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Electromagnetic Wave :-h
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What vehicle is this from? The A/C amplifier is internal to the combination meter on the Celica.

Regardless, most likely it is to signal the ECU for A/C mag clutch control as the ECU will control it.
 

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Electromagnetic Wave :-h
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15,931 Posts
What ECU are you using?
 

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Electromagnetic Wave :-h
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15,931 Posts
Can you send the EWD or a link to it for that model?
 

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Electromagnetic Wave :-h
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15,931 Posts
I'm researching more. Found a few diagrams. But, looks like I need the diagnostics from the Big Book to try & figure it out.

Do you have the A/C amplifier from the ZZE123?
 

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Electromagnetic Wave :-h
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15,931 Posts
I've done some research and am having some difficulties. A lot of variables... like whether the ZZE123 ECU is auto or manual. I haven't even looked into the ae92 amp. I'm also finding that the ZZE123 manual I found is difficult to navigate & not as informative as the Celica's. I have a feeling you will need the ZZE123 ac amp. There really isn't much correlation to the ZZT231. While I like a good challenge, I'm busy lately & it's taking more time than I'd like to spend for free. So, I think I'd rather leave it in the hands of the paid guy.
 
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