Kia Sorento: Description

Kia Sorento (XM, 2011-2015) Service Manual / Body Electrical System / Button Engine Start System / Description

System Overview

The System offers the following features:

-	Human machine interface through a 1-stage button, for terminal switching and engine start.

-	Control of external relays for ACC / IGN1 / IGN2 terminal switching and STARTER, without use of mechanical ignition switch.

-	Indication of vehicle status through LED or explicit messages on display.

-	Immobilizer function by LF transponder communication between fob and fob holder.

-	Redundant architecture for high system dependability .

-	Interface with Low Speed CAN vehicle communication network.

-	Interface with LIN vehicle communication network depending on platform .

The RKE and SMART KEY functions are not considered part of this Button Engine Start system and are specified in separated system.

System Main Function

-	Switching of ACC / IGN1 / IGN2 terminals.

-	Control of the STARTER relay BAT line (high side) based on communication with EMS ECU.

-	Management of the Immobilizer function.

-	Management of BES warning function.

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.

If the driver press the SSB while prerequisites on brakes, fob authentication and transmission status are satisfied, the BES System will proceed with the locking/unlocking of the steering column, the control of the terminal, and the cranking of the engine.

The driver can release the SSB as soon as this sequence initiated. After positive response from immobilizer interrogation, the system will activate the starter motor and communicate with the EMS to check the engine running status for starter release.

The driver will be able to stop the engine by a short push on the SSB if the vehicle is already in standstill. Emergency engine stop will be possible by a long press of the SSB or 3 consecutive presses in case the vehicle is in ENGINE RUNNING.

If the conditions for engine cranking are not satisfied while a push on the SSB is detected and a valid fob authenticated, the system will unlock the steering column and switch the terminals to IGN. Another push on the SSB will be necessary to start the engine.

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 insert the fob into the fob holder.

Circuit Diagram (2)

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Start/Stop Button Component

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Kia Sorento: Description

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Manuals list