Smart Key Unit (Built-in IPM)

Fig 1: Identifying Smart Key Unit

Courtesy of HYUNDAI MOTOR CO.

The SMK manages all function related to:

"Start Stop Button (SSB) monitoring",
"Immobilizer communication" (with Engine Management System unit for immobilizer release),

"Authentication server" (Validity of Transponder and in case of Smart Key option Passive Fob authentication),
"System consistency monitoring",

"System diagnosis",
Control of display message/warning buzzer.

Fig 2: Smart Key Unit Flow Diagram

Courtesy of HYUNDAI MOTOR CO.

The unit behaves as Master role in the whole system.

In case of SMART KEY application, for example "Passive Access", "Passive Locking" and "Passive Authorization are integrated for Terminal switching Operations".

It collects information about vehicle status from other modules (vehicle speed, alarm status, driver door open...), reads the inputs (e.g. SSB, Lock Button, PARK position Switch), controls the outputs (e.g. exterior and interior antennas), and communicates with others devices via the CAN network as well as a single line interfaces.

The diagnosis and learning of the components of the BES System are also handled by the SMK.