I just got home from a cruise and on the way it started to rain, I turned on the wipers and door did not open. I tried opening the door with the overide switch under steering wheel and door still did not open. When I got home I poped the plug out of the Wiper door actuator and pushed in the plunger and the wiper door did open. I replaced the plug and I then started the car and the door closed. When I turned the wiper switch on still door did not open. I had them working a month ago ( had to replace the Wiper Arm Vacuum Switch and made sure I bought a new switch from a corvette vendor that pre tested to make sure it worked. any help would be appreciated, Bob....

 

Interesting.. The pre-tested switches were tested wrong! The video that is floating around shows the switch being tested from the lower port.. when in fact the vacuum is pulled from the middle port. The new imported switches will test fine if you test them from the lower port, but fail when tested from the middle. You can see from the diagram posted below that the supply vacuum source to the wiper arm switch is the middle port. Do I think this is your problem.. No.

You said you pulled the over-ride and the door did not open. Since the default is to open when there is an issue, I think you might have a relay issue.

So.. go to the relay and pull the small hose off the top and see if you have vacuum on it. When you pull this hose off the relay the door should open too.

If it does then the issue is somewhere else, if it fails to open I would then pull the yellow hose off the relay and double check it for vacuum.

You have to have vacuum on the yellow (6) relay hose for the door to open and close.

next I would then attach the small black and white hose to the relay and see if the vacuum switches from the top to bottom hose.



With vacuum on the small hose, you should have vacuum passing from the middle port to the top port of the relay (large hose's). Without vacuum on the small hose, the plunger in the relay drops and switches the vacuum to the lower port as shown below.



If you are switching vacuum.. then I would then turn my attention to the actuator...





Post back your findings..

Willcox

 

thanks for help !!!!

You said you pulled the over-ride and the door did not open. Since the default is to open when there is an issue, I think you might have a relay issue.

So.. go to the relay and pull the small hose off the top and see if you have vacuum on it. When you pull this hose off the relay the door should open too.

If it does then the issue is somewhere else, if it fails to open I would then pull the yellow hose off the relay and double check it for vacuum.

You have to have vacuum on the yellow (6) relay hose for the door to open and close.

next I would then attach the small black and white hose to the relay and see if the vacuum switches from the top to bottom hose.



With vacuum on the small hose, you should have vacuum passing from the middle port to the top port of the relay (large hose's). Without vacuum on the small hose, the plunger in the relay drops and switches the vacuum to the lower port as shown below.



If you are switching vacuum.. then I would then turn my attention to the actuator...





Post back your findings..

Willcox[/QUOTE]

 

I did as you explained and the door did not open when I pulled the small line off I did feel lots of vacuum so I then pulled the yellow line off and again felt lots of vacuum I suspected the brand new relay I installed was bad so I reinstalled the old one and everything worked fine, I am getting a hold of corvette central to get my money back!!!! I will now order these items from your website..... thanks again.. Bob

 

Hi Bob,
I got your VM.
I think that defective relays and vacuum safety switches are all too common.
Hopefully you have your problem figured out.
Good Luck!
Regards,
Alan

 

Just curious, which website are you referring to? I thought the Chinese had these relays all figured out?!

 

Check the Vacuum Switch for proper hose connections and adjustment of the plunger. If the switch has moved out of place, it will not pass vacuum to the relay.

 

I think it might be my site.. I've not had many issues out of the relay that we carry.. but needless to say, I'd better find a block of wood. The only US made relay is that of GM and they are off the charts expensive.


JNB, the issue was a defective relay, when he installed his old one the system worked fine.

Willcox

 

I was hoping you would say that. You guys are the only ones that I'm aware of that tests the vacuum stuff before you ship it.