Android Head Unit & JBL Amp Can-bus Issues

Discussion in 'Gen 3 Prius Audio and Electronics' started by Robolord, Jul 14, 2021.

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  1. Robolord

    Robolord Junior Member

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    I just picked up a new Joying JY-TQ194N4G (Android 10.0) for my 2011 with JBL audio but non-Nav system. Joying included a canbus adapter unit. I’m having a few problems.

    I guess I assumed, incorrectly, that that Joying canbus adapter would allow me to control the gain of the factory JBL amp, but apparently this is incorrect. So now I have a situation where the volume doesn’t get very loud at all. Additionally, the steering wheel controls are still not working, despite following all the directions provided by Joying.

    My question is, how can I set the amp gain to something more useful? Looking at some of the aftermarket canbus solutions like Axxess and iDataLink, none seem to support Android Head Units.

    I did try a method I saw online, which was to adjust the amp gain on the stock head unit before removing it, however, this didn’t improve the volume at all, so it seems the setting doesn’t persist in the amp for some reason.

    I see several solutions, with varying degrees of cost:

    1) Figure out how to interface the JBL amp. I’m stumped here.

    2) Try a line booster to increase the pre-amp line output from the Joying’s weak 2v power. Seems cheap but may not get what I need (still can’t fade or balance audio).

    3) Get a DSP that takes the Joying’s SPDIF output and creates a high voltage line level signal. More expensive and not necessarily any tangible benefit over a line booster.

    4) Bypass the amp with something easier to interface. Probably the best but most expensive and time consuming option.

    If anyone here has dealt with this, what’s your experience and recommendation? Thanks!
     
  2. Grit

    Grit Senior Member

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    since this wasn’t mentioned, turn the gain up?
     
  3. Robolord

    Robolord Junior Member

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    Yes, that would be fantastic. The stock amp’s gain is controlled by the head unit sending commands via the can-bus. There isn’t a knob on the side to crank. If you know of some way to change the gain I’d love to hear it!
     
  4. wheezyglider

    wheezyglider Active Member

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    You sure? I've window-shopped at crutchfield.com for android head units for the Prius. For some head units they recommend the iDataLink plus a Toyota-specific harness in order to retain the JBL amp and the steering wheel controls (SWC). For other HUs they only require a harness to keep the amp and SWC. (Plug in your year/make/model and they show you compatible HU's, and then for each of those they show you a matrix of adapters/harnesses and the features they enable/retain.)

    That said somewhere out there should be factory or community support for that Joying model you have, someone ought to know what's possible with its existing cabus adapter...
     
  5. ChapmanF

    ChapmanF Senior Member

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    I'm not positive that's so. I think the commands between the head unit and amp go over AVC-LAN.

    dspamp.png

    That may not make you any happier ... at least CAN is something of an open standard.
     
  6. abubin

    abubin Member

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    You shouldn't need to tinker with anything manuallly. Joying probably sent you the wrong canbus adapter. My seller also sent me the wrong canbus unit initially. It didn't have any sound but steering buttons was working. After providing proves to the seller, he send me another canbus which works perfect. FOC because it is under warranty. Sure, I need to wait few weeks for it to arrive from China but it's at no additional cost and I do not need to send the not working unit back.

    Not only that, few times they sent me fitting brackets cause I complained it didn't work properly. FOC of course.

    So I really recommend anyone looking to upgrade their headunit to check out my thread. Link to the seller is in my youtube videos.
     
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