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roediger11

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I know this is an SHO site, but am looking for generic advice about my WINDSHIELD WIPER PROBLEM on 91 S/C T-Bird. Keep reading LoL! A little about myself: I live about an hour south of Vegas in northern Arizona and have an eclectic collection of 70s Opel GTs, 88 Fiero GT's and Buick Reattas. All my eclectics are manual transmissions except for the Reattas cuz they never came with a manual. I try to do my own repairs but am not a mechanic whiz kid by any stretch of the imagination. I've done brake pads and rotors, a clutch change once, many car stereo installs back in the day, and of course the obligatory oil changes. Always admired the 90-91 Supercharged T-Birds and I recently purchased one in great condition for a benevolent cause (going to auction it to raise money to help cover my wife's medical expenses and travel expenses to and from Mayo Clinic in Phoenix, an eight hour round trip). The wipers on the T-Bird have begun to operate randomly in the intermittent wipe mode (lowest/slowest setting) and will not stop swiping across the windshield. Actually, this annoying trait is not random. EVERY TIME I start the car and start driving the windshield wipers come to life and there is no way to get them to stop. They just keep slowly sweeping the windshield until the ignition is turned off. Is this a faulty E9SF-17C476-AB Windshield Wiper Module? Since I'm new to the site, I will start digging into past blogs that may address this issue. I want to get this problem fixed because I will not take it to the auction when I know it has this problem. Thanks in advance for all of your past, current, and future collective wisdom! - Gary
 
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SM105K

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I would say you are looking in the right direction. You can also unplug the wiper motor for the mean time. I have owned two SC T-Birds. An 89 and a 90. They also have a soft spot in my heart.
 

luigisho

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I think wiper motor issues were common on those cars. there is a tsb for loose wiper motor fasteners but more experience with failing motors. You can attack the switch first if you like. Can't really diagnose this myself


 

FiveLeeter918

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Welcome to the group, always had a soft spot for those myself, and the M90 supercharger was a great upgrade to the 3.8L Mustangs back in the day before LilRoush developed the M112 supercharger adapter for the 03 Cobra blower.

as for the switch, I'm getting a little conflicting information as I read your post. In your first mention, I took from it that the issue was that when you use the intermittent sweep feature it was actually operating as though it was and consistent back/forth motion. But in the second mention, it sounds like it starts sweeping as soon as you start the car.

Can you clarify on which it is? What frequency would you say it is operating at? When you turn it on intermittent, it is running as though it's on a medium level, fastest level, etc? Does changing the switch to a higher frequency actually change the output or does it ignore the switch's inputs?

Sounds like a ground issue to me, I would try to jump across the module and run straight from the switch to the motor and see if you have control there, if you do it's the module, if you don't it's the switch.
 

roediger11

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Welcome to the group, always had a soft spot for those myself, and the M90 supercharger was a great upgrade to the 3.8L Mustangs back in the day before LilRoush developed the M112 supercharger adapter for the 03 Cobra blower.

as for the switch, I'm getting a little conflicting information as I read your post. In your first mention, I took from it that the issue was that when you use the intermittent sweep feature it was actually operating as though it was and consistent back/forth motion. But in the second mention, it sounds like it starts sweeping as soon as you start the car.

Can you clarify on which it is? What frequency would you say it is operating at? When you turn it on intermittent, it is running as though it's on a medium level, fastest level, etc? Does changing the switch to a higher frequency actually change the output or does it ignore the switch's inputs?

Sounds like a ground issue to me, I would try to jump across the module and run straight from the switch to the motor and see if you have control there, if you do it's the module, if you don't it's the switch.
The "non-stop" wipers is best summed up in my second mention. The stalk is in the off position at all times and the wipers do their "slow drag across the windshield" whenever the ignition is turned on. If I purposefully move the stalk to a different wiper speed, the wipers DO react according to the speed I've chosen. It's just that when I return the stalk to the OFF position, the wipers keep doing their "slow drag across the windshield" every 15 seconds or so.
 

FiveLeeter918

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The "non-stop" wipers is best summed up in my second mention. The stalk is in the off position at all times and the wipers do their "slow drag across the windshield" whenever the ignition is turned on. If I purposefully move the stalk to a different wiper speed, the wipers DO react according to the speed I've chosen. It's just that when I return the stalk to the OFF position, the wipers keep doing their "slow drag across the windshield" every 15 seconds or so.


Hmm interesting. It sounds like a ground issue to me that is leaving that loop open despite being closed. How does the wiring on the steering column look? Any worn wires?

You might grab a multimeter and start probing different points of the harness to see at what point you start getting unexpected voltage on a switched position.
 

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