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Button Engine Start System

The Button Start System allows the driver to operate the vehicle by simply pressing a button (called as SSB) instead of using a standard mechanical key.

When the driver pushes the SSB, upon authentication of the smart key, if the brake signal and the shift signal (P) have been received correctly, the SMK System will proceed with the unlocking of the steering column, the control of the terminal, and enable READY mode.

The driver can release the SSB as soon as this sequence is initiated. After positive response from immobilizer authentication, the system will communicate with the VCU, turn on the READY lamp and put the vehicle to "standby" mode to drive.

The driver can shut-off the EV by pushing the SSB button once in a standstill position or shift position on either P or N. Emergency engine stop can be made by long-pressing the SSB button or by consecutively pressing 3 times in vehicle READY mode.

If the conditions for READY mode are not met while detecting a push on the SSB or authenticating a valid fob, the system will unlock the steering column and switch the terminals to IGN. In this case, another push on the SSB is needed to enter READY mode.

In case of a vehicle equipped with SMART KEY system, fob authentication will not require any action from the driver. For limp home start or in case of vehicle without SMART KEY, the driver will have to push the start/stop button.

Fig 1: Button Engine Start System Communication Diagram
G10727910Courtesy of KIA MOTORS AMERICA, INC.