TECHNICAL DESCRIPTION (COMMENT)
When the power supply mode of the engine switch is turned ON with the keyless operation key (with discharged battery) inserted in the key slot or with the driver's door kept open, KOS-ECU sends the signal to the key slot. The key slot transmits random numbers to the keyless operation key when it receives signals from KOS-ECU. At this time, if an open circuit or short to ground occurs in the wiring harness between KOS-ECU and key slot, KOS-ECU determines that a problem has occurred.