# Windshield Wiper start on their own **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [September 25, 2014, 8:37pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359 "2014-09-25T20:37:39Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [September 25, 2014, 8:37pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/1 "2014-09-25T20:37:39Z")
Hello, I hope that I can find someone to help me, I’ve 2007 Chevrolet Trailblazer, around a month ago the front Windshield Wipers started to start on their own, when I got the car checked the technician told me that I’ve to replace the Windshield Wiper Motor, I wonder if this is correct? and what would make the motor to starts on its own? Thanks in advance, have a good day. ---
**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\ **Post date:** [September 25, 2014, 8:52pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/2 "2014-09-25T20:52:38Z")
A faulty control board in the wiper motor unit does this. Replacing the unit fixes the problem and is much more cosr effective than trying to fix the fault. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [September 25, 2014, 9:08pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/3 "2014-09-25T21:08:13Z")
The wiper motor doesn’t need replacing because it works. The problem might be with the wiper motor pulse board. [http://www.rockauto.com/catalog/moreinfo.php?pk=982854&cc=1433505](http://www.rockauto.com/catalog/moreinfo.php?pk=982854&cc=1433505) The pulse board controls all the wiper motors functions. One thing to try is turn the ignition switch on without turning on the wipers. Open the hood and on the wiper motor push on the pulse board cover. If the wipers operate the pulse board is the problem. If the wipers don’t operate, then the problem might be in the multifunction switch. [http://www.rockauto.com/catalog/moreinfo.php?pk=1481934&cc=1433505](http://www.rockauto.com/catalog/moreinfo.php?pk=1481934&cc=1433505) Tester ---
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [September 26, 2014, 5:08pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/4 "2014-09-26T17:08:06Z")
Thanks Tester for your prompt feedback, as soon as I turn the ignition switch on the wipers start to work on its own. ---
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [September 26, 2014, 5:11pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/5 "2014-09-26T17:11:49Z")
Thank you guys for your help, I really appreciate you prompt reply, but is it possible to find a replacement of the board only, without having to replace the entire motor? ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [September 26, 2014, 5:38pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/6 "2014-09-26T17:38:38Z")
This is th pulse board that is bought separately. [http://www.rockauto.com/catalog/moreinfo.php?pk=982854&cc=1433505](http://www.rockauto.com/catalog/moreinfo.php?pk=982854&cc=1433505) ---
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [September 26, 2014, 7:00pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/7 "2014-09-26T19:00:01Z")
Thanks guys really appreciate your help, take care. ---
**Author:** ![knfenimore](https://avatars.discourse-cdn.com/v4/letter/k/9fc348/32.png) [@knfenimore](https://community.cartalk.com/u/knfenimore)\ **Post date:** [September 26, 2014, 7:17pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/8 "2014-09-26T19:17:44Z")
Let us know what happens when you get it fixed. ---
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [October 11, 2014, 3:51am UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/9 "2014-10-11T03:51:17Z")
HI, I want to thank you very much for your comments here, I got the part from ebay from “alldayparts” for around USD 82 + shipping as I couldn’t find it in any parts stores in my area, and I installed it all by my self. Thanks a lot again. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [October 11, 2014, 4:20am UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/10 "2014-10-11T04:20:18Z")
If you take a look at the old board under a magnifying glass you may find one or more solder joint that has a crack in it. That’s a common cause of PCB’s failing in cars. The material the metal layers are made of has different thermal expansion than the PCB material itself. This would happen on your home computer too, except that home computers don’t experience the extreme temperatures in cars, not to mention the jostling. If you see solder joints cracked, you might want to keep the old board around in case you run into this problem again. Sometimes it is possible to fix a cracked solder joint by simply re-soldering it. Glad you got your wipers working again. $82 is a bargain. Best of luck. ---
**Author:** ![afadali](https://avatars.discourse-cdn.com/v4/letter/a/b5e925/32.png) [@afadali](https://community.cartalk.com/u/afadali)\ **Post date:** [October 14, 2014, 10:41pm UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/11 "2014-10-14T22:41:11Z")
Thanks George, that’s really a excellent advice, I’ll try it and I’ll post the results. ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [October 15, 2014, 1:10am UTC](https://community.cartalk.com/t/windshield-wiper-start-on-their-own/87359/12 "2014-10-15T01:10:29Z")
I tend to think you aren’t going to be able to find the trouble visually. Usually, the type of trouble you describe is due to a faulty component, not a bad circuit trace.