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Hi Everybody,

I'm not entirely sure how to word this, let alone search for it, so forgive me if it's a common issue.

Couple years back, I had an aftermarket Pioneer deck with a PAC SWI-PS and C2R-CHY4 installed in my 2005 300c. Over the years, the function of the steerwheel controls has jumped around. For example volume up is currently next input. Next track is volume down. In the past they may have went wonky for a bit but eventually went back to right.

Lately, they've stayed incorrect and I have no way to raise volume or go next song which is surprisingly annoying.

Is this a common issue?
Is there a simple fix?
If the fix is buying a replacement SWI-PS - is PAC still the best way to go? Are there other options?
 

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It sounds as if the swi has lost it's original settings. You could try reprogramming it, but I'm afraid it may continue to lose it.

I'd recommend replacing the harness as well. Get the PAC RP4-CH11, which would replace both the SWI and CHY4 that you currently have.

The RP4 has preset programming and all you'd need to do is move the selection to match your head unit. Much cleaner and less likely to lose the setting.
 
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