Relearn Procedure for Rear Blend Door Actuators?

Discussion in 'Audio & Electronics' started by Justinj360, Apr 14, 2019.

  1. Justinj360

    Justinj360 Supporting Member

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    I just replaced the temperature blend door actuator in the rear of my 2004 GMC Yukon with auto climate controls. Before I replaced it I checked to see if the actuators were moving when I changed the settings. The mode actuator worked fine but the temperature actuator seemed to be dead so I replaced it. Nothing seems to happen with the new one either now. Even with the actuator just hanging there it still doesn't turn.

    I'm wondering if there's a relearn procedure for the rear actuators? I've tried the normal relearn procedure but that didn't seem to do anything for the rear. I also pulled out the rear HVAC fuse at the same time as the front HVAC fuse. I figured doing that made sense at the time. Any ideas?
     
  2. Justinj360

    Justinj360 Supporting Member

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    I followed what this guy did and tested the voltage at each wire. All of mine were good except for the yellow wires on both actuators were reading 0 (or very close to it). I'm thinking the control module is bad (part number 15185966) Can anyone help with this?

     
  3. HiHoeSilver

    HiHoeSilver Away!

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    I don't have any real info to add, other than in my research on rear heat not working, it seemed the control module was the common culprit.
     
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  4. Justinj360

    Justinj360 Supporting Member

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    Any info at this point is a huge help. I've come to that same conclusion as well. Before this, I thought the actuators were the most common failure with the HVAC.
    Of course now that part has been discontinued by GM. My dealer is currently looking into some leads on a couple though. We'll see what they say.
     
  5. HiHoeSilver

    HiHoeSilver Away!

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    Not sure if you have the digital control or not, but I think it's one of these. There are a bunch....
    Screenshot_20190415-111214_Chrome.jpg
     
  6. Justinj360

    Justinj360 Supporting Member

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    The part I'm looking for looks like this. I do have that too but it is different and for the blower motor or something. Unless I'm confused.

    20190414_232549303_iOS.jpg
     
  7. HiHoeSilver

    HiHoeSilver Away!

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    You're probably right. Let me know if you find it. I think I need one to. Do you have the digital controls?
     
    Last edited: Apr 15, 2019 at 1:02 PM
  8. Justinj360

    Justinj360 Supporting Member

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