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03 CTS with Nav... cant access Diag codes

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Instructions linked on this site "reading Diagnostic Codes" don't seem to work.

As suggested, I have pressed the "band" and "nav" buttons together and nothing appears to change on the display???

I tried this with the engine running and with just the ingnition on. I also tried with the nav disc in and out. also with the display power on and off.

Can someone offer more detailed instructions?....... Do the codes appear in the middle of the display screen?

Thanks in advance! :huh:

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