Question about 2004 Mercedes-Benz C-Class

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Mercedes ML500 windshield washer doesn't work

Mercedes ML500 washer tank was leaking, removed it and found that the second pump (for rear washer/wiper) was actually what was leaking through its housing. Disconnected and removed it and temporarily plugged hole. Now the tank holds fluid again and "low fluid" light on dash is out, but front windshield washer doesn't work. I put a meter on the connector to that pump and read no voltage when "wash" lever is activated. Only thing I can think of is that this car is smart enough to detect the open circuit on the disconnected second pump and shut the whole system down. Could this be true?

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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freetek
  • 5568 Answers

SOURCE: Broken windshield wiper motor in 1990 Mercedes E300

If this MB is built like others I have known, this is going to be a chore. Some models required the removal of the dashboard to replacement the wiper motor. I recall hearing from a frustrated owner (former brother-in-law) that the dealer-estimated labor time was 5 hours.
I wanted to refer you to Chilton or Haynes for an aftermarket manual but surprisingly, neither of them offer one covering your 1990 year. 

Posted on Jan 29, 2009

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lastech
  • 408 Answers

SOURCE: '94 Mercedes-Benz S320 Windshield wiper will

hello,have you check your wiper relay located on top of main fuse box,maybe poor contact,or your combination switch for wiper have worn-out mechanism,or your wiper motor need tobe check the condition,ty

Posted on May 03, 2009

  • 58 Answers

SOURCE: Windshield wiper fluid won't squirt

When you pull the lever to activate the windshield washers, do you hear any type of sound coming from under the hood?  A whirring sound should be heard from the little electric pump that feds the washers.
If you can hear the whir, then you should look for a possible clog in the washer hoses (there is more than one...).
If you cannot hear the whirr, then you should check the fuse that protects the windshield washer circuit.  Check your owner's manual for the location and correct amperage for this circuit.
Good luck!

Posted on Jun 16, 2009

  • 5 Answers

SOURCE: Mercedes c230 windshield wiper starts on its own

Car has rain sensing windshield.Most likely you have the wiper on/off level in the intermittent position,which turns on the sensor. When the sensor detects moisture or even dust sometimes. It turns on wipers. Just make sure the wipers are off and not in the intermittent position.

Posted on Jun 17, 2009

  • 55 Answers

SOURCE: The windshield wipers on my 2004 mercedes e320

It sounds like you have what is known as a short to power. I would suggest having an automotive electrician/technician take a look at the electrical wiring and your switches. I believe it may be inside your turn signal switch. It sure sounds like many issues Ive seen over the years and the switch was the culprit. Good luck.

Posted on Aug 24, 2009

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1 Answer

In my 2007 Saturn Vue there is what I think is an air pump which is cracked that one port is not connected to anything.


There is a electric motor that pumps washer fluid . Located in the bottom of the washer fluid tank .
Wash Operation (Front and Rear Wipers)
The front and rear washer systems use the same windshield washer fluid pump. When either the front or rear wiper is in the washer position voltage will be supplied to one side of the windshield washer fluid pump (depending on whether it is front or rear), while the other side of the pump is grounded.
At this point, the windshield washer fluid pump sprays solvent onto the windshield. When the front or rear washer is activated, the BCM receives an input from the switch that is activated. The BCM will control the wipers while in the WASH mode. The BCM will control either the front wiper relay or the rear wiper relay to turn on the wipers. The windshield wipers operate at low speed for 3 swipes and returns to the park position.

When turning on the washers do you hear the motor run ? Have some one try it while you listen at the washer fluid tank ! These pump motors do go bad .
turn OFF the ignition.
Disconnect the harness electrical connector of the windshield washer fluid pump.
Connect a test lamp from the windshield washer pump control circuit to a good ground .
Turn ON the ignition, with the engine OFF.
Press the front washer switch.
Does the test lamp illuminate?
YES or NO !

Nov 18, 2016 | Saturn Cars & Trucks

1 Answer

I HAVE ML500 MERCEDES BENZ 2006. THE CAR CRANK WELL BUT DOES NOT START, I CHANGE FUEL PUMP, FUEL FILTER, CRANK SENSOR, SPARK PLUG AND MASS AIR FLOW. BUT THE CAR IS SAME PROBLEM.. WHAT IS THE POSSIBL


does this car have a timing belt on it did it break , open the air box spray a little ether in it should start ,do not disconnect anything just do this , get back ,

Sep 15, 2014 | 2007 Mercedes-Benz ML500

1 Answer

How to stop water leak under driver dashboard of 2002 ml500 mercedes


Try unplugging drains for sun roof if it has one or the drains under the hood up against the firewall and hinges fro the top and bottom of the front fenders.

Apr 30, 2014 | Mercedes-Benz ML320 Cars & Trucks

2 Answers

My windshield washer does not work


HOOK TEST LIGHT TO WASHER PUMP MOTOR ELECTRICAL CONNECTOR FIRST DISCONNECT ELECTRICAL AT WASHER PUMP MOTOR.NEED A HELP TO WORK WIPER WASHER SWITCH.IF TEST LIGHT LIGHT UP WIPER WASHER MOTOR FAULTY.IF TEST LIGHT DONT WORK.YOU HAVE FAULTY WIPER WASHER SWITCH OR FAULT IN THE WASHER WIPER POWER MODULE IF WIPER MOTOR NOT WORKING YOU HAVE A BLOWED 30 AMP FUSE OR BAD WIPER MOTOR RELAY.

