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Old 07-14-2015, 05:17 AM   #1
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Replacing Windshield Wiper Control Module

Has anyone replaced a windshield wiper control module on a Thor Serrano 34M? If so can you please give me an idea as to where it is located. Wipers will start out on low speed but if it starts to rain harder and you switch to high speed it will not return to low speed. It will only operate on high speed from that point on. It will reset once unit is off for an hour or so. Any help will be greatly appreciated. New control module on the way. Thanks.

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Old 07-14-2015, 10:49 AM   #2
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Serrano 31x
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Old 08-13-2015, 12:07 PM   #3
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Bad Wiper Harness

I had the same problem with a 2011 Serrano 33A. The problem was not with the control unit, but with the wiring harness that connects to the wiper motor. After filing a complaint with NHTSA I got an E-Mail from Thor stating that some wiring harness were not correct and the thermal overload due to the incorrect wiring harness was preventing the wipers from running in anything but high speed, which by passes the thermal overload. Check with Thor technical support. I've also talked to other Serrano owners with the same problem.
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Old 09-14-2015, 04:11 PM   #4
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wiper works great on all settings....for a couple minutes. Turning key off/on they reset and go a little while more. Thor says replace "wiper relay" ( I replaced the control module) Where's the relay? Can't find it. Any other ideas? Thanks
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Old 11-10-2015, 07:31 AM   #5
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Mine was repaired by Thor tech in Indiana.
Dave and Nola, RVM1
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Old 11-12-2015, 08:04 PM   #6
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Though our chassis is different than yours, I had the exact same problem. While driving in the rain, water was getting into the wiper motor wiring connector inside the engine compartment above the engine compartment access door. Dis-connect this plug and dry it out(WD-40). Re-connect and test. To keep moisture out, tape it up with electricians tape and if possible, locate it up higher inside the compartment where it is more protected from driving rain entering openings at the front of the RV.
Ellen & Greg
05 National Dolphin 5342
Workhorse W22 FMCA # F431548
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Old 11-13-2015, 01:44 PM   #7
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my control module is inside down low next to the steering column. Mine got wet from a windshield leak and it went crazy. One I traced the trouble found the water logged control module and dried it with a heat gun.

Fixed the leak and put aluminum HVAC tape over the module to prevent such a future occurrence.

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99 36 FL Winne Chieftain 5.9 ISB Turbo Cummins DP, 24' box with 1972 V12 XKE Jag and HD Sporty Hobby of 1970's Suzuki dirt bike restoration. Visit my blog.
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