Smart Key Unit

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
• Control of SSB LEDs (illumination, clamp state)

The smart key unit masters the entire button engine start system.

It collects information about vehicle status from other modules (vehicle speed, alarm status, driver door open...), reads the inputs (e.g. SSB, Capacitive Sensor/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 SMK manages the functions related to the "terminal control" by activating external relays for ACC, IGN1 and IGN2. This unit is also responsible for the control of the STARTER relay.

The SMK is also controlling the illumination of the SSB as well as the "system status indicator", which consists of 2 LEDs of different color. The illumination of the fob holder is also managed by the SMK.

The SMK reads the inputs (Engine fob in, vehicle speed, relays contact status), controls the outputs (Engine relay output drive), and communicates with others devices via the CAN.