Can I get the foot/defrost option to work in my 87?

[Guyana00]

I was wondering what it is that allows the function of the foot/defrost selection on the climate controls on the 89+ vehicles. They swap in to the pre-89's as most know but since it wasn't offered on the pre-89 climate control units it doesn't work.

I was wondering if using an 89+ dash/body harness would allow it to work. If so, I want to know what other differences there are that would cause problems for me using an 89+ harness in my 87.

I am going to be doing a 1jz pretty soon and will be working on this after the 1jz swap if this matters or complicates things further.

 

[hvyman]

the climate controls are the same except for the visual differences.

 

[Jeff Lange]

the climate controls are the same except for the visual differences.

No they're not.

The foot/defrost will not function with an 89+ control in a pre-89 car.

I am not aware of any easy way to make it work right now, though I haven't checked the wiring diagrams very thoroughly.

Jeff

 

[RazoE]

the climate controls are the same except for the visual differences.

while it plugs in, 89+ CC's have the extra function..

I found this out when I put an 89 CC in my girl's 86.5 and saw it didn't function, and the option didn't exist in the pre 89 CC..

 

[Guyana00]

If anyone has tried this or is able to figure out how. I'm not too good with electrical but can understand it wit a little explanation.

Knowing what needs to be done I can get it done, but truthfully I can't figure it out on my own. I asked in this section so if someone were to help me figure it out it would beneift other mk3 owners with this setup.

 

[hvyman]

http://www.cygnusx1.net/Supra/Library/EPC/291220/catalog.aspx?F=8715&P=3
http://www.cygnusx1.net/Supra/Library/EPC/291410/catalog.aspx?F=8715&P=2
http://www.cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?F=8715&P=2
http://www.cygnusx1.net/Supra/Library/EPC/291410/catalog.aspx?F=8715&P=2

i feel like im missing something????

 

[Jeff Lange]

You are missing something, and you're looking at the wrong diagram, and the biggest difference is the wiring, not the mechanical parts, although the air mode damper is also a different part number between pre-89 and 89+ as well.

Jeff

 

[Guyana00]

Any further insight, I wouldn't think it would be as simple as bridging the foot and defrost to the foot/defrost button, and don't think so. But I do want to know if there is a way,

So far, changing that one part isn't so bad, the wiring may not be either, but don't know where to begin.

 

[Guyana00]

I already know I can't figure this out, which is why I asked. If anyone wants to get in on this I'm making a last attempt to bump this.

If not I'll try to find out on my own and update this thread when the time comes.