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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    Circuit description
    This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the signal from the ecu. If a malfunction occurs in the actuator or speed sensor, etc. During cruise control operation, the rotor shaft between the motor and control plate is released. ...

    Initialization
    1. Reset memory Caution: perform the reset memory (at initialization) when replacing the automatic transaxle assy, engine assy or ecm. Notice: hand–held tester only Turn the ignition switch off.  connect the hand–held tester to the dlc3.  turn the ignition switch to th ...

    Windshield/windowglass/mirror
    Preparation Recomended tools Equipment Ssm ...