Smart Key System Hyundai Santa Fe III

Smart Key Unit

RF Receiver

Smart Key Fob

Antenna

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Description

The SMART KEY system is a system that allows the user to access and operate a vehicle in a very convenient way. To access the vehicle, no traditional key or remote control unit is needed.

The user carries a SMART KEY FOB which does not require any conscious actions by the user (e.g. operate a RKE button). The SMART KEY system is triggered by pressing a push button in the door handle.

After being triggered the vehicle sends out a request in a limited range. If the SMART KEY FOB receives this request, it automatically sends a response to the vehicle. Then the system decides whether to perform a particular action (unlocking, locking...) or remain inactive.

Again, a communication between the vehicle and the SMART KEY FOB is needed before any actions will be performed.

The System offers the following features

1. Passive unlock via door driver side and passenger side
2. Passive locking via door driver side and passenger side
3. Passive start
4. Passive access trunk via the trunk lid switch at the trunk
5. Passive locking via tailgate
6. Max. 2 fobs can be handled by the system
7. Immobilizer backup antenna driver integrated into SSB for TP authentication (i.e. limp home mode)
8. Communication with engine management system
9. Communication with SRX
10. LF-RF communication

1. Passive unlock The system allows the user to access (unlock) the vehicle without performing any actions with the SMART KEY FOB. This feature could be different depending on platform as follows: Pressing Push button in door handle
2. Passive locking The system allows the user to lock the vehicle by pushing a button on door handle with the SMART KEY FOB.
3. Button start The system allows to switch the power modes (Off, Accessory, Ignition), as well as to start and stop the vehicle's engine without performing any actions with the SMART KEY FOB. See Button Engine Start system specification.
4. LIMP HOME Mode Additionally, the system offers so called "limp home mode", which is the user can operate all vehicle functions by pushing the key into the SSB.

Smart Key ECU (SMK ECU)

The SMK ECU manages all functions related to "Passive Unlock", "Passive Lock" and "Passive Authorization for Engine Start Operation".

It reads the inputs (Push button in door handle, Start Stop Button (SSB), PARK position Switch), controls the outputs (e.g. exterior and interior antennas), and communicates via the CAN/LIN (depends on the vehicle) as well as a single line interface to further devices of the car.

For communication with the SMART KEY FOB, SMK ECU generates a request (challenge) as an encoded and modulated 125 kHz signal at the inductive antenna outputs and receives the SMART KEY FOB's response via the external RF receiver.

The main functional blocks of the SMK ECU are

1. Power supply
2. Microcontroller with FLASH Memory
3. Single Line Interface to SRX
4. Single Line Interface to EMS
5. Input stage
6. LF antenna amplifier/driver
7. CAN communication with BCM
8. LIN communication with other unit (depending on platform)

The LF antenna amplifier/driver generates a 125 kHz sinusoidal carrier signal which is distributed to the different antennas.

The system supports up to 2 SMART KEY FOBs.

The main functions of the SMART KEY FOB are

1. Passive functionality: receives LF-challenge and sends automatically RF response.
2. Classic RKE function by action up to 4 push buttons.
3. Transponder-functionality in case of a flat battery or a disturbed communication.
4. LED for operation feedback and battery monitoring.

Note. The FOB's LED indicator may continue to light even with a low transmitter battery. If the performance or range of the FOB is less than expected, check the transmitter battery.

Antennas

1. Emitting LF Antennas: Inductive antennas in and at the vehicle are used to transform the current, driven by the SMK ECU antenna driver, into a 125 kHz magnetic field, which is the carrier for the SMART KEY challenge. Three antennas cover the vehicle's exterior: two antennas in the Door Handles (DS and PS) cover the area around the doors; one antenna in the rear bumper covers the area around the trunk. Up to three antennas cover the vehicle's interior: two in the passenger compartment and one in the tailgate.
2. Bidirectional Immobilizer Antenna (for Limp Home): The Immobilizer Backup Antenna is used for sending and receiving data: it emits a magnetic field (125 - 135 kHz challenge) and receives changes in the field strength (response of Transponder).

Door Handle

The front door handles of the two doors (driver door/passenger door) are equipped with emitting LF-antennas to emit the 125 kHz signals. The front door handles are also equipped with a push button.

