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Window won't stay down after opening door

Discussion in 'Model 3' started by rhaekar, Jul 30, 2018.

  1. rhaekar

    rhaekar Member

    Joined:
    Nov 9, 2017
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    Location:
    San Diego
    So this is a new one I haven't seen happen yet. My front passenger door window won't stay down while the door is open anymore. You press the open button and it rolls down slightly and opens but immediately rolls all the way back up.

    When my friend tried to close the door the window hit the trim and messed up my chrome delete and scratched the trim underneath. Now I have to manually roll the window down slightly and then roll it back up after it's closed. I scheduled an appointment already and was wondering if anyone had a similar issue.

    Already tried soft and hard resets. Seems like a sensor in the door is broken.
     
  2. rhaekar

    rhaekar Member

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    Location:
    San Diego
    I fixed it. The puddle light got disconnected causing the issue. I reconnected the puddle light and it's back to normal.

    Thanks to PooshdM3 for the tip!
     
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  3. favo

    favo P3D+ owner

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    Durham, NC
    Do you have aftermarket puddle lights or was it the stock ones? Seems odd that would cause the window to misbehave, but maybe something shorted or the wiring is connected to more than one component in the door.
     
  4. PoitNarf

    PoitNarf The Clown Prince of Crime

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    NJ
    I experienced the same behavior when I was replacing my puddle lights. I don’t understand why the window will roll up when the light is disconnected but it does. If this is by design then I don’t really understand the purpose.
     
  5. rhaekar

    rhaekar Member

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    Location:
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    They're aftermarket. The front passenger puddle light cable is very short so it was a tight fit. It must have pulled out of the connector from the door being closed over and over.

    I don't think it was a short because the connector was unplugged. It may have just been loose and got unplugged when I pulled the light out.
     
  6. mongo

    mongo Well-Known Member

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    Location:
    Michigan
    Purely hypothetical:
    The window/ door control module is using the ajar signal from the body side switch (or door latch switch) that drives the puddle lamp to determine whether the door is open or closed. Without the lamp connected, the signal has no load on it and the signal floats to the door closed state (or current sense shows zero), so the module always raises the window again.
     
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  7. Brass Guy

    Brass Guy Member

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    Holbrook, MA
    Well that's a dumb design decision. The same thing will happen if years down the road the light fails. I know, probably an LED and not likely to fail; but KISS - use the door latch.
    Curious: did the car indicate the open door was closed with the light disconnected?
     
  8. mongo

    mongo Well-Known Member

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    6,339
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    Again, hypothetical.
    And the module would likely have a load resistor such that it biases the signal as long as it is connected. Failure mode wise, the solder joints on the PCB would probably go first...
    Could also be a smart FET with open circuit detection reporting a fault that is not being handled well...
     

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