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1998 Plymouth Voyager wipers won't turn off

Tiny
TDW100
  • MEMBER
  • 1998 PLYMOUTH VOYAGER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
When I turn on my windshield wipers, then turn them off, they won't turn off immediately. In fact, they stay running for maybe 20 minutes. I have tried replacing the switch (on the steering column) and the wiper motor itself to no avail. I have tested the on/off relay and high/low relay. They are working fine. I am thinking it is the BCM, but have no idea how to 1) find it, or 2) verify if it is faulty or not.

Any ideas?
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Saturday, July 31st, 2010 AT 11:29 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi tdw100,

Thank you for the donation.

To test the BCM, appropriate scan tools would be required.

I have sent the diagnostic files to you. BCM location is shown.
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Saturday, July 31st, 2010 AT 11:53 AM
Tiny
TDW100
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  • 4 POSTS
In your reply, you state that "the appropriate scan tool is required". Can you tell me exactly what scan tool is required so I can determine if I will go buy one or not.

Thanks,
Tom
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Saturday, July 31st, 2010 AT 1:55 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Generic scan tools an be used but it might not be able to perform all necessary test functions. To be fully compatible, it should be equivalent to Chrysler Diagnostic Readout Box.
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Saturday, July 31st, 2010 AT 2:11 PM
Tiny
TDW100
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  • 4 POSTS
Everything is clear down to step 4. Resistance from Wiper On Relay terminal C to ground is open (infinite resistance). This step tells me that the problem is the BCM.

Can you explain to me why this tells me the BCM is bad? What is the resistance from this terminal to ground supposed to be?

Nearly done. Thanks!
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Saturday, July 31st, 2010 AT 3:19 PM
Tiny
KHLOW2008
  • MECHANIC
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From the steps, it does not indicate the BCM is bad. The resistance should be below 100 ohms, but did not indicate if it should be open, which you mentioned is infinity, indicating open circuit. For this you should be checking the wiper ON relay control circuit.

If resiatance is 100 ohms or more, the BCM has internal fault, possibly some part is not working correctly due to high resistance.

Go through Step 5 and see if there is any problem.
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Saturday, July 31st, 2010 AT 11:04 PM
Tiny
TDW100
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  • 4 POSTS
Could you tell me where the wiper on relay circuit is? The picture in the original documents you sent me point to some location that isn't clear to me.

Thank you,
Tom
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Monday, August 2nd, 2010 AT 9:51 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
It is in the PDC, Power Distribution Center.


https://www.2carpros.com/forum/automotive_pictures/192750_PDC98VoyagerFig02_1.jpg



https://www.2carpros.com/forum/automotive_pictures/192750_PDC98VoyagerFig04_1.jpg

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Monday, August 2nd, 2010 AT 11:48 AM

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