Push Button

The push button in door handle serves as a trigger to indicate the user's intent to unlock or lock the vehicle.

The push buttons are installed at front doors, integrated into the door handles.

Another button is installed at the tailgate garnish.

Passive Functions

The system allows the user to access the vehicle without having to perform any actions (e.g. RKE button pressing) with the SMART KEY FOB. It is sufficient that a valid SMART KEY FOB is located within a defined and limited range with respect to the vehicle. So the system is capable of detecting and authenticating a SMART KEY FOB in the ranges as specified below.

Operating Range

The SMART KEY FOB receives and interprets a challenge sent from the vehicle via the exterior antennas in a free space range of min. 0.7m measured around the exterior antennas which are integrated in the door handles; refer to the below given picture. The tailgate access range is also min. 0.7m measured from the antenna position.

Passive Access (Passive Entry)

Pressing one of the push buttons in the door handles when all doors locked indicates the operator's intent to access the vehicle and thus triggers the system for unlock

Passive Locking (Exit)

Pressing one of the push buttons in the door handles when one of the following condition is fulfilled

1. At least one door is unlocked and two_steps timer is not running or
2. Two_steps timer is running and one of the push button except Front Left side is triggered indicates the operator's intent to lock the vehicle and thus triggers the system for a lock.

Passive Open Tailgate

Pressing the tailgate release switch when tailgate is closed indicates the operator's intent to open the tailgate and thus triggers the system.

Subsequently, the SMK ECU sends a LF-challenge to the SMART KEY FOB via the exterior bumper antenna. The SMART KEY FOB answers with a RF-response. If the received response matches the expected answer, SMK ECU sends a "tailgate open" message via the CAN network.

Smart Key Reminder 1

1. Preconditions: All terminals OFF & at least one door open & locking status is not locked checked by SMK periodically every 100ms, as long as CAN/LIN active.
2. Event: At least 1 door knob status changed from unlock to lock.
3. SMK actions: IF NO FOB-IN ACTIVE SMK performs a search for the fobs in the interior of the vehicle. The same LF-strategy has to be used as it is defined for the ID out warning (registering only, no authentication) IF FOB-IN ACTIVE SMK searches valid TP If no fob or no TP has been found, no action is required. If any valid fob or valid TP has been found, SMK unlocks the vehicle by sending a CAN Key Reminder unlock message with the fob number. If any valid fob has been found, SMK unlocks the vehicle by sending a CAN/LIN Key Reminder unlock message with the fob number.

Smart Key Reminder 2

1. Preconditions: All terminals OFF & any door (including tailgate) open & no FOB-IN & no locking status (checked by SMK periodically every 100ms, as long as CAN/LIN active)
2. Vehicle action: Closing last door or tailgate with knobs locked state, or with a locking in progress
3. SMK actions: Before elapsing 500ms after the closing if all doors are locked then: IF NO FOB-IN ACTIVE SMK performs a search for the fobs in the interior of the vehicle. The same LF-strategy has to be used as it is defined for the ID out warning (registering only, no authentication) IF FOB-IN ACTIVE SMK searches valid TP If no fob has been found, no action is required. If any valid fob or valid TP has been found, SMK sends unlock command via CAN and activates ext. buzzer warning. If any valid fob has been found, SMK sends unlock command via CAN/LIN and activates ext. buzzer warning.

Door Lock Warning 1

1. Preconditions: While (at least one door knob is unlocked) & (ACC ON or IGN ON) & (No FOB-IN): (All doors are closed) & (tailgate closed)
2. Event: User presses the push button in door handle or tailgate
3. SMK actions: SMK performs a search for the fobs outside of the vehicle; the same LF-strategy has to be used as it is defined for "Scenario Access with I/O Distinction". Buzzer is ON when the valid FOB is detected.

Door Lock Warning 2

1. Preconditions: Same as passive locking precondition but with at least one door open.
2. Event: User presses the door handle Push button.
3. SMK actions: SMK performs a search for the fobs outside of the vehicle; the same LF-strategy has to be used as it is defined for "Scenario Access with I/O Distinction". If no fob has been found, no action is required. If the preconditions are no longer valid during buzzer active time (3 seconds), the SMK ECU stops the buzzer immediately.

