1993 CSE electical problem

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Johannes - 12 Jun 2006 15:54 GMT

The problem is that windscreen wiper & wash (www) will not disengage unless I
remove fuse 7.

However, fuse 7 is for headlight wiper & wash AND horn, something different.

You see the problem. To stop the www running continuously, I remove fuse 7, but
then I lose the horn. Now www can be switched as usual!

According to Haynes, www is on fuse 8 and hence separate from fuse 7 circuit,
so how come that fuse 7 can energise the www. It just happened one day out of
the blue, and I removed fuse 7 to stop the damned www from emptying the
reservoir.

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Nasty Bob - 12 Jun 2006 16:24 GMT

> The problem is that windscreen wiper & wash (www) will not disengage unless I
> remove fuse 7.
[quoted text clipped - 8 lines]
> the blue, and I removed fuse 7 to stop the damned www from emptying the
> reservoir.

Hey Johannes. Think your problem stems from your headlight wiper
motor(s)
See this link for what to do about it.
http://www.saab9000.com/procedures/electrical/headlampwiper.php
Hope this helps :)

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Johannes - 12 Jun 2006 17:10 GMT

> > The problem is that windscreen wiper & wash (www) will not disengage unless I
> > remove fuse 7.
[quoted text clipped - 14 lines]
> http://www.saab9000.com/procedures/electrical/headlampwiper.php
> Hope this helps :)

Thanks a lot. I guessed it was the headlamp wiper and tried to disconnect the
wires at the socket; the horn is more important than the headlamp wiper.

It is precisely that, the diode in one of the motors has failed to become
bi-directional. Hence it can energize the www.

Unfortunately, the 3 wire socket is fused together after all those years,
but I could cut the yellow wire, then simply fit a new diode into the circuit,
leaving the old diode in situ.

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John B - 12 Jun 2006 17:35 GMT

> It is precisely that, the diode in one of the motors has failed to become
> bi-directional. Hence it can energize the www.

I had a similar problem in a c900, caused by a failed headlight wiper motor.
Problem solved by unplugging the motor in question. Maybe someday I'll get
around to replacing it, but it's hardly a priority.

John

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Johannes - 12 Jun 2006 18:45 GMT

> > It is precisely that, the diode in one of the motors has failed to become
> > bi-directional. Hence it can energize the www.
>
> I had a similar problem in a c900, caused by a failed headlight wiper motor.
> Problem solved by unplugging the motor in question. Maybe someday I'll get
> around to replacing it, but it's hardly a priority.

probably easier under the bonnet of a c900 than a 9000 CSE, it's just so cramped
at the front and the wire plug has seized. I might just snip the wire though.

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Richard Sutherland-Smith - 13 Jun 2006 01:05 GMT

>> > It is precisely that, the diode in one of the motors has failed to become
>> > bi-directional. Hence it can energize the www.
[quoted text clipped - 6 lines]
> so cramped
> at the front and the wire plug has seized. I might just snip the wire though.

Take the grille off and the headlamp out :-)

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Richard & Mary Sutherland-Smith
19 Webb Road, Wanganui 4500, NZ
NOTE new postcode

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