DTC B18CF-00: IAU ECU SPI Error: General Description

IAU (Identity Authentication Unit): The digital key system is a system that can function as door lock/unlock and start-up through smart phone or NFC card key. If a customer register smartphone or NFC card key to the vehicle, the customer can use smartphone and NFC card key to start the drive without having to carry them. The door lock/unlock is equipped with an NFC antenna on the outside door handle and the NFC antenna on the left of the wireless charger is integrated for start-up authentication.

The IAU receives encrypted digital key values from the smartphone and analyze them. In this way, the authentication results transmit to IBU. To enhance IAU-IBU communication security, the IAU-IBU learning are performed with a diagnostic tool.