Door Lock Warning 3

1. Preconditions: Same as passive locking precondition
2. User action: User presses the door handle Push button
3. SMK ECU actions: If ATWS (Anti Theft Warning System) is in DISARM status, SMK ECU performs a search for the fob inside of the vehicle (use "Door Lock Warning 3" scenario)

If no fob has been found, the passive locking is performed.

If any valid fob has been found, SMK ECU activates the external buzzer.

If the activity timer elapsed or ACC ON or IGN1 ON or NOT All door closed or FOB-IN, the SMK ECU stops the buzzer immediately.

After searching of inside fob, SMK ECU also performs a search for fobs outside of the vehicle.

Smart Key Lamp Warning

1. SMK actions: As long as the preconditions are valid, the SMK ECU performs a periodical search for the fobs in the interior of the vehicle; the same LF-strategy has to be used as it is defined for the ID out warning (registering only, no authentication); periodical means, the search is done every 3 seconds. If no fob has been found, the SMK ECU starts Key out indicator lamp activation as all preconditions are valid and will perform another search 3 seconds later.

If any valid fob has been found, the SMK ECU stops the Key out indicator lamp and will (if one door is open) perform another search 3 seconds later; if no door is open then it's only at the next When the preconditions are still valid, the search resumes by opening of one door.

Failsafe Functions (Backup For Limp Home)

In case of a discharged battery of the SMART KEY FOB or disturbed transmission, the following functions are available

1. Unlocking/locking of doors or tailgate (or tailgate depending of the vehicle configuration): use of mechanical key

ID OUT Warning

1. Preconditions: (ACC or IGN1) & (any door open or tailgate open)
2. Event: The last opened door is closed
3. SMK action: SMK searches for a SMART KEY FOB in the interior. If no valid SMART KEY FOB is found, the SMK activates external buzzer and also sends ID OUT warning via CAN (exterior buzzer warning and internal buzzer warning). If a door is opened and closed again during terminals on and inside valid fob, SMK re-enables the authentication and stops the warning. If the terminal is in ACC, SMK shall turn on immobilizer lamp. NOTE: If there is a LF error (LF overheating or LF antenna failure), the system will have the same behavior as it is with no fob found.

Immobilizer Lamp

Removing the PIF from the MSL and reinserting the PIF and pushing the MSL Knob will switch the lamp on again.

Fob Battery Low Voltage Detection

To detect fob low battery condition, certain battery voltage measurement and low voltage detection strategy are implemented into fob. The measurement of the battery voltage will be done if fob button is pressed or if a LF measurement command is received.

If the fob has detected a low battery voltage, the LED will not be switched on at button press.

Learning Description

In this chapter, the learning procedure for SMK, FOBs is described.

For the learning of the SMK, FOBs, it's necessary to have a connection to the diagnostic tool.

Learning MODE

Whatever the mode, the learning procedures are managed by the SMK.

Prior to start learning service, have the FOB and the vehicle secret code (called as PIN code) should be known.

Teaching MODE

This mode is used by the dealers in order to replace SMK and/or the set of keys, or to register additional keys for an existing system. That means the system already has been learn with certain PIN Code. The PIN Code is fixed for the life time of the vehicle, therefore the same PIN Code must be used in this mode. Otherwise learning will be failed

Teaching MODE Procedure Description (Step By Step)

Objective: Key teaching procedure at service station

Initial state

1. SMK replacement: SMK is not learn, SMART FOB are already learn with same PIN code
2. Additional or new keys teaching: SMK is already learn with same PIN code

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1. Connect the DLC cable of GDS to the data link connector (16 pins) in driver side crash pad lower panel, turn the power on GDS.
2. Select the vehicle model and then do "Smart key code saving".
3. After selecting "Smart key teaching" menu, push "Enter" key, then the screen will be shown as below.
4. After having the teaching smart key, push "ENTER" key.
5. Input the "Pin code" for first key teaching.
6. Press the SSB with smart key within 5 sec after pressing "OK".
7. Confirm the message "First key teaching completed".
8. Press the SSB with smart key within 5 sec after pressing "OK".
9. Confirm the message "Second key teaching completed".
10. Then the screen will be shown as below when key teaching process is completed.

