Good Evening, I have a 1980 Corvette. I have replaced the wiper switch with a new one, I have replaced the intermittent wiper module with a new one and I have replaced the wiper motor. The only thing not new is the wiper motor cover and I used the one from the existing motor. My intermittent wipers still don't work. Hi and Low seems to work, but not intermittent. Do you think I have a bad new? What is your opinion?

 

Start with why did you replace the module in the first place? Was it malfunctioning? If so, obviously the root cause is still there. I won't be much help, but to tell you that I think the intermittent function might be pretty finnicky. When I added an electrick choke to my carb on my '79 I tapped it into the ignition hot wire to the wiper motor. That didn't work because I, too, no longer had an intermittent function. So, I un-did that connection and found an ignition on hot source elsewhere. So, you might want to keep this experience in mind when troubleshooting your problem. It might be somewhere in the HOT wire going from the ignition to the wiper motor. These things are nuts to toubleshoot. If your wipers were working OK before all of this, I would put things back the way they were, and replace one component at a time to isolate the culprit.

Al

 

Same issue here. I'll bet the switch is junk on mine and yours. There was an early batch of switches that they had problems with. Search function will help. This has been a popular subject in the past.

Craig

 

Are you certain it's an intermittent cover? It should have one pink wire coming out of it that connects to another pink wire that heads through the firewall. If it is the right cover have you checked to make sure it works? There';s a single carbon contact inside connected to a spring arm that is operated by a shaft attached to one side of the main gear. I'm pretty sure that the contact is normally closed. When not momentarily operated once each swipe the pink wire should have connection to ground.

 

were you able to solve your problem? I have the same issue, replaced the wiper switch, replaced the wiper control module (tried to rebuild old but could not find correct power transistor and replacement overheated), replaced the 33ohm resistor inside the wiper motor housing (cracked with minor burn). High and Low work fine. In pulse mode all I get is a wiper sweep every 23 seconds regardless of where my delay is set. I also measured the resistance into the wiper control module pin 141 and have readings from .935 ohms to 158 ohms (so assuming my switch is good). All my grounds check out fine.

Anyone know what the input and output values should be at the Wiper Control Module connector when in "Pulse Mode with/without Sweep"????

 

The cover is just a timer resistor to let the module know the position of the arms.... every time it sweeps it hits the resistor.

You can test this resistor, it's easy and the picture below will show you.



But.... I almost have to lean toward the wiper switch being the issue. If you have the old one they are easy to rebuild.

Here are detailed instructions on how to clean and repair the wiper switch.
http://repairs.willcoxcorvette.com/w...tch-repair.pdf

Here is how you tear the pot apart to clean and repair it.



Willcox

https://willcoxcorvette.com/
http://repairs.willcoxcorvette.com/

 

At least in my '79 there is a (for me) strange thing: It seems that if you have the intermittent wiper option you have to REMOVE the 25A fuse labeled 'WIPER' in the fuse block. (See also page 8A-75 in the shop manual).
Hope this added to the confusion ;-)
Robert

 

Well, I finally got mine working. this is one of those electrical gremlins that's hard to trace because there are no schematics for the wiper control module so you don't know the resistance and voltage tolerances expected.

After replacing the wiper control module (behind passenger seat in compartment with tire jack) and the 33ohm resistor (backside of the wiper motor cover - mine was cracked and slightly bulging) and a new wiper switch, my pulse would start but with no delay (pulse would happen about every 22 seconds).
I could control the pulse with the wiper cover removed and manually connecting the contact to the wiper motor pin (so I knew the module was getting its signal on wiper position)
Checked all wires/connectors for continuity and they were good.
After checking the schematics again I decided to look at the connector on the "WASHER MOTOR" (I initially did not think this was part of the pulse circuitry but it is). My connections were very corroded, even though the washer function always worked in all modes.
I cleaned the washer motor electrical connection and BEHOLD, my pulse feature is now working.

Had I put more thought into the schematics I would have checked this early on but I let the fact that the washer always worked when I pressed the wiper switch I assumed that was not the problem.
My Assumption is the corrosion increased the resistance in the circuitry dropping the voltage in the overall circuitry back to the control module preventing the control module timing control to reset after a pulse.

Side note: after getting it working, I rebuilt my original wiper switch and reinstalled it (so the new one I purchased is now another spare part)

Hope this helps others.