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Cooling fan is not working the fan motor is good

Tiny
JOSEPH UGWUNEKE
  • MEMBER
  • 2004 TOYOTA SIENNA
  • 3.3L
  • V6
  • AUTOMATIC
  • 98,000 MILES
The cooling fans are not working. There is power on supply to the fan controller, but the module does not run the fans. What voltage is expected from the small wire that comes with the power cable?
Sunday, June 26th, 2022 AT 10:48 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,883 POSTS
It sounds like the controller is bad, but here are the cooling fan wiring diagrams so you can see how the system works. The signal comes from the engine ECU. This guide can help you check the wiring connections to help find the problem:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, June 27th, 2022 AT 11:59 AM

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