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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    How to proceed with troubleshooting
    The hand–held tester can be used at step 3, 4, 5, 7, 10. 1 Vehicle brought to workshop 2 Customer problem analysis 3 Connect hand–held tester to dlc3 Hint: if the display indicates a communication fault in the tool, inspect dlc3. 4 Check dtc and freeze frame data Hint: record or pr ...

    Overhaul
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    Circuit description
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