No blower?

Tiny
TAVIS.LITTLE
  • MEMBER
  • 2015 TOYOTA SIENNA
  • 3.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
When in auto or manual, climate control mode, no blower fan. The rear works fine, but the front does not come on no messages, strange sounds, or problems since changing the blower motor two years ago.
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Saturday, December 17th, 2022 AT 2:30 PM

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Tiny
STEVE W.
  • MECHANIC
  • 12,883 POSTS
Okay, step one will be to look at the 50-amp heater fuse in the relay box under the hood That provides the power to the blower. Next will be to access the blower motor and its connector, it is in the passenger side footwell. First check if it's plugged in, I have seen the connectors get loose before. If it is, disconnect the connector. Now take a simple test light and connect it to a good ground. Now with the key off touch the tip of the test light to pin one in the connector. That one should have a black wire. The test light should come on.
Next use the test light again and connect it to battery positive (the same wire just tested will work) then touch it to pin 3 which is a black wire with a white stripe. This is the main ground for the blower. The light should come on. If you get the power and ground at the connector the next step will be to connect the test light to a ground and turn the key on, then turn the blower to a medium speed and touch the test light to pin 2 which is the pink wire. The light should come on and if you change the fan speed it should get dimmer and brighter as it changes. If all three work, the blower motor has failed.
If you have no ground it runs in the harness over to the end of the dash on the right side, or you could run a new ground and splice it into the harness near the blower.
If there is no battery power and the fuse tests good at the box then there is likely a break in the wiring or a bad connector at the blower end.
If there is no control voltage on the pink wire it could be a bad AC Amplifier assembly, that is the main control unit for the HVAC system and it's on the right side of the HVAC unit behind the ECU box under the passenger side dash.

https://www.2carpros.com/articles/how-to-check-a-car-fuse
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
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Sunday, December 18th, 2022 AT 3:23 AM

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