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
    In the diagram below, when the engine is cranked, current flows from terminal st2 of the ignition switch to the starter relay coil and also current flows to terminal sta of the ecm (sta signal). When the sta signal and ne signal are input to the ecm, tr is turned on, current flows to the c ...

    Replacement
    1. Remove console box sub–assy rear 2. Remove parking brake lever sub–assy Disconnect the parking brake switch connector from the parking brake switch.  remove the lock nut and adjusting nut from the parking brake cable assy no.1. Remove the 2 bolts. Usin ...

    Inspection procedure
    1 Check wire harness(dlc3 – airbag sensor assy center) Turn the ignition switch to the lock position.  disconnect the aribag sensor assy center connector.  measure the resistance according to the value(s) in the table below. Standard: 2 Check wire harness(cg of dl ...