DIAGNOSIS FUNCTION
If no keyless operation key ID is registered with KOS&OSS-ECU, or a keyless operation key with unregistered ID is used, the KOS&OSS-ECU sets DTC B2401.
JUDGMENT CRITERIA
If the number of the registered keyless operation keys is 0, or the registration of a keyless operation key fails when the number of the registered keyless operation keys is 0, it is judged as abnormal.