has anyone ever replaced a wiper collum switch?

All my years of turning wrenches on the job & at hiome at night Grumpy, I have nevet had to replace the 1984-96 C4 steering column wiper harness. Not even the wiper switch.
On my 87 C4 the wiper switch is mounted forward in the. driver's door panel armrest.
Wipers never failed.
To remove GM C4 steering column wiper switch, push in firm grasping thecshaft.
Twist Counter clockwise. Its keyed tanged retained. Wires will extend out. Small screwdriver to disengage the lock tang.

I am thinking the Pulse wiper timer board failed on your 1996 Corvette. Held on with a single T-20 Torx screw . Black plastic outside cover.
I think its the same style wiper motor as my 1994 GMC Suburban K1500.
GM had lits of issues with wipers not shutting off.
Keep running unless main ignition key shut off.
 
Check & make sure the power connector is still ok too Grumpy.
Terminals corrode with time.
Wiper timer boad controls wiper Park position.
O'Reiley Auto & Napa sells the wiper boad seperate.
Save $$.

BR
 
thank you for the info!
IF you can find any diagrams that might also be helpful.
normally I,d just grab my shop manual, but,
I stupidly loaned my shop manuals out to a buddy who lives about 15 miles from here, and he went up state for xmass, so I can,t get them back until tomorrow at the earliest
 
I don't have a GM C4 1996 Corvette service manual Grumpy.
Working from my memory for You.
GM service manuals are Gold.
Must be a good friend to lone it out.
 
Ill have that factory shop manual, back in my hands by noon,tomorrow, if nothing unexpected happens,
but I really do appreciate any info or help you guys might run across.
I can,t see anyone owning an older corvette without springing for the matching shop manual, for that year, theres just so much basic info in them (not NEAR AS MUCH AS I WISH THERE WAS) but still a great deal more than the auto parts HELMS manuals


I found this doing some research on the issue in the morning Ill look into this further and post what I find
Jim G said:
The fix turned out to be easy in my case:

I bought a CD version of the 1992 service manual, and read the wiper section thoroughly, especially the diagnostic table. That table says that when the wipers won't shut off, the cause is most likely a defective park switch. But, my reading of other forum postings suggests that the problem is not really a bad park switch itself, but rather a corrosion deterioration of the electrical contact between the park switch and the motor assembly.

Early this morning, I unplugged the "Park switch" wiring plug from the driver side of the motor assembly, cleaned the terminals in it a bit, and plugged it back in. The wipers now shut off properly.

This weekend, I plan to do a more thorough cleaning of BOTH the plug and the receptacle on the motor assembly, using some tiny tool with electrical contact cleaner on it, then coat it generously with dielectric grease (to "waterproof" and protect from further corrosion) and plug it back in. Then, apply more dielectric grease to the exterior of the "joint" where the plug plugs into the motor assembly. Hopefully, that will protect it a bit better.

It appears the underlying problem is that water gets into that plug / motor assembly interface, and corrodes the contacts until the electrical contact is no longer sufficient to work.

Note that my fix did NOT require taking the lid off the motor assembly, but merely unplugging the EXTERNAL wiring plug to the park switch that is mounted inside the motor assembly.

Jim G
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ben said:
According to the FSM it is probably a faulty Park Switch in the Wiper Motor Assembly.
Tools needed to change out the wiper motor,,#20 Torx (for the cover), 1/2 wrench (nut that holds wiper crank to motor), 10mm socket with a wobble and a short extension( 3/8 drive)(about 3 inch or so).I believe a #20 also is used to remove, 4 screws ,screen at base of winshield. cuss words and beer. A flat tipped screrw driver helps in removing the electrical clips. (3 clips). If you want to remove the wiper arms themselves, you need a flat tipped driver for the little wedgey thingys. oops..a #10 torx for the screen...
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wip9.jpg

wip10.jpg

wip11.jpg

these pictures might be useful, if it turns out its a bad connection on, or in the wiper motor
 
There used to be a GM TSB On the 1990's era GM Wiper mptor pylse boad Grumpy.
In the past I would change them out under warrenty. By the dozens weekly.
I do recall one wire terminal does feed the park circuit switch.
Allways hot with ignition key off.
 
I have to rebuild the 1963 Pontiac GP 2-Speed wiper motor.
Its sluggish in the cold. 50 year old grease dried up on the Worm gear assembly.
They sell for $400 + on fleabay when they do show up.
Just insane.
Definate rebuild it. 1962-65 application only.
 
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