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Audio steering wheel buttons - HELP!


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Can you help? I have this Jap navi/stereo in my car

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I added the audio buttons to the steering wheel.

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You guessed it, buttons don't work. I did some Googling but all the plugs seem different!

I was expecting a white 20 pin plug into the HU but seem to have 13 (14 with one pin missing)with something which looks like an adapter to a black plug which goes into the HU. Since there are two wires for the steering wheel controls and all the pins are wired-up I assume there is an electrical link to the buttons but the HU isn't responding to the signal but really don't understand any of this stuff. Any ideas?!

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Thanks Sobanoodle. I think DIY brain surgery would be easier. Those links were some help but don't quite get me there. I am going to have to pull it all out again to see what those highlighted wires do. Might even be a way to disable that annoying Japanese greeting which would be a bonus! I think I can use a multimeter to see if resistance changes when buttons pressed. Just can't seem to find complete information on what each of those connectors is for. But violet/white seems to be a standard steering wheel control colour...

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Some progress. Those three wires go directly to an unused white plug under the steering column where they are spliced into other wires which appear to head for the steering wheel. Next step is to follow where they go. I did try pressing the buttons to see if there was a resistance change at the radio end but alas no so maybe they are not connected to the audio switches at all.

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