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#1 |
![]() ![]() Drives: '07 Yaris 3D HB Auto Join Date: Jul 2007
Location: Cal
Posts: 44
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Help Needed: Unlink A/C to Defroster
I don't like the way how the A/C has to be on when I turn on the front defrosters. I think there are two ways to fix this: fake out the detector switch so the car doesn't know you turned on the defroster, or kill the circuitry that automatically turns on the A/C.
In case you don't have the Factory Repair Manual Handy: http://www.etimago.com/yaris/repairmanual/EWD.pdf http://www.etimago.com/yaris/repairm...nditioning.pdf This might get a little technical: Option 1 One guest is that the switch could be inside the control knob itself, and the signal could be turned off by shorting the signal wire or soldering in a resistor. Take a look at page 245 of the Air Conditioning manual for more info about this. Or there could be a switch in the air damper that controls flow to the front defroster. See page 10. Option 2 The Electrical Wiring Diagram Manual (filename: EWD.pdf) on page 239, 240, and 330 mentions "Defroster Mode Detection SW" in the context of air conditioning. SW means switch. The problem is that I don't know where this switch is physically located in the car. The diagram on page 50 and 52 might help answer this question but I can't put the two together. Any help is appreciated, and I know I'm not the only person who wants to get rid of this. |
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#2 |
Beast
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i really dont mind?
__________________
![]() One you've taken a yaris for a spin, there's no turning back. Its a Chao!!! |
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#3 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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there IS a switch inside the knob that activates the compressor AND THE BUILT IN HEATER...
you do not really want to get beyond that that in messing around the wires... |
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#4 |
![]() ![]() ![]() ![]() ![]() Drives: 2008 HB, A/T, Power W/L/M Join Date: Oct 2008
Location: LI, New Yawk
Posts: 2,063
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What about in the deep of winter, will the A/C still kick on?
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#5 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
I looked at the EWD. To disable it you would need to cut a trace on the printed circuit board for the AC switch assembly. I would have to pull one apart to figure out which trace, but the other option is to replace the switch. The EWD indicates that there is one "w/ Defroster Mode Detection SW" and one "w/o Defroster Mode Detection SW". |
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#6 | |
![]() ![]() ![]() ![]() Drives: 2009 Meteorite Metallic LB MT Join Date: Oct 2008
Location: Southeast Wisconsin
Posts: 810
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Quote:
that you drive an '07 LB? ![]() Just trying to clarify if there can possibly be any difference in the model years for the A/C. |
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#7 | |
![]() ![]() ![]() ![]() ![]() Drives: yaris 08 sedan Join Date: Oct 2008
Location: Montreal Canada
Posts: 1,286
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Quote:
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#8 |
73 Centurion droptop 455
Drives: 2009 S Sedan Join Date: Oct 2008
Location: Phoenix Arizona
Posts: 64
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The ac compressor in a vehicle should be run to prevent clutch and bearing problems.
Every Car I've owned mentions running the ac at least once a month. I'm guessing they just let the compressor run,so they don't have so ,many warranted a/c compressors to replace. I wouldn't worry about the few cents your going to save disconnecting the unit,I would worry about replacing a $1000 a/c compressor. |
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#9 |
![]() ![]() ![]() ![]() ![]() Drives: yaris 08 sedan Join Date: Oct 2008
Location: Montreal Canada
Posts: 1,286
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My winter setting is the defrost/floor position for the entire winter so i guess i have no other option than to have the air running all winter whether i like it or not.
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#10 |
vroom vroom
Drives: lil red 5-door Join Date: Sep 2006
Location: Bangkok, Thailand
Posts: 7,744
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winter or not, I believe the main reason for the AC kicking in is to dry out the air to help with the defrosting/defogging itself?
__________________
The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson ![]() Bye bye 1NZ... |
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#11 | |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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Quote:
you don't NEED to run with defrost/floor all winter long... put it back to the floor only when the front window is defogged. |
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#12 | |
![]() ![]() ![]() ![]() ![]() Drives: yaris 08 sedan Join Date: Oct 2008
Location: Montreal Canada
Posts: 1,286
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Quote:
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#13 | |
![]() ![]() Drives: '07 Yaris 3D HB Auto Join Date: Jul 2007
Location: Cal
Posts: 44
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Quote:
PS How do I subscribe to a thread if I forget to do it when I post? |
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#14 |
![]() ![]() Drives: '07 Yaris 3D HB Auto Join Date: Jul 2007
Location: Cal
Posts: 44
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Except the connection to the heater is probably via a mechanical linkage. I know that the vent knob operates via a mechanical linkage. With the car off and there's no power, you can still switch between the vents. On luxury cars I've driven before, the soft buttons activate a little motor that open and closes the damper that only works when the car is on.
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#15 | |
![]() ![]() Drives: '07 Yaris 3D HB Auto Join Date: Jul 2007
Location: Cal
Posts: 44
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Quote:
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#16 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
Go to User CP (control panel) and click on list subscriptions, then you can select the notification method for threads that you have posted in. |
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#17 | |
![]() ![]() ![]() ![]() ![]() ![]() ![]() Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Quote:
![]() ![]() From this thread about changing the bulbs: http://www.yarisworld.com/forums/sho...light=led+dash If you look at the close-up picture above the outer knob turns a plastic gear. I would bet that there is a boss on the gear that bumps a switch that parallels the AC switch. If so, you could just clip the boss... |
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#18 |
![]() ![]() ![]() ![]() ![]() Drives: yaris 08 sedan Join Date: Oct 2008
Location: Montreal Canada
Posts: 1,286
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Seeing as you have it all apart anyway can you give us a pic of the cam/boss that activates the air while in defrost mode? dont know why Toyota couldnt have given me the option of defrost with air on or off,like its only a matter of pushing a button if i want the air on.
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