Rear defroster malfunction? - Mercedes-Benz Forum
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#1 (permalink) Old 11-25-2007, 12:50 AM
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Rear defroster malfunction?

Wire Diagram, and Theory of Operation Needed Requested.

Grandsons first car it's been a money pit for him... but he still wants to keep it. he's not a DIYer but willing

anyway his defroster has the flowing problem, presses the rocker switch to the right no light illuminates as it should telling combo relay to activate the heater grid on the glass for a predetermined amount of time.

we removed switch (bonding i guess) on dash center vent outlets and had it tested by his friend witch also has the W201 but different year grandsons is 1993 friends is 1990 switch is good we tryed his but still have no results.

All fuses where replaced by the dealer as well as control unit below the fan control swich, now that hit him hard in the seat of his wallet, hence why we join you now looking get some Needed help.. components of this system consist of switch,..? and thats all we know thus far.

All input is greatly Appreciated:

Maxx

Last edited by Mr.Maxx; 11-25-2007 at 12:10 PM. Reason: Bad Spelling i think
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#2 (permalink) Old 11-25-2007, 08:16 AM
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Fuse, switch, combination relay, wiring, heater elements on the rear window.
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#3 (permalink) Old 11-25-2007, 09:23 AM
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search, there are wiring diagrams etc all over the board. search under my post or stefans post. i went through this before and it turns out that i need a new rear window, so i just deal with it.


1993 MB 190E 2.3 105k- its alive.. 1996 Volvo 855 GLT-R 350k still rolling
1998 Subaru Outback SUS 210k- Daily Driver 2011 Toyota Camry XLE 36k
1991 BMW 525I stock as stock gets 98k (Wrecked) 1998 MB C230 209k possessed by the devil
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#4 (permalink) Old 11-25-2007, 12:01 PM
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search, there are wiring diagrams etc all over the board. search under my post or stefans post. i went through this before and it turns out that i need a new rear window, so i just deal with it.
So your thinking that in short we are wasting time witch is money no matter whos time it is without tracking down what is causing this to not function?



Maxx
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#5 (permalink) Old 11-25-2007, 12:04 PM
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Originally Posted by shingleback View Post
Fuse, switch, combination relay, wiring, heater elements on the rear window.

thanks for your input.



Maxx
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#6 (permalink) Old 11-25-2007, 05:14 PM
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You're welcome.

If you check the rear window element with an ohmmeter and find that there is an open circuit, find the break and bridge it with some of the 'paint' in any standard rear defroster repair kit. You may get lucky and repair the problem this way if there is a break in the element and you find it. The ohmmeter is a great tool for this, or at least for ruling the window element out of the 'defective part' list.
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#7 (permalink) Old 11-25-2007, 06:51 PM
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You're welcome.

If you check the rear window element with an ohmmeter and find that there is an open circuit, find the break and bridge it with some of the 'paint' in any standard rear defroster repair kit. You may get lucky and repair the problem this way if there is a break in the element and you find it. The ohmmeter is a great tool for this, or at least for ruling the window element out of the 'defective part' list.
now thats a start thank you shingleback.

Time Consuming but all test thus far on rear glass grid as they should be.
could the Total resistances of the grid be substituted buy resister to trick the control relay to turn on, no ?
just an idea but seems logical.

__________________________________
Maxx
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#8 (permalink) Old 11-25-2007, 06:54 PM
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Quote:
Originally Posted by Mr.Maxx View Post
So your thinking that in short we are wasting time witch is money no matter whos time it is without tracking down what is causing this to not function?



Maxx
check the resistance of the back window. if you have the time, its worth doing. my window was tinted so i just left it. if u search under my name u will find the post that stefan posted a diagram for the defog system. i dont have time to mess with it since i have school and all. have fun.


1993 MB 190E 2.3 105k- its alive.. 1996 Volvo 855 GLT-R 350k still rolling
1998 Subaru Outback SUS 210k- Daily Driver 2011 Toyota Camry XLE 36k
1991 BMW 525I stock as stock gets 98k (Wrecked) 1998 MB C230 209k possessed by the devil
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#9 (permalink) Old 11-25-2007, 07:40 PM
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Thank You, Jippi understood about your Schooling very Important. hard work will Always pay off.


_________________________________________
Maxx

Last edited by Mr.Maxx; 11-25-2007 at 07:43 PM.
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#10 (permalink) Old 11-25-2007, 10:23 PM
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