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Electrical problems, need German (but: wiring diagram!)

Discussion in 'Microvans' started by anthill, Oct 12, 2010.

  1. anthill

    anthill Member

    OK, good news is I got a German electrical diagram for the Domingo. PM me if you want it.

    Bad news is I'm trying to troubleshoot what is (apparently) a common problem in Domingos: the rear window defrost and rear heater fan both run off a little "Motor fan control unit" box behind the glove box.

    Well, mine must have broken, cause I have no heat in the window and no fan in the heater.

    Apparently this is common, and easily fixable: A Czech guy here says "other [faulty] electronics might only control the rear window heater and rear heater fan. It is thanks to Karl, trivial defect which is easily correctable.".

    However Google Translate can't understand this german reviewer here who says "Keine Ahnung, aber davon jede Menge: Ein Steuerteil, über dem Handschuhfach, fürwasauchimmer, regelt wohl die heizbare Heckscheibe in Verbindung mit dem Fussheizunggebläuse im Fond(?). Nachdem ich auf der Platine alle Prozessor- und Speicherbauteile nachgelötet habe, (sahen schlecht verlötet aus) geht beides wieder.".

    So far I've got the fan controller out, but haven't figured out how its two relays work yet. Does the Sambar Van have a passenger compartment heater like this?


    EDIT:

    Never mind, the Germans have it #1 on their list of 'common problems'. Apparently the board needs resoldering. Should be easy.......?
     

    Attached Files:

    Last edited: Oct 12, 2010
  2. fupabox

    fupabox Active Member

    I have over the years rebuilt many control modules/relays that were way too expensive to replace from the dealership...in 99% of the cases the fix was to re-tin all the soldered connections on the circuit board.....it's just a matter of opening the case and using a soldering iron,you remelt all the solder connections...over the years the impurities in the solder (especially on older relays and circuit boards) react with oxygen and moisture in the air...their connection then builds resistance and can either overheat ,or not flow enough current to function properly....a magnifying glass can sometimes be used to spot pinholes or cracks in the original solder joints....the good thing is it's absolutely free to try and most of the time it works...:)


    BTW the rough translation of that sentance is......I resoldered the connections inside the control unit (located above the glovebox) which controls the heated rear window and the rear fan:):):):):)

    I should have read the edit before typing this:frustration::frustration:
     
    Last edited: Oct 12, 2010
  3. anthill

    anthill Member

    Hey fupa, thanks for the note anyhow... I didn't know you read German, awesome.

    Got a soldering iron today and reheated the heavy-gauge pins on the relay. It was obvious as soon as they heated up that the solder joint had cracked and oxidized... I had to add more flux and solder to get it to properly flow. Probably the right thing to do would have been to remove the solder and re-do the join, but whatever.

    It works! :D Rear heat and defrost in time for winter.

    [​IMG]

    [​IMG]
     
  4. KleinerMuck

    KleinerMuck New Member

    @anthill:
    Congrats that you solved this problem by re-soldering!
    I tried it the same way but my control modul still doesn't work. So I bought a "new" (of course) used one which I was told should work, but didn't. So I did re-solder this one as well, but unfortunately it still doesn't work. At least I did re-solder all solding points on both modules, but they still are dead.:frustration:

    @fupabox:
    Did you once replace the relay itselv?
    If so - where did you get the relay from?
     
  5. KleinerMuck

    KleinerMuck New Member

    So, in between I found a solution for my defect Fan Unit.
    I could replace the high power relay on the electrical board, and now everything works fine.
    Greets
    KleinerMuck
     

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