Voice Communication Does Not Work (With Climate Control)

Voice communication does not work

Probable cause: Communication problem between the climate control unit and the navigation system
Do the navigation communication line circuit troubleshooting Navigation Communication Line Circuit Troubleshooting (With Navigation)

Also check for

Climate control DTCs How To Troubleshoot The Climate Control System

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Navi System Link, '07-09 models, '10 model Navigation System Diagnostic Mode

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Cleanliness and tightness of all terminals