Toyota Corolla (E120): Circuit description

If the ignition switch is turned to the on position, battery positive voltage is applied to the switches, such as terminal ig of the ecu.

Wiring diagram

Inspection procedure

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    Display and menu icons
    ■ Display Driving support system status display area Displays an image when the following systems are operating and a menu icon other than is selected: LTA (Lane Tracing Assist) LDA (Lane Departure Alert) Dynamic radar cruise control RSA (Road Sign Assist) (if equipped) Content disp ...

    Chassis
    On–vehicle inspection 1. Inspect steering linkage  check the steering wheel freeplay .  check the steering linkage for looseness or damage.  Check that the tie rod ends do not have excessive play.  Check that the dust seals and boots are not damaged.  Chec ...

    Evap monitor (vacuum pressure monitor)
    Notice: a cold soak must be performed prior to conducting the drive pattern to complete the internal pressure readiness monitor. Cold soak preconditions The monitor will not run unless: mil is off. Fuel level is approximately 1/2 to 3/4. Altitude is 7800 feet (2400 m) or less. ...