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Old 01-05-2008
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Eatc Help

Ok I finally have all my parts for the Eatc Mod. I am following Johns how to and I am in the testing phase right now. The issue I am having is the blend door actuator. I bought a new one online for 98+ models. The guy i bought the plug from said it was from a 98+ but it is actually from a 95-97, and he also gave me the blend door with the plug. Now i figured to adapt my new 98+ blend door I would just not hook up the extra two wires in the plug, well the blend door did not work when i did the test and i got the error code 24. Ok so i decided to try the old blend door, with the two wires hooked up. Same result. Would there be a pin out difference with the 98+ models of the blend door? Also do all of the components need to be hooked up for the test run? Like if I just hooked the blend door up and nothing else should it still spin the drive shaft? I am going back to check all of my connections now, but i figured i would throw this out there to see if anyone else has had any issues like this. My luck probably just a connection issue somewhere.
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Old 01-05-2008
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also when i test my fan speed controller it makes a clicking noise when i turn it to high
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Old 01-05-2008
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PM John (n3elz).......he can tell you how to modify the plug to work properly
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Old 01-05-2008
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ok well i think it is a pin issue. I when i hooked the old blend door up with the other two wires it turned a little bit. I still got error codes 024 and 025 with using that old blend door, but it was making a connection. When i plug the new blend door in nothing happens and i get the 024 error, and no connection is happening. So im not sure what wires are mixed up.
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Old 01-05-2008
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bump
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Old 01-05-2008
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Sorry. I'm a bit busy at the moment, but I'll get to it as soon as I can research the pinouts. Probalby won't be until tomorrow late sometime.
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Old 01-05-2008
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well i was working on the set up some more and the blend door drive shaft on the old blend door is moving alot, so there is def. a connection there. I tried hooking a test light up to the fan speed controller, but I am not sure if I did it right, because i get no light. Here is a picture of what i did. I think i did it right?
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Old 01-05-2008
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ok, i didn't see your post before the last. I think i have a bad fan speed controller anyways, it clicks when i turn the fan on high, and there is no response from the light.
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Old 01-06-2008
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Okay, I got the diagrams out for the various EATC actuators and connectors.

There are, as I mention in my how-to, 3 basic types of blend door actuator. There are 3 basic types:

1. Older model EATC
2. Later model EATC
3. Non-EATC (with slightly different wire colors between late and early model bu the same basic hookup.

Below is the 1995 model year actuator hookup schematic and pinout.

I'll post the ones from later models next, but note that this hookup uses 2 additional wires over the later model hookup. I discuss how to handle this in my how-to -- either type is useable.
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Old 01-06-2008
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Here's the later model type from a 2001. Note the rearrangement of wiring and color coding.
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Old 01-06-2008
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Finally, here are the two different variations on the non-EATC actuator. I present this only for identification purposes. You can't use these.

However, you can use the connector if you remove the pins and reposition them so that they connect at the correct locations. In such a case the wire colors will be wrong and you'll have to make a conversion chart so you know which wire substitutes for what. Sometimes it's hard to get the right pigtail (connector with some wire on it) for the EATC actuator, but many Ex's have the non-EATC one that you can get and modify.

Below are the 1995 and 2001 versions of the non-EATC connectors respectively.

Armed with this information, you should be able to determine what you have and what you can do with it.

As far at the actuators go, the EATC ones have that written on them. Any other one is probably bogus and won't work no matter what the seller says. Be careful.
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Old 01-06-2008
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ok, i am going to attempt to convert the 95 plug to 98, hopefully this will solve some issues with the 024 code
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  #13  
Old 01-06-2008
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Yes! This solved the problem, the wiring from the 95-97 Blend door will NOT work with a 98+ EATC head unit. I now just have to find a working fan speed controller.
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