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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    Precaution
    1. Check that the battery cables are connected to the correct terminals. 2. Disconnect the battery cables when the battery is given a quick charge. 3. Do not perform tests with a high voltage insulation resistance tester. 4. Never disconnect the battery while the engine is running. 5. Check that ...

    Circuit description
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