Wiper Problems

The wipers in my 97 blazer don't turn off when you shut them off at the switch. the strange thing is that sometimes they work and sometimes they don't. Generally when I turn them on they won't shut off until i turn the car off. I've heard that it's the motor, not the switch. Does that seem right?

Yeah, wiper pulse module

You need to re-weld the weldings in the circuit near to the motor of the windshield wipers

3 ways to go on it.
Solder the crack on the wiper pulse board circuit or just replace it or if you are lucky have your dealer run your vin no for a recall.
Some were recalled and some were not.
MT

3 ways to go on it.
Solder the crack on the wiper pulse board circuit or just replace it or if you are lucky have your dealer run your vin no for a recall.
Some were recalled and some were not.
MT
Recall ended Feb. 04 for '97s.

The wipers in my 97 blazer don't turn off when you shut them off at the switch. the strange thing is that sometimes they work and sometimes they don't. Generally when I turn them on they won't shut off until i turn the car off. I've heard that it's the motor, not the switch. Does that seem right?

This problem is quite common isn't it? I remember seeing a post before for almost this same thing.

Yes and all Blazers have this same wiper control card problem - so if you are lucky take the torx screws out of the cover and remove the card, fix any burned circuit tracks and if none then clean the melted grease around the whole circuit area and reinstall with some silicon sealer so mositure can't get in and do not over tighten the cover! THat will flex the card. If this doesn't work its a new $50 card install.

I pulled the wiring plug, removed the cover, removed the printed circuit board, heated the solder where the posts from the plug go into the board; put everything back together. That was over a year ago, no problem since.

Yeah!

Thanks, all - for all your problem descriptions and remedies. They were enough to point me in the right direction to resolve my 98 blazer intermittent wiper issue. It was indeed the solder joints on the wiper pulse board - specifically, the solder joints closest to the external connector. 8 of them had broken loose. It's a wonder it worked at all!

I pulled one wiper, the 3 piece plastic covers for the wiper drive linkages before I could reach the linkage nut on the wiper motor shaft. Next, I removed the electrical connector to the wiper motor assembly, then the 3 wiper motor assembly mounting bolts. Repairing the board only took me about 10 minutes, then I put everything back together in reverse order. All told, it took me about 2.5 hours. Having done it once, I could do it in less than 40 minutes.

One item of note - for those who don't mind working precariously over the engine, I imagine that it's possible to perform the repairs by just removing the 3 screws for the pulse board cover and perform the soldering with everything else in place. Has anyone done it this way?

One item of note - for those who don't mind working precariously over the engine, I imagine that it's possible to perform the repairs by just removing the 3 screws for the pulse board cover and perform the soldering with everything else in place. Has anyone done it this way?


I gotta tell you b-tird, you get the Ruby Goldberg award for fixing your problem.
You got the end result correct in a -long-about way.
All you needed to do was disconnect the connectors at the pulse board,remove the cover screw(s) and slide the pulse board out and re-solder or replace it.

But, congrats anyways. Job well done.

Thanks, all - for all your problem descriptions and remedies. They were enough to point me in the right direction to resolve my 98 blazer intermittent wiper issue. It was indeed the solder joints on the wiper pulse board - specifically, the solder joints closest to the external connector. 8 of them had broken loose. It's a wonder it worked at all!

I pulled one wiper, the 3 piece plastic covers for the wiper drive linkages before I could reach the linkage nut on the wiper motor shaft. Next, I removed the electrical connector to the wiper motor assembly, then the 3 wiper motor assembly mounting bolts. Repairing the board only took me about 10 minutes, then I put everything back together in reverse order. All told, it took me about 2.5 hours. Having done it once, I could do it in less than 40 minutes.

One item of note - for those who don't mind working precariously over the engine, I imagine that it's possible to perform the repairs by just removing the 3 screws for the pulse board cover and perform the soldering with everything else in place. Has anyone done it this way?

Thanks for posting back and letting us know how it went.
Glad you got it fixed.
If the engine is not running it will not bite.
Just remove the 3 screws and pull the board the next time.
10-4 that is the easy and the way it is usually done.
MT