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: perform the troubleshooting of dtc p0335 first. If no trouble is found, troubleshoot the engine mechanical systems. Read freeze frame data using the hand-held tester or the obd ii scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When tr ...

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    Inspection procedure
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