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  #1  
Old 10-28-2002, 08:11 PM
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Location: LEMONT-CHICAGO
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190E Windscreen washer pump

My windscreen washer pump stopped working on my 1990 190E 2.6. The pump works if I jump direct battery juice to it. so its not the pump, So it is in the wiring, relay or switch. The wiring is buried and I don't have a clue where the relay is located. Any suggestions in my approach to this problem would be appreciated.
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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  #2  
Old 10-29-2002, 10:07 AM
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The largest relay in the fuse box is the combination relay & operates the pump. Check to see if this relay(module) clicks when operating the switch.
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  #3  
Old 12-19-2002, 03:43 PM
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Location: Piedmont, OK
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Same issue on 124 ('90 300CE)

I have the same issue but on a 1990 300 CE - The pump is good, but not getting juice. How is the troubleshooting different on this model?

Thanks!
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  #4  
Old 12-20-2002, 01:31 AM
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I first tested the pump by directing two jumper wires from the battery to see if the pump motor would work. I next tried jumping the terminal with the brown wire to ground while someone operated the switch, and the pump would not operate. I tested for voltage at the violet wire with the yellow stripe when the switch was operated. No voltage was observed. I went and bought a new relay and it still would not work but I got power to the violet wire with the yellow stripe. I jumped a groung to the brown wire to the battery and it finally was fixed. The brown wire had high resistance and may have helped the fry the relay.
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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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  #5  
Old 12-20-2002, 10:44 AM
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Join Date: Dec 2002
Location: Piedmont, OK
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Can anyone comment on whether the circuit is similar in the 124 chassis? (1990 300CE in this case) I need to troubleshoot mine this week and, like I said, the motor turns when connected to 12v, but no power at the connector.
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  #6  
Old 12-20-2002, 01:56 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The W124 chassis has the same system as the W201(190) chassis. The combination relay is the second largest relay in the REAR section of the fuse box.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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