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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    The parts I got came from a 2003 yukon slt but it seems all full size GM SUVs had rear air system, whether they are all auto or not I'm not sure But every resistor looked similar but I did open them up and did see some differences from one to another
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Ya that's why I kept buying from different brands and sellers and all listings would mention rear auto ac only and such
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Auto However you guys won't believe this shit I traced every wire, properly tested each circuit to verify I had everything front to back and replaced every linked component I went to the junk yard today and grabbed a upper console control, lower hvac control, rear console control, rear hvac...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Make it 4 lol Starting to feel defeated on it, can't wrap my head around it. When it's plugged in the ONLY way to get it off is unplug it or pull 30a rear hvac fuse under the hood... can unplug everything else and it just runs, unplugged bcm still runs Next trip to junk yard the only other...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    So on the oe resistor it shows 12v hot at pin c. The new ones don't have a diagram on them However for ***** and gets I just swapped the pins a and c and have the same issue, once I plug it in the blower comes right on.
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Yes. Already replaced it tho
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    The purple wire references ground so with a probe on 12v and the other on the purple wire you'll see the voltage change based on the knob up front, which mine does Does yours run full blast even when the truck is off tho? The only thing I havnt physically tried a new one of is a upper roof...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    I thought so too but does it even with the hvac controls unhooked up top and below the radio The 9v I think only appeared when it was plugged into the resistor on the purple wire, not plugged in it goes from 0-12v as the controls are increased
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    So I did depin the center pin during testing I just went out and depinned it and plugged it in, so purple was not connected and it still runs I totally agree it has to be the resistor, but I've tried 3 different ones all with the same result, they just free-flow the input voltage to the motor...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Blower runs full speed. The circuit is complete with almost no resistance from the hvac module to the resistor as far as the purple signal wire goes However I did test that the purple wire will go right to 9v when the resistor is plugged in, however not plugged in the voltage fluctuates fine...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    I've checked for short to ground on the purple wire in the rear, it's not resting at ground. I've I take my meter and put positive lead on the 12v orange and ground probe on the purple wire with the vehicle on or off, no "resistor" plugged it in reads 0v and will gradually increase as I change...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Even with the truck off? The diagram I found I traced essentially everything where the orange 12v lead runs up the d pillar, across the rear of the roof, down the driver d pillar, down the sill on the driver side and meets the white connector in the driver kick panel, this is the plug that...
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    06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED

    Gonna start out by saying I've been chasing this issue for a few weeks now, dozens of hours on forums and online, and checking stuff. Found similar issues, but not this one I've already thrown every part at it, just to do it at this point New upper control module Rear hvac module 3x blower...

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