Interior blower fan dead...blowing fuses. - Toyota Yaris Forums

CoryM · 07-22-2015, 12:08 AM

I'd unplug both switch and resistor. Plug in yet another fuse (it can be done using resistance too if fuses are getting expensive) Then ground the red wire at switch and leave it there for all the following:

Now jump the blue wire to ground at switch, then if OK blue at resistor. Fan should turn on full speed both times and not blow the fuse. This will rule out everything up to the switch and resistor. If ok, take jumper wire off, plug in resistor. if the fuse blows- replace resistor (it could still be wires, but very unlikely). If OK - take jumper wire and ground the black wire at switch. Fan should be on M1. If OK - jump green wire at switch to ground. Fan should be on M2. If OK - replace switch.

At this point, I'd bet the switch with it's multiple moving parts and contacts has failed.

CTScott: Any idea why so few cars use PWM for fan speed? Seems like it would be simpler/cheaper/cooler.

Cheers.

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07-22-2015, 12:08 AM	#15
CoryM Drives: 2009 5-door, 5-speed Join Date: Sep 2011 Location: White Rock BC Posts: 687	I'd unplug both switch and resistor. Plug in yet another fuse (it can be done using resistance too if fuses are getting expensive) Then ground the red wire at switch and leave it there for all the following: Now jump the blue wire to ground at switch, then if OK blue at resistor. Fan should turn on full speed both times and not blow the fuse. This will rule out everything up to the switch and resistor. If ok, take jumper wire off, plug in resistor. if the fuse blows- replace resistor (it could still be wires, but very unlikely). If OK - take jumper wire and ground the black wire at switch. Fan should be on M1. If OK - jump green wire at switch to ground. Fan should be on M2. If OK - replace switch. At this point, I'd bet the switch with it's multiple moving parts and contacts has failed. CTScott: Any idea why so few cars use PWM for fan speed? Seems like it would be simpler/cheaper/cooler. Cheers.