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Antenna schematics on the US 2010

Discussion in 'Gen 3 Prius Technical Discussion' started by rrolff, Oct 2, 2009.

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  1. rrolff

    rrolff Prius Surgeon

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    Does anyone have access to the stock antenna (AM FM) schematics?

    We know the EU has an antenna amp. I looking to both locate that amp, find if it powered and how, and possibly swap it.... If you can help, many I think will appreciate it (of course me included :)rolleyes:).

    TIA!!!

    Rolf
     
    #1 rrolff, Oct 2, 2009
  2. jayvee

    jayvee Member

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    Follow the beige antenna lead that plugs into the receiver assembly, back to a white connector, which is L36. This appears to be to the upper left, behind the radio assembly. That connector plugs into the antenna amplifier. There is no separate power lead on the schematic, so if it is powered, it is powered through the antenna lead itself (which is somewhat common for antenna amplifiers).

    It appears in the schematic that the antenna is directly attached to the amplifier (no connector), so I'm not sure you'd be able to replace it.
     
    #2 jayvee, Oct 3, 2009
  3. RodJo

    RodJo Member

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    Nothing on the TIS site?

    Similarly, I was planning to explore (eventually) the cellular antenna connection used for Safety Connect to see if I can couple my cellphone to it for better reception. I assume it also goes through an amp, which may be the same box.

    I guess you didn't see anything when you had your dash off? I assume you peeked around in the rear cargo area too. It shouldn't be that well hidden.... Or could it be?
     
    #3 RodJo, Oct 3, 2009
  4. RodJo

    RodJo Member

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    Are the Safety Connect connectors also shown on the schematic?

    Thanks.
     
    #4 RodJo, Oct 3, 2009
  5. jayvee

    jayvee Member

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    Yes, on a separate TIS schematic (EWD). If you're wondering about the cell phone and GPS antennae, they both show as going directly into L19, a white 38-pin connector, which plugs into the "Telematics Transceiver". Unfortunately, I haven't found exactly where this is, in any location diagrams. Sorry!
     
    #5 jayvee, Oct 3, 2009
  6. RodJo

    RodJo Member

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    Thanks for the help. Once I get my Prius I'll poke around and see if I can find it.
     
    #6 RodJo, Oct 3, 2009
  7. rrolff

    rrolff Prius Surgeon

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    Hrmm - I don't get it - an antenna amp should have some power - something somewhere? Or could this antenna just run straight back to the roof :confused:

    I know I bought a DTV antenna for my car - it has an antenna, but also 12VDC power and ground...
     
    #7 rrolff, Oct 3, 2009
  8. a64pilot

    a64pilot Active Member

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    Power can be run in the same coax as the signal, think GPS antenna and you satellite TV LNA's for example.
     
    #8 a64pilot, Oct 4, 2009
  9. jayvee

    jayvee Member

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    Exactly.
     
    #9 jayvee, Oct 4, 2009
  10. rrolff

    rrolff Prius Surgeon

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    So, the $10K question remains - how does the antenna get its power....
     
    #10 rrolff, Oct 5, 2009
  11. a64pilot

    a64pilot Active Member

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    I would disconnect the antenna, and then with the head unit on, measure for voltage in the coax. If you measure voltage, that may be the answer. The antenna may be powered by the head unit directly. Sorry, I'm not sure I'm using the word "head unit" correctly, by that I mean whatever the main stereo box is called.
     
    #11 a64pilot, Oct 5, 2009
  12. jayvee

    jayvee Member

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    IF it requires power (and some don't), as a64pilot indicated, the DC power can be "piggybacked" on the same wire as the antenna line itself. This is very common for satellite and TV amplifiers.

    Without having the design schematics for the amplifier and/or the NAV/stereo unit, there is not an easy way to know how, or if, it is powered. All we can tell is that there is only one coax wire going to the amplifier assembly, which is the same wire as the antenna connection.

    If someone were to get really ambitious, I guess you could see if there is any DC voltage on the antenna line. (oops - a64pilot posted first..)
     
    #12 jayvee, Oct 5, 2009
  13. rrolff

    rrolff Prius Surgeon

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    This is a quote from Frenchie
    "I will prepare some more pictures tonight....
    ps: do not forget the power supply for the radio antenna or you will get a very poor reception..."

    So at least in EU, there is a power supply for the antenna... I've got a PM to him for clarification...
     
    #13 rrolff, Oct 5, 2009
  14. rrolff

    rrolff Prius Surgeon

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    To those following this thread - this was posted by Frenchie in the Audion section (under new nav).

    "Antenna
    Here is a link to some pictures of european radio on prius gen3.

    I had to cut the cables because the original plug is not ISO.
    The power to the antenna's amp is the brown wire."

    So for me, this muddies up the whole question (lucky I have mud flaps). Similar frequencies, likely the same antenna, but the EU has an amplified antenna, and it may appear (still not confirmed) that we do not have an amplified antenna...

    I bought this antenna booster on Ebay today, FM Car Radio Signal Booster - eBay (item 140347252908 end time Oct-20-09 10:10:23 PDT) in hopes that it helps... We'll see. I can't imagine an antenna with what is probably a 20 foot lead without amplification (???) Though this may be why most think the antenna does not perform.
     
    #14 rrolff, Oct 7, 2009
  15. PazPrius

    PazPrius New Member

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    Did the antenna booster help?
     
    #15 PazPrius, Jan 25, 2010
  16. rrolff

    rrolff Prius Surgeon

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    This should be moved (and I think the reply was there) to the FM reception thread.

    No - the booster did a great job of boosting the existing noise. It was worse than before (as technically should be known). I believe the thread is showing some radios have issues (surprisingly stock, JBL and NAV). People have had them replaced, and report it works better.

    Read the whole thread, and you'll have a very good idea of theories vs reality... I'm sure Toyota knows about this and will take care of you...
     
    #16 rrolff, Jan 25, 2010
  17. scott seely

    scott seely New Member

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    An autosound store told me there is an antenna amp inside the black
    "pod" on the Prius roof. Is that true?
     
    #17 scott seely, Aug 6, 2010
  18. spiderman

    spiderman wretched

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    Not totally sure it is in the base of the antenna but there is one. I hooked up a Pioneer HU but forgot to connect the wire in the car harness to the "Power antenna" wire from the HU. My reception was really bad but it improved a great deal when I hooked that wire up.
    Now I don't know if that means the OEM HU's wire is not hooked up properly or not.
     
    #18 spiderman, Aug 6, 2010
  19. xs650

    xs650 Senior Member

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    As near as I can tell from the shop manual it is.

    The shop manual refers to that "pod" as "AMPLIFIER ANTENNA ASSEMBLY" ans specifically points out the "pod" without the antenna installed.
     
    #19 xs650, Aug 6, 2010
  20. rrolff

    rrolff Prius Surgeon

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    I think it's been posted elsewhere - the amp is near the actual antenna (roof) - which makes complete sense.
     
    #20 rrolff, Aug 10, 2010
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