Install GPS

Discussion in 'Gen II Prius Accessories & Modifications' started by mvo909, Apr 24, 2011.

  1. mvo909

    mvo909 New Member

    Mar 8, 2011
    Southern California
    Your Vehicle Year:
    2005 Prius
    Today I went to a place that was installing GPS for $70. They take your existing GPS and run the wire to an extra auxiliary plug in the back of your stereo. In short I do not have to plug into my cigarette lighter. Its a cleaner look and the GPS turns on and off with the car. I do not see any wires, but the GPS is still mounted to the windshield on driver side. My question is: will this drain my battery when the car is turned off. The person that installed it, assured me that it will not drain my battery when the car is off. I am taking his word for it, but wanted to get feedback to see if anyone else did this type of install or knows for sure that the aux plug in the back will not drain battery when something is connected to it.
  2. Corwyn

    Corwyn Energy Curmudgeon

    Mar 6, 2011
    Your Vehicle Year:
    2007 Prius
    If it is truly an AUX wire, the GPS will only be able to draw current when the car is in AUX, IG-ON or READY states.
  3. F8L

    F8L Protecting Habitat & AG Lands

    Aug 14, 2006
    Sacramento, CA.
    Your Vehicle Year:
    2013 Chevy Volt
    I don't know of any AUX plug in the back of the stereo.

    What they likely did was tap into the 12v ignition wire, 12v constant (battery) and ground wires. This will make the GPS turn off and on with the car. In some cases we would actually install another "cigarette lighter" power port behind the dash and plug in the GPS or XM Radio device's plug so that we didn't have to cut any wires.

    If they simply tapped into the stereo wires then there should be no drain on your battery when the car is turned off. If you cannot turn the unit on while the car is off then you are good to go.
  4. qmtran

    qmtran Junior Member

    Mar 12, 2009
    Seattle, WA
    Your Vehicle Year:
    2009 Prius
    ^ What he said.