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Highbeam malfunction

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by pazrunner, Jun 20, 2016.

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  1. pazrunner

    pazrunner New Member

    Joined:
    Apr 6, 2016
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    Location:
    Wisconsin
    Vehicle:
    2006 Prius
    Model:
    II
    This is a new issue for my 2006 Prius. All seemed to be functioning normally until recently. Now, when my headlights are on, and the highbeams are off (highbeam lever pulled back), when I shut my car off, my highbeams come on. I then have to push the highbeam lever forward to shut them off. When the car is turned back on, if the headlights are turned on, the highbeams come on. I have to pull the lever back to shut them off. In other words, the correct "on/off" position for the highbeam lever is dependent upon whether the car is turned on or off. This has resulted in a number of occasions of my parked car being left with the highbeams on, draining the battery, and me coming back to a dead car.

    I have "rebooted" my car by unplugging the negative battery terminal for a half hour, but this didn't solve the issue. Any thoughts?
     
    #1 pazrunner, Jun 20, 2016
  2. andrewclaus

    andrewclaus Active Member

    Joined:
    Sep 15, 2009
    993
    324
    0
    Location:
    Golden, CO
    Vehicle:
    2007 Prius
    To start with cheap stuff first, check the headlight relays. They're called DIM and H-LP, in the main relay block in the engine room. You'll need a wiring diagram, a 12V source, and an ohmmeter. If the relays and associated wiring are okay, the body ECU may be malfunctioning and that's not cheap. Wiring is different for HID and DRL options. Good luck.
     
    #2 andrewclaus, Jun 20, 2016
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