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Radio and Extension Box Malfunction

Discussion in 'Gen 3 Prius Main Forum' started by MrNoodle, Mar 23, 2022.

  1. MrNoodle

    MrNoodle Junior Member

    Oct 25, 2020
    San Diego
    2010 Prius
    Hello friends,

    Sorry to make another post of this issue, but I've tried everything suggested here with no avail.
    I bought a 2012 with the JBL radio that had the symptoms of the extension box malfunction: Apps button not working, Steering Wheel mode button not working, Bluetooth not working under setup, etc..

    This is what I've tried so far:
    1- I've tried replacing the extension cable first with a brand new one purchased from the dealership. Didn't fix it.
    2- Replaced just the extension box from one purchased on ebay. Didn't fix it but it could have been a defective box.
    3- Purchased a Radio/Extension box combo from ebay and it worked ONCE, I was able to pair my phone and the apps button was working fine. When I turned on the car again I was back with the same initial issue.

    I tried entering the secret menu, the EXT box says OK. The EXT BOX under diagnostics does not work.

    What else could be wrong? Why did the last replacement worked for 1 time only?

    Thank you so much for your help.