[michaliv]

[solved] Blower Motor Stuck On High

2009 Toyota Corolla, Manual HVAC. What would cause the blower motor to be stuck on high? It does not matter if I turn the fan speed knob to 0,1,2,3, or 4, it will not change speeds or shut off. I replaced the blower motor resistor, but that did not resolve the issue. AC/Heat still seems to work fine, just the fan can never be changed. This only runs when the car is on (I have seen several posts where this happens even when the car is off). I have read in for some it could be a relay that is fused together, but have no idea where this relay is located. Any ideas? Thanks in advance.

 

[michaliv]

Still looking into this issue. I am thinking it may be the blower switch. I have removed the switch. I get a Ohm reading when I touch pins 1 and 2 and I get a reading when I touch pins 1 and 10 (see attachment). These are the only ones that give me a reading no matter which position the switch is set to. Does anyone know if this is to be expected? I would think that the resistance would change to different pins based on which setting the switch is set (0,1,2,3, or 4), but I cannot find what each pin goes to. Any help on this? I just don't want to order a $100 part without confirming first it is the issue.

 

[invader]

Inspect blower switch continuity-

http://www.tcorolla.net/inspection-1259.html

 

[somick]

As far as I remember the AC relay is somewhere in the vicinity of the cabin fuses. Inside the cabin. It is grey. Few months ago on my son's 2012 Corolla the AC completely stopped working. It was a switch.


Search internet for electrical diagram. It helped us a lot.


Good luck,
Sam

 

[michaliv]

I found an electrical diagram, but I could not find one that would help me determine which wire in the connector would associate with each speed setting. I did test continuity on the switch after I pulled it out and it had the same pins that always had continuity no matter how the switch was set. I have found a switch that I have order to replace the current switch. Hopefully this will resolve the issue. I won't get it in until late next week. I will update this thread as soon as I replace the switch. Thanks to all for the advice.

 

[michaliv]

I received the new switch yesterday and that did resolve the problem. I guess something within the switch broke while the fan was on High.

 

[somick]

Thanks for posting.


I guess that is another weak spot in Toyotas.


Sam