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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    On–vehicle inspection
    1. Inspect drive belt Visually check the belt for excessive wear, frayed cords, etc. If any defect is found, replace the drive belt. Hint: cracks on the rib side of a belt are considered acceptable. If the missing chunks from the ribs are found on the belt, it should be replaced. 2 ...

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