TECHNICAL DESCRIPTION (COMMENT)
When the electric motor switch power supply mode is set from OFF to ON or the driver’s door is opened with the electric motor switch power supply mode at OFF after the battery-discharged keyless operation key is inserted into the key slot, the KOS-ECU will send a signal to the key slot. Then the key slot will send a code to the keyless operation key via its antenna. If the KOS-ECU detects open circuit or short circuit to ground consecutively four times during the operation above, the ECU will store this diagnostic trouble code.