Climate control blinking - code 02 - 1996
Thread Starter
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
Climate control blinking - code 02 - 1996
Blend door actuator got stuck on my 96, took the motor out, got it out of a bind put it back in, now heat comes on with heat, cold with cold, but it flashes code 2 which is maximum heat blend door travel exceeded. Went into diag mode 34 - shows 153 - which is correct, mode 24 shows 128 (should be zero). BUT everything is working and I clocked the motor back in the way it came out? How does the control head read temp door position, where does the reference of position come from? Any help would be appreciated!
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
The potentiometer which the system uses for door position is a part of the motor you had off. I'm guessing you didn't put the motor back in the same position on the blend door shaft that it was in when you took it off. If you're certain you're now getting max cold and max hot. You might try disconnecting the battery for a bit--then hook it back up and see if the control unit will learn the "new" positions.
Thread Starter
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
Tried that!
The potentiometer which the system uses for door position is a part of the motor you had off. I'm guessing you didn't put the motor back in the same position on the blend door shaft that it was in when you took it off. If you're certain you're now getting max cold and max hot. You might try disconnecting the battery for a bit--then hook it back up and see if the control unit will learn the "new" positions.
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
You may have tried this also-but here goes any way--
Quote: "The AC programmer logic will be lost if the AC programmer and the AC clutch are removed OR the negative battery cable is removed with the ignition in the ON position."
If you haven't already-- try one of the above and see it will relearn.
Quote: "The AC programmer logic will be lost if the AC programmer and the AC clutch are removed OR the negative battery cable is removed with the ignition in the ON position."
If you haven't already-- try one of the above and see it will relearn.
Thread Starter
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
thanks, so you think that would have a different effect than just disconnecting battery. So with ignition on, unplug a/c programmer? Also, is that info in the factory service manual or a tip you have picked up?
Another bit of info, the blend door count doesnt move at all even when its blowing 60 cold or 90 hot. Count still shows all cold all the time.
Another bit of info, the blend door count doesnt move at all even when its blowing 60 cold or 90 hot. Count still shows all cold all the time.
You may have tried this also-but here goes any way--
Quote: "The AC programmer logic will be lost if the AC programmer and the AC clutch are removed OR the negative battery cable is removed with the ignition in the ON position."
If you haven't already-- try one of the above and see it will relearn.
Quote: "The AC programmer logic will be lost if the AC programmer and the AC clutch are removed OR the negative battery cable is removed with the ignition in the ON position."
If you haven't already-- try one of the above and see it will relearn.
Burning Brakes
Joined: Feb 2009
Posts: 785
Likes: 3
From: Richmond Virginia
thanks, so you think that would have a different effect than just disconnecting battery. So with ignition on, unplug a/c programmer? Also, is that info in the factory service manual or a tip you have picked up?
Another bit of info, the blend door count doesnt move at all even when its blowing 60 cold or 90 hot. Count still shows all cold all the time.
Another bit of info, the blend door count doesnt move at all even when its blowing 60 cold or 90 hot. Count still shows all cold all the time.
First option is to remove both AC programmer fuse and AC clutch fuse at the same time--then reinstall.
Second option is to disconnect negative battery cable with ignition switch in the ON position--then reconnect cable.
Either of the above should clear the logic/memory and allow a relearn process.
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 207
From: Orlando FL
Blend door actuator got stuck on my 96, took the motor out, got it out of a bind put it back in, now heat comes on with heat, cold with cold, but it flashes code 2 which is maximum heat blend door travel exceeded. Went into diag mode 34 - shows 153 - which is correct, mode 24 shows 128 (should be zero). BUT everything is working and I clocked the motor back in the way it came out? How does the control head read temp door position, where does the reference of position come from? Any help would be appreciated!
http://forums.corvetteforum.com/c4-t...blem-94-a.html
But the first thing I have to ask is after you removed the motor, did you take it apart or change the position of any of the gears. Did you do anything before you re-installed the motor, what bind did you fix?
Also the motor only goes on only one way on the shaft of the blend door. Can't mess that up.
In the motor there is a pot with a 5 volt pick off that feeds back to the programmer for positioning. It can be monitored by having motor assess and pushing a pin into the blue wire of the motor connector and connecting your (+) lead of meter and grounding the negative lead to a metal point somewhere. As the blend door moves you can see the voltage swing from about 0.9 to 4.4 volts DC. I believe 4.4 was the cold end.
If the feedback voltage is not in the correct range, which relates to the alignment of the resistance (gear) of the pot (in motor), then the programmer will not be happy and you will keep getting the code 2 LED.
Thread Starter
Melting Slicks
Joined: Jul 1999
Posts: 3,214
Likes: 101
From: Decatur, Alabama
I took the motor apart, cleaned the thick grease and reinstalled in the same position. Then after error code, I tried a tooth either way. Right now, it seems it its working exactly right but not door movement feeedback voltage. Removing battery with key on had no effect
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