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Fuse location for rear view mirror?

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by rkalbiar, Feb 14, 2018.

  1. rkalbiar

    rkalbiar New Member

    Joined:
    Oct 29, 2017
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    Location:
    Oregon
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Does anyone know where the fuse is located for the rear view mirror? I hate the auto dimming feature and want to kill it. I have no concern about losing Homelink too.

    Thanks!
     
  2. Elektroingenieur

    Elektroingenieur Senior Member

    Joined:
    Jan 8, 2017
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    Location:
    California
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    The Electrical Wiring Diagram, available by subscription to techinfo.toyota.com, shows that the Inner Rear View Mirror Assembly is powered from the ECU-IG1 NO.4 and ECU-DCC NO.2 circuits, which are also connected to other essential loads like the Combination Meter, Main Body ECU, Driving Support ECU Assembly, and Certification ECU. I advise against removing these fuses, of course.

    I assume you wouldn’t be satisfied with turning off the automatic anti-glare function each time you start the car, as discussed on page 297 of the Owner’s Manual (PDF), but have you considered covering the rear-facing sensor, shown in the illustration on the same page, with some opaque tape? This should prevent the mirror from sensing bright lights behind the car, which would stop the automatic dimming.

    I don’t recommend any modifications, but if you want an electrical solution, you could disconnect the mirror assembly at connector O7, which isn’t used for anything else and should be accessible once the No. 2 and No. 1 Forward Recognition Covers have been removed. (See the procedures in the Repair Manual, also on techinfo.toyota.com.) Be sure to secure the separated connectors so they won’t rattle.
     
  3. rkalbiar

    rkalbiar New Member

    Joined:
    Oct 29, 2017
    7
    2
    0
    Location:
    Oregon
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Yes, currently, I turn it off manually - OFTEN.
    Cover the sensor!? Duh. Thanks!
     
    Elektroingenieur likes this.