Prius v Antenna XM Satellite Fading

Discussion in 'Prius v Audio and Electronics' started by rjparker, Oct 28, 2015.

  1. rjparker

    rjparker Senior Member

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    Good to hear it helped. Mine is still going strong a year later.
     
  2. timInAz

    timInAz Junior Member

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    I have a 2011 Prius and had a fading XM problem. Replaced the antenna/amplifier assembly on the roof. PN 86960-47011. I looked online but the diagram that showed up didn't look at all like what's there. So, I got one from the dealer and he gave me the online price - $120 after tax.

    Problem solved.

    I did it by removing the rear headliner light, then the 3 plastic fasteners that hold the headliner up (at the edge of the hatch opening.

    The electrical connector releases by squeezing on the right side of the assembly.

    7/8" or so wrench to loosen the nut that holds the assembly to the roof.

    I was able to do this by bending the headliner down (carefully and only as much as needed). Not a lot of room there; need to be patient.

    Tim
     
  3. uberlance

    uberlance Junior Member

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    I just wanted to add my experience as well. I added the TERK micro magnetic roof-mounted antenna as others have described in detail in earlier posts after having "NO SGINAL" from my OEM JBL non-NAV in 2011 Prius GenIII. I followed others' suggestions and install was pretty straghtforward and I also spliced the antenna to the original connector since the only adapters available seem to be around $60. I have a signal most of the time, but the performance is not nearly as good as it was before the OEM antenna went bad. Still, works OK considering the amount it cost to do as opposed to what others were reporting dealerships asking.

    For now its fine, but I may consider getting a new sharkfin with the part number above in the future, so thanks for posting that.
     
  4. thuff

    thuff New Member

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    Hello I picked up a used 2011Prius loaded with the JBL sound and nav. Like many of you the XM drops out if you get near almost anything. It is particularly bad on I20 between Atlanta and Birmingham AL. My guess the antenna needs more gain to work or replaced with a new antenna. Did XM reception get worse as the cars aged or was reception bad from the beginning.
    Also, XM sound quality on this radio is poor to because it has no base. I am thinking on adding a sub to improve the sound.
     
  5. rjparker

    rjparker Senior Member

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    My xm was fine when the car was new and fine after replacement of the antenna base. No base or a bad base means no or poor reception. Bass has nothing to do with the base.
     
  6. thuff

    thuff New Member

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    Thanks for replying. Can tell me how long the antenna worked before you replaced the stock antenna.
    Also the JBL radio has a limited dynamic range. I'm subwoofer tuned to the car to help low end.
     
  7. rjparker

    rjparker Senior Member

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    I would say it lasted about 3 years before the preamp in the antenna base started failing. XM would work on perfectly clear days with nothing in the southern path. If you read my posts in this thread you will get the total picture. By the way, some people don't know what they are talking about on this subject including some dealers.
     
    #27 rjparker, Jun 12, 2017
    Last edited: Jun 12, 2017
  8. franken1313

    franken1313 Junior Member

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  9. thuff

    thuff New Member

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  10. thuff

    thuff New Member

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    Thank you for letting me know. I will look at replacing the antenna amp to fix the reception. It is concerning it failed so soon. I do know the XM antenna amp in the aftermarket last for years. I'm sure they fail but I never have seen one. How long has the replaced antenna lasted?
    I will read the full thread now that I know it is there. Also, most do not understand RF and antennas along with the Toyota design's long sample rate that's makes skipping worse.
     
  11. thuff

    thuff New Member

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    I called two Toyota delars and the best price to replace the amp in the antenna base is just under $300. At that price I need to look at other options.
     
  12. rjparker

    rjparker Senior Member

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    As a last resort, read my instructions in the pdf attached to post 10 of this thread. I suppose most auto audio techs or confident diys could change it in their sleep but the real trick is getting the right part out of three antenna bases available for this year. Even that is available for your consideration in the pdf.
     
  13. rjparker

    rjparker Senior Member

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    This thread and the savings created by diy is dedicated to Mr King at Universal Toyota who would not even try to diagnose the problem while the car was still under warranty.
     
  14. CoastRider

    CoastRider Active Member

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    No, Sirius XM radio is not free. I got a $99 one year trial when I bought the car, I enjoyed it, but now they want something like $229 to renew it? It has about 200 or more stations, and I listen to only 3 maybe? :) I'm not renewing.
     
  15. saletoyota

    saletoyota New Member

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    Before the "new Prius XM" came out most of us installed our antenna on the back edge of the roof.

    I think you've got two main options...
    1)Move the antenna around on the Dash to see if there's interference from something reducing your reception.
    2)Take it to a radio installer shop (or do it yourself if you're comfortable with such things) and ask them to move it to an external location. The old reciever used to be installed in the back hear the hatch area, I believe the new one is installed under the dash and the lenth of the antenna cord might limit your roof installation location options a bit. But I agree, the roof is best.


    BTW, I had a 3"x3" original XM antenna that had great reception. But it was butt ugly and really broke up the roof line. I switched to one of the micro antennae and had an immediate decrease in reception when I pass under power lines and other locations where I didn't have any problems in the past. it's a bit frustrating, but since I have it installed under a Sharkfin antenna the look is very good and the reception loss I'd estimate as only 5%
     
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