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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    Pre–check
    1. Diagnosis system Release the parking brake lever.  check the warning lights. When the ignition switch is turned on, check that the abs warning light and brake warning light goes on for 3 sec. Hint: when the parking brake is applied or the level of the brake fluid is low, the ...

    Circuit description
    The throttle pressure that is applied to the primary regulator valve (which modulates the line pressure) causes the solenoid valve slt, under electronic control, to precisely and minutely modulate and generate the line pressure according the extent of the accelerator pedal depressed or the o ...

    Circuit description
    The door key lock and unlock switch is built in the door lock motor. Wiring diagram Inspection procedure 1 Check door lock 2 Check wire harness (tvip ecu  door lock) Disconnect the tvip ecu and door lock connectors.  check the continuity between the terminals of the t ...