Toyota Corolla (E120): Circuit description

When the cruise control main switch assy button is turned to on, cruise main indicator light comes on.

Wiring diagram

Wiring diagram

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    Circuit description
    When the ignition switch is turned on, battery positive voltage is applied to the coilwhich closes the contacts of the efi main relay (marked: efi) and supplies power to terminal +b of the ecm. This signal causes current to flow to the coil, closing the contacts of the efi relay and supplyin ...