Signum mirror not dimming (again)

Discussion in 'Signum' started by Bob Smith, Dec 31, 2007.

  1. Bob Smith

    Bob Smith Guest

    It's gone again - last time it was a fuse, but since I didn't change it, and
    it is not mentioned in the manual, I was wondering which fuse it is. I
    pulled a few out, but did not find a blown one. A few would not come out,
    so I would like to know if it is one of these before I put any major effort
    into removing it.

    Bob Smith, Dec 31, 2007
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  2. Bob Smith

    me140 Guest

    7.5 amp fuse in the fuse box in the boot - fuse number 27
    me140, Dec 31, 2007
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  3. Bob Smith

    Bob Smith Guest

    I will look tomorrow - the manual says fuse 27 is a 5A for the AC which is
    working ATM. Does it make any difference that it is a '53 2.0 DTI Signum?
    Fuse 28 is 7.5A, but again, I am sure the things listed in the manual are

    Bob Smith, Dec 31, 2007
  4. Bob Smith

    me140 Guest

    The wiring diagram says it is fuse 27 in the fuse box in the boot but they
    have been wrong before. If you can get to the mirror multi plug see if you
    have a 12v ignition feed to terminal 1.
    me140, Jan 1, 2008
  5. Bob Smith

    Bob Smith Guest

    Thanks, it was fuse 27 in the boot. Both the manual and actual fuse were
    5A. Replaced with a 5A, and everything is fine. If it blows again, should
    I put a 7.5A in?

    Bob Smith, Jan 15, 2008
  6. Bob Smith

    kellerman Guest

    Find out why it's blowing.
    kellerman, Jan 16, 2008
  7. Bob Smith

    Bob Smith Guest

    My thought is because they underspecced the fuse, since the current
    schematics say a 7.5A lives in slot 27 (but you snipped that bit). It went
    the first time after I had it 18 months, then a second time 3 months later.
    If it blew as soon as I replaced it I would think something was wrong.

    Bob Smith, Jan 18, 2008
  8. Bob Smith

    kellerman Guest

    The thing is that it blew. You need to find out why. If the correct
    answer is that the fuse should be 7.5A then by all means fit the correct
    fuse. If the fuse is blowing because of a fault in the dipping mirror or
    any other item connected to the fuse then (obviously) it needs to be
    repaired. The last thing you want is to discover that the fault causes a
    fire rather than just blowing a fuse to a relitavly unimportant (but
    handy) item.

    Sorry if it come over as "grandma and suck eggs" but the last thing I
    would want to see anybody loose their car (or worse) because of an
    aviodable fault.

    I've just checked the fuses in the boot of my Signum (04, 2.2DTi). Fuse
    27 is a 5A fuse. The manual says that fuse 27 is 7.5A and supplies the
    seat occupancy system(?), tyre pressure system, rain sensor and air
    con system. Plenty of scope there to look for faults! Any of those stop
    working if the fuse is out?

    You could try measuring the actual current consumption and monitor what
    happens when each item is used. If a 5A fuse is fitted then I would
    expect the current to be about 3A or so. If everything is working OK and
    the current is 5A then perhaps a 7.5A fuse should be fitted. Remember
    that these automotive fuses are slow blow fuses and intended to protect
    the wiring not so much the item connected to the fuse.
    See the link for the time current graphs.

    Waggle various wires, connectors etc to see if the current consumption
    suddenly jumps. Look for trapped of chaffing wire (particularly if there
    are any signs of bodywork repair). Put a 10A fuse in series with the
    meter when doing this - just in case!
    kellerman, Jan 18, 2008
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