With a Non JBL and non nav radio does the steering wheel radio controls use resistance

Discussion in 'Gen 3 Prius Audio and Electronics' started by Frank Roche, Dec 12, 2024.

  1. Frank Roche

    Frank Roche Junior Member

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    So many stereos for cars use resistance to indicate what steering wheel button is selected. For years they require an add on device because Fords used a different resistance chart for each than Toyota, etc and the "adapters made for then were either 'smart" enough to figure it out and convert it or were pre 'programmed" for your car. There were two used by most after market manufacturers.

    Anyway newer units often have an "adapter" built in letting you program the radio to respond to your steering wheel. So does the 2012 (3 rd gen) Prius supplied with a non JBl radio and a non navigation, no rear view camera use resistance to indicate the button pressed on the steering wheel?
     
    #1 Frank Roche, Dec 12, 2024
  2. ChapmanF

    ChapmanF Senior Member

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    I believe so. It's how the 2010 wiring diagram shows it.
     
    #2 ChapmanF, Dec 12, 2024
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  3. Xanxibarbarian

    Xanxibarbarian New Member

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    I'm wondering the same. My 2011 is non JBL non nav, no backup camera. And after installing the new head unit, couldn't figure out SWC. I hooked up my multimeter to all pins on the 20 pin connector, and there was only one pin that showed a resistance change when pushing or touching any button on steering wheel (mine is the trace touch variant), but that resistance change was the same for every button. As I understand, the touch tracer goes into a microcontroller first in the steering wheel before sending signals over wires. No idea which harness i need for this type of steering wheel control configuration.
     
    #3 Xanxibarbarian, Apr 17, 2025
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