May 22, 2011 | 2006 Dodge Grand Caravan

1 Answer

I need to know where to put the fluid for the rear wipers.


The same tank that holds the front wiper washer fluid holds the rear. If your rear washer is not working, it could be one of 2 things.....

1- your washer fluid tank is low. Most car manufacturers design the tank so the rear washers stop getting fluid first to remind you to fill the tank.

2- there is a clog in your rear washer system or the pump is not working. Your problem sounds like your pump is working, so first top off your washer fluid tank, then if after about 30 seconds of trying (it takes a while to get back there), try to first unplug the rear washer by scrubbing with a toothbrush and hot water. Next, follow the hose to see if it is pinched somewhere or broken.

Feb 19, 2011 | Chevrolet Aveo Cars & Trucks

1 Answer

Headlight washer system leaks out all the fluid just sitting without using the pump button


first check where it's leaking from, if water dropping near front wheel it's leaking from tank first check the rubber grommet for both washer motor 1 wiper washer motor and 2 head light washer motor, both are in the water tank, if your car water dropping from front end under the front bumper it should leaking from washer nozzle in this case need to replace the head light washer nozzle. some time leaking from hose if you check from underneath you can see where it's leaking from,

Nov 20, 2010 | 2000 Mercedes-Benz S-Class

1 Answer

Rear window washer-no fluid


You may have a line disconnected or the tank may be emply? Are all lines connected at the rear blade? I believe the fluid comes from the front tank under the hood. Check the lines from the tank.
Also check the pump. Can you hear the pump when using rear wiper/washer?

Aug 18, 2009 | 2000 Dodge Caravan

3 Answers

LOCATE FUEL FILTER ON 92' MERCEDES 300E


There is an in tank fuel screen where the fuel feed line screws into the bottom of the fuel tank. The is also a convertional fuel filter which is located just in front of the rear wheel on left or right side depending on model. I have a wagon and mine is on the right side. There is a plastic panel that you need to remove with a 10mm socket and a long extention. There are three screws to remove before you can get to the fuel pump/fuel filter area.

May 28, 2009 | 1992 Mercedes-Benz Mercedes Benz 300 Class

1 Answer

99 Nissan Quest real wiper runs continually when ignition is on


Principles of Operation
Operation of the windshield wiper and washer is controlled by the front wiper/washer amplifier assembly. The front wiper/washer amplifier input comes from the multifunction switch by means of a voltage divider circuit. A constant voltage is applied to the multifunction switch by the front wiper/washer amplifier. When the multifunction switch is moved into the LO, HI, or intermittent position, the voltage is directed through a series of resistors. This results in various voltages being returned to the module for each switch position. The module then grounds the appropriate circuit, based on the voltage signal received back from the multifunction switch. This causes the wipers to run intermittently, or at the appropriate speed. Voltage is supplied to the wiper motor by the CJB fuse F46 (20A).
When the multifunction switch wash button is depressed, it bypasses all of the resistors returning a full voltage signal to the module. The module then grounds the appropriate circuits to operate the windshield washer pump for as long as the switch is depressed. The windshield wiper speed is dependent on the position of the windshield wiper/washer switch.
Voltage for the windshield washer pump is also provided by CJB fuse F46 (20A).
Operation of the rear wiper and washer is controlled by the rear wiper/washer switch.
Voltage is supplied to the rear window wiper motor by the fuse junction panel fuse F44 (10A).
The rear window wiper motor ground is made or broken by the rear wiper/washer switch. When the rear wiper/washer switch is moved into the WIPER position, it grounds the rear window wiper motor circuit, causing the rear window wiper motor to run once every 10-15 seconds.
Voltage to the rear washer pump motor is also supplied by the CJB fuse F44 (10A). The rear washer pump is directly controlled by the rear wiper/washer switch which makes or breaks the ground for the washer pump motor, depending upon its position.
If the vehicle is equipped with a movable liftgate glass, a liftgate glass switch is utilized to prevent rear window wiper operation when the liftgate glass is open. This same switch also causes the rear window wiper to drop down approximately three inches when the liftgate glass latch is released.
------------------------------------------------------------------------------------------
  • The wipers stay on continuously — rear wiper
  • Circuit.
  • Rear wiper/washer switch.
  • GO to Pinpoint Test L .


---------------------------------------------------------------------------------------------
Measure the resistance between rear wiper/washer switch C288 pin 6, component side and rear wiper/washer switch C288 pin 2, component side.
  • Is the resistance less than 5 ohms with the switch depressed, and greater than 10,000 ohms with it released?
sxv~us~en~file=arrow.gif~gen~ref.gifYes GO to L2 .
sxv~us~en~file=arrow.gif~gen~ref.gifNo INSTALL a new rear wiper/washer switch. TEST the system for normal operation.

Measure the resistance between rear wiper/washer switch C288 pin 6, circuit WB08 (BU/YE), harness side and ground.
  • Is the resistance greater than 10,000 ohms?
sxv~us~en~file=arrow.gif~gen~ref.gifYes INSTALL a new rear wiper /washer switch. TEST the system for normal operation.
sxv~us~en~file=arrow.gif~gen~ref.gifNo REPAIR circuit WB08 (BU/YE). TEST the system for normal operation.

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Dec 08, 2008 | 1999 Nissan Quest

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