit more 'forceful'....
    Thanks for the heads up!
     
  14. nigelthomas1310

    nigelthomas1310 Karting

    Jun 3, 2008
    59
    South Wales UK
    Full Name:
    Nigel Thomas
    This schematic shows a possible location of the items....

    https://www.eurospares.co.uk/parts/ferrari/456-gt-gta/interior/tunnel-upholstery-and-accessories-31339

    the fuse is definitely under the lighter in the back, I did not see a microswitch...
    I will post images later...
     
  15. Canuck550

    Canuck550 Formula Junior

    Sep 8, 2015
    462
    Incognito
    Full Name:
    RJA
    These Ferrari electrics are a bowl of pasta :)
    For this reason I never stress the system, I make an effort to inflate my tires using my daily drivers system, never use my fog lights etc, roll windows down one at a time etc......no faith in these electrics. Call me paranoid, however, has kept me out of trouble
    Hope you figure out this issue
    Pain in the rear
     
  16. Laserguru

    Laserguru Formula Junior
    Silver Subscribed Owner

    Aug 7, 2016
    970
    New Hampshire
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    Eric
    I'm a long time Alfa sufferer. Spiders, Berlina, GTVs. Once pulled over 30 ft of sagging wiring out from under a dash with absolutely no change in vehicle operations!! Seriously, can't make stuff like that up. All that preface having been said....

    Look for the little directional signs embedded in the system. Italian electrons have to be directed to know where to go. Otherwise they wander aimlessly of their own volition.

    Ian (Qavion), I bow to your tenacity and dedication to circuit diagrams. Like Taz, I find no intrinsic pleasure in chasing electrical gremlins. I'd even rather replace fuel pump seals and replace suspension bombs!! Which means I am clearly in the right model forum!
     
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  17. Qavion

    Qavion F1 Rookie
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    Any update on this, Nigel?
     
  18. nigelthomas1310

    nigelthomas1310 Karting

    Jun 3, 2008
    59
    South Wales UK
    Full Name:
    Nigel Thomas
    Hi.

    No further news. Still trying to find the power ‘break’
     
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