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Connector Pin Information

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1. Disconnect the negative (-) battery terminal.
2. Remove the driver crash pad lower panel. (Refer to " «CRASH PAD LOWER PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/gauges-instrument-panels/#crash-pad) ")
3. Remove the smart key unit (B) after loosening the mounting bolts (2EA) and disconnecting the connector (A).

Note. Take care not to scratch the crash pad and related parts.

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1. Disconnect the negative (-) battery terminal.
2. Remove the crash pad center panel. (Refer to «CRASH PAD CENTER PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/gauges-instrument-panels/#crash-pad) .
3. Remove the RF receiver after loosening the mounting nut (1EA) and disconnecting the connector.

Interior 1 Antenna

Note. Take care not to scratch the crash pad and related parts.

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1. Disconnect the negative (-) battery terminal.
2. Remove the crash pad center panel. (Refer to «CRASH PAD CENTER PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/gauges-instrument-panels/#crash-pad) .
3. Remove the interior 1 antenna (B) after loosening the mounting nuts (2EA) and disconnecting the connector (A).

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1. Disconnect the negative (-) battery terminal.
2. Remove the console rear complete assembly. (Refer to " «[CONSOLE REAR COMPLETE ASSEMBLY]»(/hyundai/santa-fe/iii-2012-2016/remont/exteriorinterior-trim/#floor-console__console-rear-complete-assembly) .
3. Remove the interior 2 antenna (B) after loosening the mounting bolts (2EA) and disconnecting the connector (A).

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1. Disconnect the negative (-) battery terminal.
2. Remove the luggage covering mat (A).
3. Remove the luggage floor box (A) after loosening the screws (4EA).
4. Remove the luggage tray box (A).
5. Remove the floor mat (A) after loosening the screws (4EA).
6. Remove the interior 3 antenna (B) after loosening the mounting nuts (2EA) and disconnecting the connector (A).

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1. Disconnect the negative (-) battery terminal.
2. Remove the rear bumper cover. (Refer to " «REAR BUMPER COVER»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#rear-bumper) ")
3. Disconnect the antenna connector (A) on the center of rear bumper.
4. After loosening the nuts (2EA), remove the exterior bumper antenna (B).

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1. Disconnect the negative (-) battery terminal.
2. Remove the front left wheel guide.
3. Disconnect the connectors, then remove the buzzer (A).

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1. Disconnect the negative (-) battery terminal.
2. Remove the door outside handle cover (A) after separating the plug hole (B) from the door and loosening the mounting bolt.
3. Remove the outside handle (A) by sliding it rearward.
4. Disconnect the door outside handle connector (A).

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1. Disconnect the negative (-) battery terminal.
2. Remove the tailgate trim. (Refer to «TAIL GATE TRIM»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#tail-gate) .
3. Remove the tailgate back panel. (Refer to «TAIL GATE BACK PANEL»(/hyundai/santa-fe/iii-2012-2016/remont/exterior-body-panels/#tail-gate) .
4. Loosen the tailgate switch mounting screws (2EA).
5. Remove the tailgate switch (A) after separating the license lamp wiring.

Refer to Smart Key System - " SMART KEY DIAGNOSTIC "

Smart Key Switch

Refer to Smart Key System - " SMART KEY DIAGNOSTIC "

Refer to Smart Key System - " SMART KEY DIAGNOSTIC "

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1. Check for continuity between the tailgate latch terminals.
2. If continuity is not specified, inspect the switch

1. Install the smart key unit.
2. Install the smart key unit mounting bolts and connect the connector.
3. Install the driver side crash pad lower panel.
4. Install the negative (-) battery terminal and check the smart key system.

1. Install the RF receiver.
2. Install the RF receiver mounting nut and connect the connector.
3. Install the crash pad center panel.
4. Install the negative (-) battery terminal and check the smart key system.

1. Install the interior 1 antenna.
2. Install the crash pad center panel.
3. Install the negative (-) battery terminal and check the smart key system.

Interior 2 Antenna

1. Install the interior 2 antenna.
2. Install the console rear complete assembly.
3. Install the negative (-) battery terminal and check the smart key system.

