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2009 cts radio no sound

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my radio and cd changer function properly ,but i have no sound from them or no chimes. the cadillac dealer tested and said the amp was bad. i replaced it and still nothing, then i put in a used identical replacement radio and un locked it and still nothing i'm thinking about bypassing the amp on one of the speakers to see what happens. Any help would be greatly appreciated. note the amp and radio both have been tested and are both good.


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  • 3 weeks later...

Boy, I’m sorry to hear of your trouble with this! Sounds like you’ve got a serious gremlin somewhere there in your audio system! 

This may be totally unrelated, but I thought I’d mention it just in case it opens up a discussion or someone else has a similar problem that could further help you diagnose this... My 2009 CTS will sometimes lose the audio output on all options (radio, CD & Hardrive) if I use my phone immediately after I start the car. Maybe cause it’s still syncing up with Bluetooth? Most times I can get it to work again by shutting the car off for a few minutes, but occasionally it has to sit for hrs? Just crazy! 🙄

'09 Cadillac CTS-4 3.6 direct injection, 128 K mi.
'15 Chevy Tahoe LTZ, 5.3i V8, 125 K mi
'70 Firebird Formula 400, Bored+.04, RAIII heads, M21 4spd., in-process restoration!

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