Toyota Corolla (E170): Using the steering wheel switches to change audio source

The audio source changes as follows each time the “MODE/HOLD” switch is pressed.

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    Inspection procedure
    Hint: troubleshoot each trouble symptom in accordance with the chart below. 1 Clear dtc Connect the hand–held tester or the obd ii scan tool to the dlc 3.  turn the ignition switch on and push the hand–held tester or the obd ii scan tool main switch on.  read the dtc . ...

    Inspection procedure
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    Outside temperature display
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