S80 T6 L6-2.9L Turbo VIN 91 B6294T (2002)
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Ignition off
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Disconnect the RTI switch
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Ignition on.
Activate and read off the status of the buttons in the audio / car-phone switch.
If the readings give a correct result, the fault is in the RTI switch.
Other information:
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To access the RTI switch, see RTI switch See: Steering Mounted Controls Assembly/Service and Repair/RTI Switch.
Was the audio / car-phone switch status OK?
Yes - FAULT FOUND
No - Checking components and wiring
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Checking components and wiring