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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    Basic inspection
    Resistance measuring condition of electronic parts  unless stated, all resistance is measured at an ambient temperature of 20 c (68 °F). As the resistance may be outside the specifications if measured at high temperatures immediately after the vehicle has been running, measu ...

    Indicators
    The indicators inform the driver of the operating state of the vehicle’s various systems. *1: Vehicles without a smart key system: These lights turn on when the engine switch is turned to the “ON” position to indicate that a system check is being performed. They will turn off after the ...

    RCTA (Rear Cross Traffic Alert) function
    The RCTA function uses the BSM rear side radar sensors installed behind the rear bumper. This function is intended to assist the driver in checking areas that are not easily visible when backing up. WARNING ■Cautions regarding the use of the system The driver is solely responsible for safe driving ...