High voltage ac fuse?

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Willie Walker, Jan 20, 2026 at 8:21 PM.

  1. Willie Walker

    Willie Walker New Member

    Joined:
    Dec 30, 2025
    14
    4
    0
    Location:
    Salisbury md
    Vehicle:
    2012 Prius
    Model:
    Five
    After swapping out 2 engine in prius Gen 3 the ac doesn’t work. If I disconnect neg 12 volt and orange disconnect from battery pack. Let seat for 15 minutes do you think I need 1000 volt gloves to take out fuse and check continuity? Thanks
     
    #1 Willie Walker, Jan 20, 2026 at 8:21 PM
  2. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    27,756
    18,329
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    Before trying that, or trying anything, I would start by asking the HVAC system for any trouble codes. (You haven't said a lot about just what sort of "doesn't work" you are seeing.)

    Start with the car off. Hold down both the A/C AUTO and FRESH/RECIRC buttons, while turning the car on (two power button presses, no foot on brake). Look for two-digit codes shown at the left end of the HVAC display, as described near the bottom of this page:

    Blink (a/k/a Flash) Codes – How to. | PriusChat
     
    #2 ChapmanF, Jan 20, 2026 at 8:32 PM
    BiomedO1 likes this.
  3. Willie Walker

    Willie Walker New Member

    Joined:
    Dec 30, 2025
    14
    4
    0
    Location:
    Salisbury md
    Vehicle:
    2012 Prius
    Model:
    Five
    I tried to do that and it didn’t work but I’ll follow your instructions and see if it’ll give me any codes. Thank you
     
    #3 Willie Walker, Jan 20, 2026 at 8:36 PM
  4. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    3,837
    1,991
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    If you've removed the fuse to check continuity, why would current be flowing across it? Now pulling the fuse out, you'll need to be careful of residual current in the system.
     
    #4 BiomedO1, Jan 20, 2026 at 8:37 PM
(You must log in or sign up to post here.)