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550 Dome/Door light issue

Discussion in '456/550/575' started by LP400S, Apr 18, 2016.

  1. LP400S

    LP400S Formula 3

    May 18, 2002
    1,221
    West Coast
    Does anyone know where the relay/control unit is located for this? The dome light works manually via switch just no lights on either door or dome light when you open the doors.
     
  2. philfrench

    philfrench Karting

    Jan 3, 2012
    101
    France
    When i switch alarm off on with the remote control box,at the opening the door dome light works.
    I think that the problem is with a relay working with the alarm
    I made a test of polarity with the door lights and it seems to be inversed.
    Gost?
     
  3. 166&456

    166&456 Formula 3

    Jul 13, 2010
    1,720
    Amsterdam
    Probable cause is oxidised contacts of the door jamb switches, happens pretty quickly in some environments. They can be cleaned and lubricated when removed. Do not unplug them unless you need to, the wire can fall into the door pillar, which will be bad for your mood.
     
  4. philfrench

    philfrench Karting

    Jan 3, 2012
    101
    France
    The b pillar switch is for the opening of the window when you open the door.
    One moment i thought it was easy like this..
     
  5. LP400S

    LP400S Formula 3

    May 18, 2002
    1,221
    West Coast
    Yes the switch in the door jamb is for the window. There is a switch in the latch on the door that controls the light. I find it hard to believe that both went bad at the same time.

    There has to be a control box or timer relay somewhere it is just not listed and it's what I am trying to locate if anyone knows.
     
  6. 166&456

    166&456 Formula 3

    Jul 13, 2010
    1,720
    Amsterdam
    On the 456 the switch that sits invisibly within the catch on the door is for the window, while the switch under the rubber "donut" in the jamb controls the dome light. I looked in the parts pictures and while I can find that dome light switch in the 456 pictures, I cannot find it for the 550. I am pretty sure the 550 should/would be the same, unless the Italians combined the dome light with the switch in the lock catch on the 550/575 family.
     
  7. philfrench

    philfrench Karting

    Jan 3, 2012
    101
    France

    For the 456M there is no switch on the door jamb for the dome light.
    For the 456 maybe it is like you say.
     

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