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

Cabin light - fuse or relay?

Discussion in 'Prime Main Forum (2017-2022)' started by Iowatreefarmer, Nov 9, 2024 at 8:19 AM.

  1. Iowatreefarmer

    Iowatreefarmer New Member

    Joined:
    Saturday
    2
    0
    0
    Location:
    Iowa
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium


    Cabin light does not come on when doors are open, and the overhead switch is NOT in the "off" position. The light works fine when the switch is in the "on" position, so it's not the wiring to the light itself. I can't find a bad fuse, but I'm not exactly sure if I'm looking in the right place.

    Can someone tell me how to test the door jamb switches to see if they are bad?

    Can anybody tell me which fuses/relays to look at?
     
    #1 Iowatreefarmer, Nov 9, 2024 at 8:19 AM
  2. KCWhitney

    KCWhitney Member

    Joined:
    Apr 8, 2017
    94
    103
    0
    Location:
    Connecticut
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    I had that issue, recently and had to have the whole assembly replaced. About $400 at the dealer.
     
    #2 KCWhitney, Nov 10, 2024 at 4:41 AM
  3. Iowatreefarmer

    Iowatreefarmer New Member

    Joined:
    Saturday
    2
    0
    0
    Location:
    Iowa
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    KCWhitney, I want to see if our circumstances are the same.

    My dome light works in the "on" position. My courtesy lights at the bottom of the doors DO come on when the doors open. Is this what you were experiencing?

    Another question, in your case, is "whole assembly" the dome light? The dome light plus wiring? Thanks for your reply.
     
    #3 Iowatreefarmer, Nov 10, 2024 at 10:41 AM
  4. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    1,831
    928
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    If you can get the light to turn-on with the switch, it's probably not the fuse. I'd check the door switches and position of lamp switch. There are two. Map lamps and one rear center roof lamp. On mine, just unlocking the doors with my fob will activate interior lamps. If you think it's the door switch, test each individually. Opening any door that doesn't activate the lamp is a faulty switch. If you tried all 4 doors with neither lamps lighting, you've got the switches in the wrong place or the switch is bad. Again, if both map and center roof lamps should work, if set properly. If one lamp works and the other doesn't It's either the switch or the bulb, but you should be able to isolate that with the manual power switch.

    Hope this helps...
     
    #4 BiomedO1, Nov 10, 2024 at 11:01 AM
  5. KCWhitney

    KCWhitney Member

    Joined:
    Apr 8, 2017
    94
    103
    0
    Location:
    Connecticut
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    I don't really know. The dealer did it.
     
    #5 KCWhitney, Nov 11, 2024 at 5:01 AM
(You must log in or sign up to post here.)