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Date: 18 Sep 2004 06:16:42 -0700
From: (R. Frist)
Subject: Re: weird windshield washer problem (c900)

Mats <> wrote in message news:<41tjk09jt0uojrcde0qmbtjrr500ipjdhlnospamcom>... > You could try to disconnect the headlamp wipers, just to be sure you > don't have a problem in one of the headlamp wipermotors. There are a 3 > terminal connector about 20 cm from each motor that you could pull to > test. > > /Mats > > On Mon, 13 Sep 2004 16:07:55 GMT, John B <> > wrote: > > >Hi, > > > >I'm experiencing a very weird problem with my 1992 900s. I drove a few hundred > >miles this weekend, and the car functioned perfectly in every respect. I > >especially enjoyed using my newly repaired cruise control. I parked the car as > >usual last night, and went to bed a happy Saab owner. > > > >This morning, when I started the car, the windshield washer started spraying > >immediately, wipers going, and headlamp wipers/washers going. Very strange. I > >fixed the problem temporarily by pulling fuse #8, which is labeled "headlamp > >wipers," and appears to also govern cruise control and the power side mirrors. > > Hi John, The same thing happen to me about two years ago except I was in the middle of traffic. I pulled the fuse then found that when I disconnected one of the headlight wipers things were OK. 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 anu 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

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