S60 L5-2.4L VIN 64 B5244S6 (2003)
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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 / carphone 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 the relevant service procedure.
Was the audio / carphone switch status OK?
Yes - Fault Found
No - Checking components and wiring
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Checking components and wiring