Interior 3 Antenna

1. Install the interior 3 antenna.
2. Install the floor mat, the luggage tray box, the luggage floor box and luggage covering mat.
3. Install the negative (-) battery terminal and check the smart key system.

Exterior Bumper Antenna

1. Install the exterior bumper antenna.
2. Install the rear bumper cover.
3. Install the negative (-) battery terminal and check the smart key system.

Buzzer

1. Install the buzzer.
2. Install the front left wheel guide.
3. Install the negative (-) battery terminal and check the smart key system.

Door Outside Handle

1. Install the outside handle.
2. Install the door trim.
3. Install the negative (-) battery terminal and check the smart key system.

Tailgate Switch

1. Install the tailgate switch.
2. Install the tailgate garnish.
3. Install the tailgate trim.
4. Install the negative (-) battery terminal and check the smart key system.

Self Diagnosis With Scan Tool

It will be able to diagnose defects of SMART KEY system with GDS quickly. GDS can operates actuator forcefully, input/output value monitoring and self diagnosis.

The following three features will be major problem in SMART KEY system.

1. Problem in SMART KEY unit input.
2. Problem in SMART KEY unit.
3. Problem in SMART KEY unit output.

To diagnose, the three major possible problems.

1. SMART KEY unit Input problem: switch diagnosis
2. SMART KEY unit problem: communication diagnosis
3. SMART KEY unit Output problem: antenna and switch output diagnosis

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel, turn the power on GDS.
2. Select the vehicle model and then SMART KEY system.
3. Select the "SMART KEY unit".
4. After IG ON, select the "Current data".
5. You can see the situation of each switch on scanner after connecting the "current data" process. Display Description FL Toggle SW ON: Push button is ON in the driver door handle. FR Toggle SW ON: Push button is ON in the assist door handle. Tailgate open SW ON: Tailgate button is ON. Gear P Position ON: Shift lever is P position. IGN 1 ON: IGN switch is IG position. ACC ON: IGN switch is ACC position. Brake SW ON: Brake switch is ON.

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1. Communication diagnosis checks that each linked components operates normal.
2. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
3. After IG ON, select the "DTC".

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. After IG ON, select the "ACTUATION TEST".
3. Set the smart key near the related antenna and operate it with a GDS.
4. If the LED of smart key is blinking, the smart key is normal.
5. If the LED of smart key is not blinking, check the voltage of smart key battery.
6. Antenna actuation INTERIOR Antenna 1 INTERIOR Antenna 2 INTERIOR Antenna 3 BUMPER/Trunk Antenna DRV_DR Antenna AST_DR Antenna

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. Select the "Antenna Status Check".
3. After IG ON, select the "Antenna Status Check".
4. Set the smart key near the related antenna and operate it with a GDS.
5. If the smart key runs normal, the related antenna, smart key (transmission, reception) and exterior receiver are normal.
6. Antenna status INTERIOR Antenna 1 INTERIOR Antenna 2 INTERIOR Antenna 3 BUMPER/Trunk Antenna DRV_DR Antenna AST_DR Antenna

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. Select the "Serial Communication Line Check".
3. After IG ON, select the "Receiver Communication Line Check".
4. Check the serial communication line with a GDS.
5. If the smart key runs normal, the communication of smart key unit and exterior receiver are normal.
6. If the smart key runs abnormal, check the following items. Disconnection or no response of the exterior receiver communication line. The exterior receiver communication line disconnection and ground connection.

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1. Set the smart key in the following shade area and turn the IG ON.
2. If the ignition is ON, the antenna runs normal.
3. Check the interior antenna ignition mode.
4. Set the smart key in the following shade area and actuate the antenna. Check the LED of smart key is blinking.
5. If the LED of smart key is not blinking, check the antenna in shade area.

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. After IG ON, select the "FOB KEY STATUS INFO".

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. After IG ON, select the "SMK STATUS INFO".

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1. Connect the cable of GDS to the data link connector in driver side crash pad lower panel.
2. After IG ON, select the "Neutralization mode".

Input Switch List

Actuator List

See also:
• CRASH PAD LOWER PANEL
• [CONSOLE REAR COMPLETE ASSEMBLY]
• REAR BUMPER COVER
• TAIL GATE TRIM
• SMART KEY DIAGNOSTIC