Kia Sorento: Description and Operation

Description

System Overview

System characteristics :

–	Changing the state of power by using the start button.

–	Controlling external relays for ACC / IG1 / IG2 terminal switching and STARTER, without use of mechanical IG switch.

–	Indicating the vehicle status on cluster by displaying messages.

–	Immobilizer function by LF transponder communication between fob and button start switch.

–	Interface with Low Speed CAN vehicle communication network.

–	Interface with LIN vehicle communication network depending on platform.

System Main Function

•	Switching of ACC/IG1/IG2 terminal.

•	Control of the STARTER relay based on communication with Vehicle Control Unit (VCU).

•	Management of the Immobilizer function.

•	Management of Button Start System warning function.

Wireless Communications

The electric signal is used to exchange information between vehicle and FOB key. For now, button start is applied with smart key FOB key together.

Smart key function is explained separately so refer to the corresponding system contents.

System Flow Chart

*SSB : Start Stop Button

Schematic Diagram

Body Domain Control Unit (BDC)

Body domain control unit function :

–	Start/Stop Button (SSB) control

–	Immobilizer communication (with VCU for releasing immobilizer)

–	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

Limp Home Mode

–	In case of no input signal for the brake switch, the ACC mode shall cycle to “START” by pressing SSB for more than 10 seconds.

–	In case of problems with communication between VCU and CAN (the VCU state), the “START” state cycles to the “EV Ready” based on rpm input.

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In case that one out of two SSB input lines is disconnected, the electric power cycling is available when SSB is pressed twice within 10 seconds.

The buzzer rings when the button is pressed for the first time.

Electric power cycling is available and buzzer stops when the button is pressed twice within 10 seconds.

Terminal and Starter Relay

Relay is used to switch the terminal ACC / IG1 / IG2.

Normally-open relay is operated by smart key unit.

One relay coil is connected to output terminal of IBU.

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Removal 1. Remove the crash pad center panel. (Refer to Body - "Crash Pad Center Panel") 2. ...

Manuals list