Took myu 300M in for 30K sergfvcie and now the wiper shield wiper fluid doesn't pump!

I made sure that it's full but it doesn't work where do I start trouble
shooting this beast?

Marc

 

"Marc"

Bring it back and tell them they broke it.

 

Marc,
According to my '99 FSM schematics, the same fuse runs the wiper motor
that runs the pump motor, so, assuming your wipers are working OK, that
fuse is good.

The +12V source to run that motor is connected to both a contact on the
multi-functuin switch (manual operation), and to a driver output of the
BCM (for automatically timed operation). So, if the pump doesn't pump
under any circumstances, the wires feeding power or ground to the motor
are bad, the pump itself is bad or there's a plumbing problem. Can you
hear the motor running at any time?

Disconnect the two-wire connector to the pump motor and jumper +12V
(brown wire) and ground (black wire) to the motor and see if she pumps
then. I believe the motor/pump is built into the washer bottle.

Bill Putney
(to reply by e-mail, replace the last letter of the alphabet in my
address with "x")

 

Interesting, maybe that helps explain why my wipers often wouldn't wipe when
the temperature was cold and the switch was on DELAY mode. BCM couldn't or
wouldn't send signal (wiper park switch?) but the ON position sends juice
directly to the motor. I'm surprised that any switches send juice directly
to anything without using the computer actually.

Dealer said they couldn't fix or find a problem when the car was under
36mo/36mi warranty. They did recently fix it under my service contract for a
$50 deduct (and some other work too) by replacing the entire wiper motor
assembly. I'm starting to really believe that paying $750 for 7 years
wasn't a horrible idea, especially if the windows start acting up. Prices
today for similar coverage are much higher though.

 

Actually that sentence of mine was referring to the washer motor - not
the wiper motor (upon re-reading, I see that I could have made that more
clear - but the context from the OP's post was the washer motor). But
keep reading...

The wiper motor is driven thru two relays (fast and slow). The relay
control signals come from the BCM. All wiper motor commands (on slow,
on fast, intermittent) go to the BCM from the multi-function switch MUX.

It is a very common problem (possibly 100% across the board?) with the
2nd gen LH vehicles that the wipers go haywire in cold weather (I'm
thinking 25°F and below). It is an obvious design flaw, and why they
haven't been recalled because of it I'll never understand since the
wipers are given the same priority as brakes as far as failure of a
safety system in the automotive design FMEAS (Failure Modes and Effects
Analyses) that I participated in.

I'll wager as winter arrives and temperatures drop, you'll start seeing
posts on this ng about wipers not working correctly in cold weather.

My guess, from the way my Concorde's wipers behave in cold weather, is
that the wiper park sense switch (probably a hall effect) output is
temperature dependent, and at some temperature, either it shifts enough,
or the BCM sense threshold shifts enough, or both, that the park sensing
is gets messed up. By them replacing your wiper motor assembly, the
park sense switch got replaced by one with a design (or calibration)
tweak.

Bill Putney
(to reply by e-mail, replace the last letter of the alphabet in my
address with "x")

 

We have a 97 Intrepid that has this problem off and on.
Some days the wipers work correctly on all settings.
Other days nothing happens until the switch is set to high speed.
While malfunctioning the wipers may stop mid stroke when switch is turned to
off,
also they may run continuously on intermittent.
Then suddenly it's all back to normal.
What to check?

Pete Geurds
Douglassville, PA

 

(Pete Geurds) wrote

There is a ground strap on one of the bolts of the motor.
Remove bolt and polish all the corrosion off strap and contact points.