HVAC BLOWER ISSUES

[yaris2010RS]

Lets just get it out now...... That what she said....

So yesterday i was revamping my audio system, due to a hum from one of my speakers i decided to rewire my entire audio system (Double din HU, 12" Kenwood shallow series sub, 1200Watt mono block amp, 1400Watt 4 channel amp, 8 speakers, 2F Cap)

I re-ran all the wires from the HU to the amps and then from the amps to the speakers. i also re-ran the power wires and remote wires.

I was very happy with the sound of the system when i was done and the hum is gone.

Today when trying to go out i found out that i somehow fudged up my HVAC Electric blower......Actually the entire HVAC control unit seems to be acting up. It no longer lights up when the head lights are one, nor does it turn on the HVAc fan. The AC light will illuminate as long as the selector switch is on any number other then 0 and my rear defogger light will flicker when i press it but will not stay on.....

i did check fuse #3 under the drivers side kick pannel and fuse #24 (iirc) in the engine bay and they do look fine. with fuse #3 removed i was no longer able to control the brightness level of the instrument cluster.

Also on my HVAC controls, i did check the voltage at the main connector and i did have 12 volts on the red wire

any ideas where i may have messed this up? Thanks in advance

[CTScott]

Check the 7.5A PANEL1 fuse

[yaris2010RS]

Thanks Scott, I did also check that one (#2 i believe) and it was also fine.

With that fuse pulled my cluster no longer displays my headlight on illumination, also my dimmer switch does not function with that pulled

[CTScott]

OK. How about the GAUGE and AC fuses?

[yaris2010RS]

Gauge and Ac fuses all check out fine.

[yaris2010RS]

it doesnt appear i have anything on the car acting up, all my other illuminations work and the car does run and drive around.

Is it possible the hvac is controlled through the ECM or is it straight mechanical from switch to HVAC motor?

the red wire to the fan speed selector does show there is +12v going to it. is it possible this harness has a seperate ground that came loose?

Does the harness from the control unit go to either the drivers side or passengers side plugs/harness kick pannel s?

im trying to figure out how i could have messed this up and behind the kick pannels were a high traffic work area

[CTScott]

The AC ECU is not controlled by the ECM. Did you check the 40A fusible link on the face of the under dash panel.

[yaris2010RS]

^ no i dont believe so, where is that?

[CTScott]

Right behind the little storage cup.

[yaris2010RS]

give me a min, ill run out and check

[yaris2010RS]

that also appears to be fine, i couldnt see a 40A one, i have 2 30A

[yaris2010RS]

what would be some measured voltages at the plugs?

also where would be some good places too look for a fault of some sort?

[CTScott]

Does the rear defroster work?

To start with, I would check the connectors on the AC ECU, which is located under the edge of the carpet to the right of the gas pedal.

It has two connectors - One with 16 pins and the other with 24 pins.

On the smaller connector: Pin 8 - Yellow - 12V Ignition switched

[yaris2010RS]

the rear defroster sometimes lights up..... it kind of flickers as im pressing it and depends how i release it if the light will stay on.

The AC light will turn on and off no problem

[yaris2010RS]

now the rear defroster seems to be working fine, it doesnt like being shaken around while its engaged

still no HVAC fan

[yaris2010RS]

did just run out the HVAC fan itself, no voltage going to it

[yaris2010RS]

LOL, fixed it..... will post pics once the photos are auto uploaded to my PC

[yaris2010RS]

FIX UPDATE:

This caused my problem. the black cap apparently was not clipped on correctly, not sure how i managed to not put this cap back on....

http://i1194.photobucket.com/albums/aa375/rsyaryar/20121229_222952.jpg
http://i1194.photobucket.com/albums/aa375/rsyaryar/20121229_223311.jpg
http://i1194.photobucket.com/albums/aa375/rsyaryar/20121229_223319.jpg

im assuming this plug would be for the Auto climate control available to our japanese friends. this was very annoying but thanks CTScott for all your help

[CTScott]

Ah, that makes sense - It isn't for anything as fancy as the auto-climate controls, but is actually just a junction connector. There are a few of them on the car, which are used to tie more than two wires together at a junction point.