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Discussion Starter #1
1996 Thunderbird, 214000 miles

I'm experiencing problems with my wiper/washer. The worst part is that it's intermittent and right when I'm about to pull out my test light and poke around, it's working perfectly.

When it does act up, nothing happens when I press the wash/wipe button on the end of the stalk. I don't get a "spray failure with a dry wipe", and I don't get a "wipe failure with a spray-only". Both the spraying and the wiping fail to work at the same time.

Due to the age, the mileage, and the general feel of the multi-function switch, I went ahead and replaced it. I was expecting that to be the cause of the problem. The new switch feels great, and everything seemed to be working properly afterward, but after a few weeks of driving, it's clear to me that something else is causing the issue.

So I'm hoping that it will fail again, but when I'm at home, so I can try to track it down. In the meantime, are there any common failure points that might point me in the right direction sooner?
 

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... In the meantime, are there any common failure points that might point me in the right direction sooner?
I'd start with the connector that plugs into the mfs; it gets crammed in there, and I had a wire break as I put the first one back in.

A short or open there can have all kinds of effects; the output is a resistance, and different resistances mean different things.

C206 is the gray connector.

The DB/W wire is the wiper interval and wash. It's a resistance to the BR/W wire. 100k max 3.3k min. Pushing wash is a short to BR/W.

The O wire is the wiper speed, also a resistance to the BR/W wire. 36.27k is off, 7.25k is int min, lo is 408k, and hi is a short, all to BR/W.

The BR/W wire is the reference wire, "output to ICM"

If it's not that, the problem is probably in the ICM, or integrated control module, according to the EVTM.

Good luck! :grin2:
 

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Discussion Starter #3
Wow, thank you! That really helps.

I'm hoping to have a chance to tear back into it sometime next week. Tonight I found a wet spot on the pass-side floor mat, so it looks like I'll be doing a heater core soon. So while I have my tools out and some of my interior apart, I'll go ahead and ohm out those circuits.
 

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Wow, thank you! That really helps.

I'm hoping to have a chance to tear back into it sometime next week. Tonight I found a wet spot on the pass-side floor mat, so it looks like I'll be doing a heater core soon. So while I have my tools out and some of my interior apart, I'll go ahead and ohm out those circuits.
If you're going into the dash, I'd find the ICM box, and "ohm my way back" to the switch.

It's on the driver's side, left of the column; maybe part of the fusebox, or real close. (can't tell from pic)

That harness goes thru connector C2022 (Yellow) behind the panel, to the left of the column.
DB/W pin 17
BR/W pin 7
O pin 6
These are the second pins from the end with a missing pin (18), and the orange wire is beside the BR/W wire.

At the ICM box, they're on C242.
These are the pin numbers:
DB/W pin 7
BR/W pin 1
O pin 8

It could be the box, too. :)

Additional stuff, somewhat related:

This box is on the 30A "Wipers" fuse. possibly #27
There's a separate park relay (BK/PK) in the ICM box, and it's own ground wire at the wiper motor.
All P81-1 96 EVTM
 

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Discussion Starter #5
I keep hearing that the Ford books are "so much better" than the more readily-available Haynes/Chilton manuals, but I didn't know they were this thorough! Thank you so much!
 

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Heh.

They're thorough.

They're complete.

Compared to them, the Haynes/Chilton books don't even make good toilet paper IMO *grins*

RwP
 

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I agree, Ralph. :)

I have a hard time keeping up with it, it just happened to be beside the computer when you asked, UT.

I'm sure this will help me too sometime, lol.
 
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