1. Offline

    dorf New Member

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    Location:
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    Your Vehicle Year:
    2007 Prius
    2007 Prius -12 Volt Battery Removal and Installation Instructions


    Removal


    Disconnect the Negative battery cable.

    Remove the Connector Cover (That’s the Big Red Thing)-Detach the 3 claws

    Remove No. 2 Quarter Vent Duct

    Disconnect the Brake Control Power Supply Connector
    Disconnect the 2 Fusible Link Block Connectors
    Remove the wires from the Quarter Vent Duct
    Remove the Bolt and Screw and remove the Quarter Vent Duct

    Remove the Fusible Link Block Assembly (Positive Battery Connection)
    Using a Clip Remover ? , Remove the clip
    Loosen the Nut and remove the Fusible Link Block

    Remove the Battery Hold Down Clamp


    Remove the Battery

    Remove the grommet, of the battery room ventilation hose from the vehicle
    Remove the battery from the battery
    Remove the battery ventilation hose from the battery

    Installation

    Install the battery room ventilation hose to the battery
    Install the battery to the vehicle
    Install the Grommet, of the battery room ventilation hose, to the vehicle

    Install the Battery Hold Down Clamp

    Install the Fusible Link Block Assembly
    Install the fusible link block with the Nut and Clip?

    Install the No. 2 Quarter Vent Duct

    Install the wire harness to the Quarter Vent Duct
    Connect the 2 Fusible Link Connectors
    Connect the Brake Control Power Supply

    Install the Connector Cover and attach the 3 Claws


    Connect Battery Negative Battery Cable-
    1 people like this.
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    RicCorless Junior Member

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    Location:
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    Your Vehicle Year:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    :yield:I have a problem that preceeds this explanation on 12v battery removal: how do you remove the cover over the battery compartment? Mine (2008) is so tight that I'm concerned about breaking something by tugging on it, yet I can see no fasteners to open. Any help would be very much appreciated!
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    hobbit Senior Member

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    Near the rear of the sort-of-triangular deck piece there is a
    vertical bit of plastic that goes up the vertical trim piece
    about two inches. Pry that gently away from the fuzzy bit it's
    attached to; you'll see that it hooks in with two small plastic
    claws. Then you should be able to lift out the rear end of the
    deck piece and work it out of the corner. The last thing to
    come clear is a largish plastic tab near the front.
    .
    Oh, and you definitely have to have the cargo tray [above the
    spare] out of the car or at least significantly shifted over
    to the left before going further..
    .
    _H*
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    9G-man Active Member

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    Location:
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    Model:
    Plug-in Base

    You must remove the folding floor/cover, then remove the cargo tray. Now you should be able to lift battery cover.
  5. Offline

    RicCorless Junior Member

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    Thanks very much! Yes, I had removed the folding floor cover and the cargo tray. The vertical plastic part I had not associated with the battery cover! Thanks to Hobbit for that subtle bit of insight!
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    nonobody1 New Member

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    Location:
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    This is very helpful info on how to remove the cover on the battery compartment. Now how do I remove the red connector cover???
  7. Offline

    Patrick Wong DIY Enthusiast

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    Don't worry about removing the cover. Just bend it up sufficiently so that you have access to unbolt the positive terminal.
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    don_chuwish Well Seasoned Member

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    Your Vehicle Year:
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    I hate that red cover, it seems to have a mind of it's own. Sometimes it pops off easy as can be, sometimes I have to pry on it from three sides with a screwdriver. Same thing going back on, it either pops into place on the first try or fights me for 5 minutes.
    But basically there are three tabs that hold it in place, when it's being moody a screwdriver on one of those tabs is a good start.

    - D
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    gabrielino New Member

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    Location:
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    Your Vehicle Year:
    2006 Prius
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    I am having trouble removing the small panel over the 12 v battery. Is there a easy way to remove this panel?
  10. Offline

    Patrick Wong DIY Enthusiast

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    If you are referring to the carpeted triangle-shaped part within the hatch floor, note the plastic piece that is attached to the side hatch trim. That piece has three clips that attach to the trim. Gently pull on the plastic to detach the clips.
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    cjcj1949 New Member

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    dorf's instructions are very clear. I was thinking of connecting a small 12V battery at the front fuse box to maintain 12V. Is it ok to disconnect the brake power supply (Capacitor Box) while 12V is still connected? There is a lot of information on what things are, but not so much on when things like the brake power supply are live or whether the battery needs to be disconnected before their plug can be removed. There could be large peak currents if things are done in the wrong order.
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    fwbrc51 New Member

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    Location:
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    Your Vehicle Year:
    2008 Prius
    Model:
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    before i disconnected any of the cables to the 12v batt in the back, i connected a fully charged 12v spare battery through the front with jumper cables, then proceeded to disconnect the cables in the rear. i never messed with 'brake power supply'.
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    jdenenberg EE Professor

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    Location:
    Trumbull, CT
    Your Vehicle Year:
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    Model:
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    I just replaced the OE 12v battery in my 2004 Prius at 214k miles (after over 7 1/2 years and it still holds a charge) with the new "Drop-In" Optima (I paid $170 for it using the offered coupon when it was introduced). I didn't bother to keep the 12v bus powered so I needed to reset the radio, clock, and auto window functions.

    One other problem occurred; the AC stopped working! :( The MFD said AC off and the steering wheel controls couldn't change temperature. It turned out that some of the electronics were out of sync. I noticed that the steering wheel controls for the defrosters still functioned so I hit the steering wheel AC mode switch which caused the MFD to say AC off. Then hitting the AC mode switch again got everything working again. :)

    JeffD
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    essaunders Member

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    Location:
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    I just swapped a new optima in for my old, now 3v battery.

    It was a direct drop in replacement.

    I didn't mess with removing the vent tube from the car - it was simple enough to disconnect from the old battery and plug it into the new.

    I never removed the fusible block assembly from the battery clamp bar. Imdidntwant to break that clip. No problems there.

    I left the optima carry handle attached to the negative end of the case, but disconnected it from the other so I could tuck it behind the battery and out of the way of the clamp

    Also, the only wrench size needed is 10mm. I used a long socket and an ignition wrench

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