Mr Fix It
Guest
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Posted:
Wed Dec 22, 2004 3:56 am Post subject:
Screenwash pump anomoly?? |
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I have noticed something weird on my 1987 730i (m30 engine).
There are two modes on the screenwash steering stalk:
Water wash only. (Pump 1 only).
Screenwash then water wash. (Pump 2 then pump 1).
The water wash function is fine.
The screenwash function seems to feed water only to the jets.
I have unplugged the water wash pump, then pressed the end of the
stalk to invoke the screenwash on its own ... which produced a dribble from
jets (of pure screenwash).
Plugging pump one back in sees the "water" part of the screenwash cycle work
again.
I have swapped the motors over ... same problem.
There seems to be only 6 volts getting to the plug which goes onto
the screenwash pump ... is this correct.
Holding the button in makes the screenwash pump activate its dribble
for 2 seconds, then off for 4 seconds, then on again for 2 seconds.
(Normal?)
Any ideas where to start ... does the screenwash pump have 6 volts sent
to it on purpose??
Maybe its a control module (one of dozens on this car) gone wrong??
B.t.w: The windscreen wipers work when either screenwash mode is used.
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Regards....
Steve
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