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