VELOSTER(FS) >2013 > G 1.6 GDI > Body Electrical System > Smart key System>Description and Operation | ![]() ![]() |
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 :
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.
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 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:
The LF antenna
amplifier/driver generates a 125 kHz sinusoidal carrier signal which is
distributed to the different antennas.
Smart
Key FOB
The system supports up
to 2 SMART KEY FOBs.
The main functions of
the SMART KEY FOB are:
Antennas
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 trunk lid.
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.
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 trunk access range is also min. 0.7m measured from the
antenna position.
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
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:
indicates the
operator’s intent to lock the vehicle and thus triggers the system for a
lock.
Passive
Open Tailgate
Pressing the Trunk Lid
Switch when trunk is closed indicates the operator’s intent to open the
trunk 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 “trunk open” message via the CAN
network.
Passive
Trunk Warning
Whenever the trunk is
closed, SMK ECU uses a suitable search strategy to avoid trunk buzzer
warning by a fob outside the vehicle. Then SMK searches for a SMART KEY
FOB in the interior of the trunk. If a valid SMART KEY FOB is found in the
trunk, the SMK ECU activates SMK external buzzer (TBD) to inform the user
that the trunk has been closed with a fob inside the trunk.
SMK will send the
trunk open command to BCM for trunk reopening if Trunk reopening bit is
set(BK)For this functionality, a “valid” SMART KEY FOB means any SMART KEY
FOB that belongs to the vehicle, even if it’s DEACTIVATED.
Smart
Key Reminder 1
Smart
Key Reminder 2
Smart
Key Door Lock Warning
Door
Lock Warning 1
Door
Lock Warning 2
Door
Lock Warning 3
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
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:
User
Information Functions
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, Fob-In signal must be active 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 learnt 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:
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