The wipers on my 2003 LS 2 door freeze in the farthest travel position. Then later they will start again and operate as though nothing had happened. No amount of changing the wiper settings has any effect when they stop. I did change out the 'multifunction switch' some 3 or 4 years ago. I bought an Advance Auto Part M.F. switch. Any suggestions on this strange behavior? Oh yes, fairly new blades on the wipers.

 

I found a great write up by Swartllk from Oct. 2009. It says to remove the circuit board from the wiper motor and look for cold solders on the PCB=Printed Circuit Board. Resolder and you should be back in business. To remove this card without removing the entire W/S wiper motor, you remove two T20 Torx screws and ***only loosen *** the third T20 screw. Do not remove because it is difficult to get back into place.
https://blazerforum.com/forum/tech-a...r-motor-36236/

Does anyone know of a source for new PCB for the 2nd gen Blazer? Not everyone on the forum are expert solderers.

 

W/S wipers stopped ----Part II. I found a source for the PCB from good old Rock Auto Parts you see listed on the right side of this screen. They call the PCB a 'wiper motor module'. Here is a recap of my story.
My trips to town seemed to coincide with the afternoon T-storms. Then an unsettling thing would occur--I would turn on the high-speed wipers and they would lock up in the full up position. I would try all wiper settings, and none worked. Finally it would stop raining and then the wipers would magically come back on. I went to my Blazer forum, and they said it was a faulty PCB= Printed Circuit Board inside the wiper motor mounted on the firewall. There are three ways to address this problem. 1./ Remove and re solder the 'cold solder joints' on the original PCB. 2./ Buy a new PCB and R & R the old card. Range in price from $12.xx plus shipping for a Chinese PCB version to $77.xx for an OEM. 3./ Buy the entire wiper motor with a new PCB inside.
You can purchase an entire new W/S wiper motor for $49.xx for a Cardone motor to an AC Delco =OEM for $175.xx plus shipping. Both new wiper motors come with the new circuit board inside.
Three ways to fix it and three levels of cost. I ordered a new PCB from Rock Auto Parts for 18.xx plus 9.00 shipping and it will be here in 5 days. This is by the Cardone company who has been in the new and reman. parts for a long while. They say their card is upgraded to eliminate the OEM defects ! In the meantime, Plan B is I can just tap on the motor with a screwdriver handle to get it moving again and until my new PCB comes in.
The problem is the PCB has some cold solder defects that you DIY'ers with soldering expertise can re solder the bad joints. Costs nothing if you have a soldering pen. Now you are good to go.

I choose just the no. 2 option of a new Cardone 'improved' PCB card for only $29.08 with shipping and tax. It is due on June 17 -- 5 shipping days.

 

My new Cardone PCB came in one day early. So I got an early start on swapping out the old original board with the new one. It came with a Printed Circuit Board with the attached female plug in. They also sent 3 new T20 screws and a new plastic cover. I did notice when I compared the old and the new boards that the new one had no ground strap like the old one did. I thought that was a serious omission and called Cardone and they said no, it was made that way. They e mailed me a photo and it showed the cut out but no ground strap. I put it together with the new cover and reused the original T20 screws. I put some silicone sealant on the cover as the meager instructions recommended.. I cleaned out the housing as they recommended. Be sure to follow the suggestion to remove only two of the three mounting screws and only loosen the third screw on the bottom right side. You then wiggle on the cover plate using the third screw as a locating pin. Then install the other two screws and tighten the three T20 screws down in a criss cross pattern. Don't over tighten them. I gave the wipers a test and they worked. The real test will be on the road in a T-storm with the wipers on HIGH. I looked at the old PCB and saw no obvious 'cold solder joints'. That made me glad I went ahead and bought a new board.
The only two tips I would share with you if you are planning this swap is this. Put an old sheet or a towel under the windshield wiper motor area. This is to 'catch' the tools and the Torx screws you are sure to drop. You will need a Torx 20 socket and a 1/4" palm wrench or a 1/4" Tee handle to do this job. A Torx with a regular screw driver handle is way too long to fit in the very confined space. Let us hear how your repair went. Thanks, Jim in SC

 

Image of PCB aka Windshield Wiper Control Module from Cardone: I am really glad this actual photo of the Cardone replacement PCB was available. Two things I want to point out: 1./ Note the 'U' shaped cut out just to the left of the square black connector. It is where the metal ground strap is located on the original PCB. When I called Cardone, the tech support said it wasn't needed. This ground strap was omitted on purpose !?! 2./ Note on the lower left of the PCB corner. It has the sharp corner cut off. That also is on purpose. It allows the directions for 'removing the two T20 screws and only loosening the third T20 screw. Do not remove it.! ' That cut out of the corner allows you to do that. When installing the new PCB, you place the new cir. board on that T20 as a locating pin. It is the third T20 screw which is hard to see because it is 'down and under' the wiper assembly. When you do this operation, you will see why is is important to leave in 'loose and in place'. It makes your install much more quick and convenient.

 

I have a great photo of the Cardone PCB, but do not know to send it to this post.

 

We have had several Tropical Storms and Trop. depressions swing by SC and the W/S wipers have not missed a beat. They don't freeze in the far left or wide open position as before. They shut down correctly when turned to off. Now looking forward to rain. Good to have them working again.

 

Brief update on 'w/s wiper motor repair with new PCB by Cardone. We have had some more trop. storms and standard afternoon Thunderstorms come through. Original motor with the new PCB has worked great., For a cost of less than $30.00 compared to a reman. motor with new PCB-card cost of $80.00, I am happy. It would have been cheaper to 're-solder the cold solders or cracked solders' but I could not see any and still have the old original board. I am happy with the path I chose to get me back on the road. T/S Fred just came by SC and it prompted me to post this update.