Micra K11 Wipers
bill
Nissan Micra?
It is not beside the motor as it was on the previous model. The relay
is in the relay box but it is just a simple change over relay with no
timer. The relay tests ok.
A scan of the wiring diagram for the front wipers would also be
useful. I have the Haynes manual but the wiring diagram in there is
wrong. If it were wired like that, on some switch positions there
would be a short from 12V to ground!
Motor switch is giving a pulse each time wipers pass parking position.
BTW the problem is that the wipers work normally on low and high
except that they will not stop when turned off. On intermittent they
are continuous and still will not turn off. Washer is ok except that
wipers will not stop. Looks like timer is holding the relay on.
Possibly wet?
Either that or stalk switch problem. Pulling the timer would confirm.
--
(bill...@greekls.co.uk)
Chris Whelan
Autodata has no wiring diagrams for this model, sadly.
I'm guessing that it's unlikely there is a separate timer for the wipers;
far more likely it is done either through the ECU, or a central timing
module.
The Haynes diagram may well be correct. It is usual for the single pole
changeover internal self-park switch to disconnect from the permanent
feed, and connect the winding to earth in order to use dynamic braking to
stop the wipers accurately in the same position each time. If you re-
examine the diagram with that knowledge, it might make more sense.
You need to identify and test at the motor connection; if the signal to
start the wipers is remaining on, the fault is external to the motor. If
that is switching off OK, then it would seem that the internal switch may
have failed.
Chris
--
Remove prejudice to reply.
John
"Chris Whelan" <cawh...@prejudicentlworld.com> wrote in message
news:ULPcn.206498$6V1....@newsfe30.ams2...
I agree with Chris - the wipers are coasting past the 'brake' position and
re-starting. To test the theory grab hold of an arm to slow it as it comes
to the park position with the switch off.
If this confirms the problem then you have a bad earth.
John
.
>
> I agree with Chris - the wipers are coasting past the 'brake' position and
> re-starting. To test the theory grab hold of an arm to slow it as it comes
> to the park position with the switch off.
>
> If this confirms the problem then you have a bad earth.
>
A good generic diagram here. Good description of the motor becoming a
generator :
"When the motor ends up as a short-circuited (sc�d) generator on switching
off ."
Yours isn't being short circuited and the inertia could be allowing it to
re-start. Note how it is the parking switch that passes current to the motor
once it is off the park position.
John
"John" <Who90...@ntlworld.com> wrote in message
news:iHYcn.262166$4N3.1...@newsfe06.ams2...
Sorry - missed link:
http://www.woodenboat.com/forum/showthread.php?t=64204
bill
Many thanks Chris and John.
I think that this is how it is supposed to work. According to Haynes
wiring diagram the relay definately connects 12V to ground when not
energised when switch is in intermittent position! I am sure that
they got it wrong. It may very well actually be shorting the motor.
One end of the motor is hard wired to the 12V fuse and switching is at
the ground end(s). So it will not be a bad earth in the motor circuit,
it must be isolated from earth and shorted so all at 12V in park
position. I will pull the fuse and check what goes where with the
multimeter and hopefully correct the wiring diagram.
I do understand dynamic braking and how it would help in this
situation. I agree that this is probably what is happening.
Good idea to physically slow the wipers at park to see what happens.
Sounds like it could very well be the parking contacts not connecting
to 12V properly. It has to be that or the relay remaining energised
which was my first thought.
I'll check on Saturday.
--
(bill...@greekls.co.uk)
Mrcheerful
just disconnect the permanent live feed to the wiper motor, if the wipers
then turn on and off with the switch (but of course they will not park) then
you know it is a fault in the park circuit, if they won't work at all then
it is a fault in the switch/wiring/relays
John
"bill" <bill...@greekls1.clara.co.uk> wrote in message
news:iht9n5d3dnguqfaqc...@4ax.com...
That's the term - Dynamic Braking.
I suppose the park contacts could be in need of some attention.
bill
It was not possible to stop the wipers as they travelled through park.
The motor was definately powered.
Checks showed that the relay remains powered even with wiper switch at
off.
Relay is controlled by timer module which I have found. It is stuck
on back of wiper switch. Output of timer module measures 500 ohms to
ground with the module removed from the switch.. This probably allows
enough current to flow through the relay to hold it on after it has
been energised. Now need to fault find the timer. It is fairly simple
using a Temic U842B chip. The switch itself checks out ok.
Found the error in the Haynes wiring diagram. They superimposed two
lines within the switch making them appear to be connected.
I ran out of time, so to keep the car in service I have put it back
together with the connection to the relay left off. This allows it to
work in normal and fast mode and also on pulling the stalk foreward so
it is useable.
Will try to source a new chip in the meantime.
Thanks for all the suggestions.