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Date: Sun, 19 Sep 2004 06:59:47 GMT
From: Malcolm William Mason <mwm1(delete)nospamedu>
Subject: Re: Re: weird windshield washer problem (c900)

On 18 Sep 2004 06:16:42 -0700, (R. Frist) wrote: >Hi John, > >. When I >looked up the circuit diagram for the car (a 94 9000CSE) I figured >that it had to be a shorted diode but when I took the wiper motor >apart there was no visable diode. As it turns out, the diode is >embedded in a rubber like plug of stuff on the edge of the motor >housing and one does not have to disassemble the wiper motor. There >are probably diodes for the main motors as well so it could be one of >them. The purpose of the diodes is to allow the wipers to return to >their resting position after the power to them is shut off. There are >internal switches in the motors that get there power through the >diodes. If a diode shorts out it sends power to the all the motors >and the washer pump. > >The alternative is to simply replace the whole motor assembly. They >come up on Ebay all the time. > >Good luck, R. Frist This solution is the only one that makes sense, although there are some weird arrangements. Is it possible that the manually operated switch is so constructed that it can fail to a condition that it can "Transfer" power from one circuit to another (continuous or intermittent) but not "Interrupt" the power to both? I still like the diodes, however. Malcolm Mason

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