1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Issues with power windows, moonroof, power locks.

Discussion in 'Gen 3 Prius Technical Discussion' started by TomasV, Dec 14, 2016.

  1. TomasV

    TomasV Junior Member

    Joined:
    Dec 29, 2015
    52
    12
    0
    Location:
    Haddon Heights, NJ
    Vehicle:
    2010 Prius
    Model:
    IV
    Hello,

    Today I've noticed that my power windows don't work properly. The drivers side does not have the one touch open/close function anymore. And i can't control the rest of the 3 windows at all from the driver's side switches. The windows work with their own switch, just not from the driver's controls. Since I've had a similar problem before (my rear wiper motor was broken which caused the same problem with windows and the moonroof) i immediately checked the moonroof and it wouldn't open. The rear wiper works fine though. Also noticed that my power locks don't work either when i click the unlock doors buttno from the driver's controls next to the window switches.

    When i use the drivers window switch the light on the swotch itself blinks a couple of times and goes dark.

    The 12v battery wasn't disconnected and i don't think it lost power (the clock never reset itself).

    A week ago i notoced on the dash an alert that my key battery is low but i don't think it could be related in any way.
     
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    22,782
    14,807
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV


    Sounds like an issue, maybe intermittent, in the communications networks between these controls, especially the driver door switch cluster, and the ECUs.

    If it were me, for this I would go straight to the repair manual on techinfo.toyota.com, and look for the step-by-step troubleshooting procedure for these things. It can be intricate enough that your brain gets in knots if you're not sticking to a clear, check-this-before-checking-that procedure. I don't have a Gen 4 and it could be different enough from Gen 3 that I wouldn't be helping you any by trying to give other advice here ... and Gen 4 is probably still new enough that even on PriusChat there won't be many people yet who have that particular part of the manual slurped into their heads.

    -Chap
     
  3. Prodigyplace

    Prodigyplace Senior Member

    Joined:
    Nov 1, 2016
    11,696
    11,317
    0
    Location:
    Central Virginia
    Vehicle:
    2017 Prius
    Model:
    Two
    Ummm his profile says 2010. Gen 4 started with 2016.
     
  4. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,406
    48,778
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i would check the fob battery, 12v battery, and fuses.
     
  5. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    22,782
    14,807
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    So it does. My mistake ... I guess I had just been looking at other Gen 4 posts and mixed them up.

    So I'm a bit more familiar with that stuff in Gen 3, as I have one; going from memory, I think the driver door switch cluster contains its own little ECU and relays, communicates by multiplex to the Body ECU, and as for the stuff in the other three doors, it's just more traditionally wired back to the Body ECU. I think the sliding roof has its own little ECU.

    Still, I haven't personally had problems with these things, and have no direct experience with troubleshooting them. I think Techstream lets you see what switch positions it thinks you're holding, and it has active test options where you can command the motors in different directions. That could help with narrowing down where the problem(s) might be.

    None of the window or roof active tests actually work for me, probably because of the particular flavor of clone Mini VCI that I ended up with. I assume that with a better dongle they do work.

    -Chap
     
    Prodigyplace likes this.
  6. TomasV

    TomasV Junior Member

    Joined:
    Dec 29, 2015
    52
    12
    0
    Location:
    Haddon Heights, NJ
    Vehicle:
    2010 Prius
    Model:
    IV
    Strange problem indeed. While I was driving to the store to get a battery for the key fob the lights on the window controls lit up. So now the windows and the moonroof is working..
     
  7. TomasV

    TomasV Junior Member

    Joined:
    Dec 29, 2015
    52
    12
    0
    Location:
    Haddon Heights, NJ
    Vehicle:
    2010 Prius
    Model:
    IV
    Okay.. the problem reappeared a couple of days ago and is still present. The key fob battery has been replaced after the first time this happened so it's only a month old. Any ideas?
     
  8. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,406
    48,778
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    test the 12 volt health, and check the connections for tightness and cleanliness at the posts, and where the negative connects to the body.
     
  9. TomasV

    TomasV Junior Member

    Joined:
    Dec 29, 2015
    52
    12
    0
    Location:
    Haddon Heights, NJ
    Vehicle:
    2010 Prius
    Model:
    IV
    Ok. So if this problem wasn't weird enough it just got weirder. The power windows started working as expected. Now when the car is running and the hatch is opened the moon roof opens automatically! Should've seen my face... Checked the 12V health, it's fine. Checked all the connectors in the trunk and on the hatch. All as snug as possible. When I press the open button on the hatch the moon roof does not open, but when I start lifting it then it does. Any ideas?
     
  10. slewinson

    slewinson Junior Member

    Joined:
    Nov 1, 2016
    36
    30
    6
    Location:
    Australia
    Vehicle:
    2009 Prius
    Model:
    N/A
    Sounds like the 12v battery was flat or disconnected. After this you need to relearn the windows and roof by opening and closing fully. You need to open fully and hold the switch for 3 seconds, then close fully and hold for 3 seconds.

    The windows will work from the door switch but not the drivers door panel. I had this on my Lexus and thought I had major electrical issues until I discovered this.

    Simon
     
  11. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    22,782
    14,807
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    This is hard for me to picture without assuming some wire harness damage, water intrusion, or that kind of thing.

    How do the junction connectors look that are behind the kick panels at the front corners of the front doors? All dry and clean and non-corroded?

    Not that those are the only places there could be a problem, but they're down low and seem like a reasonable place to look and get a sense of wiring condition.

    -Chap
     
  12. TomasV

    TomasV Junior Member

    Joined:
    Dec 29, 2015
    52
    12
    0
    Location:
    Haddon Heights, NJ
    Vehicle:
    2010 Prius
    Model:
    IV
    Seems plausible since my windshield on the driver's side was leaking! I'll take a look at that.
     
  13. RRxing

    RRxing Senior Member

    Joined:
    Jul 7, 2009
    2,516
    1,789
    0
    Location:
    NEPA
    Vehicle:
    Other Hybrid
    Model:
    Limited
    Aha! Some new information to ponder. Every little bit helps...
    Check the fuse box underneath the dash on the left side for any water intrusion...
     
  14. Towertro11

    Towertro11 New Member

    Joined:
    Aug 11, 2020
    5
    0
    0
    Location:
    01612
    Vehicle:
    2010 Prius
    Model:
    III
    Hi all,

    Have a 2013 with similar issue including one touch on all windows, passenger window control from the driver seat, door lock button from the drivers seat, and moon roof operation. Car has been in a garage , so water instrusion seems unlikely, but with COVID it gets driven far less than it used to. Makes me wonder about the battery.

    Checking in if there was a final resolution to this issue. I will try the power window re learn next.

    Thanks,
    John
     
  15. Mitch Hanley

    Mitch Hanley New Member

    Joined:
    Jan 7, 2021
    1
    0
    0
    Location:
    02045
    Vehicle:
    2010 Prius
    Model:
    Two
    I've got the same issue. Any updates? Towertro11 or TomasV