Blower motor issues

Head to a junk yard and pull a fan... Of course maybe there's a fan relay that's failed? If it's a capacitor I would think that's probably built into fan, but have never taken one apart.

Everything already vacumed out and cleaned?

 

There's no relay (except in trims with the solar ventilation option, which have the SPDT relay that switches the fan power between the solar panel and the 12V system).

The blower you put in, where did that come from? Does it test ok on the bench?

 

Make sure your HVAC is clean and clear. Check your interior air filter and wiper cowl is clear.
If your fan is not turning when activated, check connections and wire damage. Don't know if those has a ballast resistor, that sometimes opens up on other cars.

 

No Prius generation had a blower resistor. Gen 1 and gen 2 had a blower motor PWM controller that mounted separately in the air duct, the same way older cars' resistors would be mounted, leading some people to still call it a 'resistor'. Gen 3 moved that into the blower motor itself and doesn't have the separate unit.

 

First thing I would suspect is the replacement blower motor is bad. Unless it was new oem.

I would check three fuses

Then do an active test with Techstream if available



Then check power and ground across the blower motor itself to ensure power and ground are good. A bad ground is just as bad as no power.

Finally you need a scope or meter with graphing capabilities to check the SI pulse train input.



If the replacement blower is not new Toyota oem from Toyota then my bet is it's bad.