There's leakage from the bottom of wash pump. I plan to replace it by myself. Is there any tricky? Looks like all I need is to unplug the wire and replace the pump on hand. Thanks in advance. Oh, my car is a 2000 330i E46.
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Re: howto change wash pump for windshield wiper sys
Hi my name is Allen!
The pump is held in by a rubber crommet, just pull it straight out, but when going back in lube the rubber with WD40 or any kind of lubricant, this will help with installation without damaging the rubber.
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The Wiper/Washer System consists of the following components:
• Windshield wiper/washer switch
• Body control module (BCM)
• Wiper micro relay
• Wiper 2 relay
• Wiper diode
• Windshield wiper motor
• Windshield washer pump
• Windshield washer nozzles
• Windshield washer solvent container
• Windshield wiper arm and blade assemblies
• Windshield wiper transmission
• WIP/WASH 10A fuse
• WIPER 25A fuse
Wiper/Washer System Description
The body control module (BCM) controls wiper motor low speed operation. The washer pump and high speed operation are controlled directly by the wiper/washer switch. The windshield wiper/washer switch supplies voltage on the signal circuits to the BCM for windshield wiper/washer operation. When WASH, MIST, DELAY, LOW, or HIGH is detected, the BCM energizes the wiper micro relay by suppling voltage to the relay coil. This allows battery voltage from the WIPER fuse to flow through the relay switched input then through the contacts and out the relay switched output to the wiper 2 relay switch contacts. Since the wiper 2 relay switch contacts are normally closed to the low speed circuit of the windshield wiper motor, the motor will operate at low speed.
Low Speed Operation
When the wiper switch is in the Low position, voltage is supplied through an internal resistor to the signal circuit. The body control module (BCM) monitors the windshield wiper switch signal 1 circuit, and energizes the wiper micro relay which will operate the windshield wiper motor. The wiper motor will operate at low speed, since the wiper 2 relay is de-energized. Low speed can also be commanded with a scan tool, by commanding Wiper Relay Cmd. ON and OFF. Refer to Scan Tool Output Controls .
High Speed Operation
In the High position, the windshield wiper/washer switch supplies voltage to both the wiper micro relay and wiper 2 relay coils. This energizes both relays and allows battery voltage from the wiper micro relay switched output to the switched input of the wiper 2 relay through its contacts and out the switched output of the wiper 2 relay to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed. During high speed wiper motor operation the wiper switch signal circuit is at the low speed signal voltage, and the body control module (BCM) supplies redundant voltage to the wiper relay via the wiper diode.
This info is out of hummer factory service manual !
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 !
Owner's manuals are not intended to assist in this type of repair. You need a shop manual, and even they may not cover this part. I don't know your mitsu, but in general two types of pumps are used. One type mounts to the bottom of the fluid reservoir, while the other is mounted to the wiper motor. Most aftermarket replacements come with instructions, but if you have bought an OEM part guess it did not. If the pump is on bottom of tank, remove the tank and it should be simple to replace. If made onto the wiper motor, these can be a bit tricky. If that is the case, you may want to have the dealer install the part.
While I was changing out struts on my 2007 Entourage, I had to remove the wiper motor. It was easy to do it, 4 - 10mm bolts and it was out.
Getting to the motor took a little more work but is not impossible. You have to remove the windshield vent cover (not sure what it's called), it's located at the bottom of the windshield, and when the hood is up, you can remove the wiper arms and those trim pieces and get to the motor easily.
This is a good general video that will show you how to roughly remove everything, granted this is a strut replacement video, but the beginning is what would be important to you: http://www.youtube.com/watch?v=UpSIv3mk98k Hope that helps!
it's likely the tiny motor/pump located at the bottom of the tank that has failed. to confirm this have some turn on the washer fluid switch and test for voltage at the pump. there are several aftermarket pumps you can use as a replacement.
advance auto stores replace wiper blades for free if you buy it from them.If the wiper arm needs to be replaced it has a nut at the bottom of it under a plastic cover.It bolts onto a shaft with splines on it so after replacing it turn it on and check it.You may have to loosen the nut and move to adjust it to get it in the correct position.