VERACRUZ(EN) >2013 > G 3.8 DOHC > Body Electrical System > Smart key System>Description and Operation | ![]() ![]() |
The 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 K FOB which itself does not
require any conscious actions by the user (e.g. operate a 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.In a similar
manner the vehicle's Mechatronic Steering Lock (MSL) is released. Again, a
communication between the vehicle and the SMART KEY FOB is needed before
any actions will be performed.
Scope
Of Smart Key System
The System offers the
following features :
Passive
Functions
The system allows the
user to access the vehicle without having to perform any actions (button
pushes) 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.
Passive
Access (Passive Entry)
If user press Front
left side push button, when all doors locked (that includes tail gate if
tail lock bit set) indicates the operator's intent to access the vehicle
and thus triggers the system for unlock and two steps timer is started. If
user press Front left side push button one more time while the two steps
timer is still running, then system is triggers for a second
unlock.Pressing front right side push button in the door handle when all
doors are locked indicates the operator's intent to access the vehicle and
thus triggers the system for an unlock.Subsequently, the SMK ECU sends a
LF-challenge to the SMART KEY FOB via the corresponding exterior antenna.
The SMART KEY FOB answers with a RF-response. If the received response
matches the expected answer, the SMK ECU issues an "unlock" message to the
BCM module via the CAN/LIN network.
Passive
Locking (Exit)
Pressing one of the
push buttons in the door handles when (at least one door unlocked and two
steps timer not running) or (two steps timer 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
Access Trunk
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, the SMK ECU sends a "trunk open" message via the
CAN/LIN network.Special case: If the car is locked, but the ATWS is not
armed, LF strategy shall search for FOB at the bumper area excluding trunk
and interior area.
Passive
Open Tailgate
Pressing the Tailgate
Lid Switch when tail gate 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, the SMK ECU sends a "tailgate open" message
via the CAN/LIN network.
Smart
Key Reminder 1
Preconditions : All
terminals OFF and at least one door open and no Key-In and locking status
is not locked (to be checked by SMK ECU periodically every 100ms, as long
as CAN/LIN active)
User action : At least
1 door knob status changed from unlock to lock.
Vehicle action :
locking status changes from unlock to lock.
SMK ECU actions : the
SMK ECU 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 no fob has been found, no action
is required.If any fob has been found, the SMK ECU unlocks the vehicle by
sending a CAN/LIN passive unlock message with the fob number.
Smart
Key Reminder 2
Preconditions : All
terminals OFF and any door (including tail gate) open and no Key-In and
locking status is not locked (to be checked by SMK ECU periodically every
100ms, as long as CAN/LIN active)
User action : All
doors and tail gate closed.
Vehicle action :
Closing last door or tail gate with knobs state locked, or with a locking
in progress
SMK ECU actions : if
within 500ms following the closing, all doors are locked then SMK ECU
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 no fob has been found, no action
is required.If any fob has been found, the SMK ECU unlocks the vehicle and
activates ext. buzzer warning.
Smart
Key Door Lock Warning
Door
Lock Warning 1
If (TAIL BIT is not
set) AND (TAIL BIT is set & TAIL LOCK BIT is not set), this warning
can be triggered when below conditions are fulfilled.
Preconditions : (All
doors are closed) and (ACC ON or IGN1 ON) and no Key in User action : user
presses the door handle Push button.SMK ECU actions: the SMK ECU performs
a search for the fobs outside of the vehicle; the same LF-strategy has to
be used as it is defined for Passive Access Door Unlock.
If TAIL LOCK BIT is
set, this warning can be triggered when below conditions are
fulfilled.Preconditions : (All doors are closed) AND (Tailgate is closed)
and (ACC ON or IGN1 ON) and no Key in
User action : user
presses the door handle Push button OR tailgate Push button.SMK ECU
actions : the SMK ECU performs a search for the fobs outside of the
vehicle; the same LF-strategy has to be used as it is defined for Passive
Access Door Unlock.
If no fob has been
found, no action is required.If any fob has been found, the SMK ECU
activates the external buzzer.If the preconditions are no longer valid
during buzzer active time (3 seconds), the SMK ECU stops the buzzer
immediately.
Door
Lock Warning 2
Preconditions : Same
as passive locking precondition but with at least one door openUser action
: user presses the door handle Push button or (tailgate push button if
TAIL LOCK BIT set)SMK ECU actions : the SMK ECU performs a search for the
fobs outside of the vehicle; the same LF-strategy has to be used as it is
defined for Passive Access Door Unlock.
If no fob has been
found, no action is required.If any fob has been found, the SMK ECU
activates the external buzzer.If the preconditions are no longer valid
during buzzer active time (3 seconds), the SMK ECU stops the buzzer
immediately.
Door
Lock Warning 3
Preconditions : Same
as passive locking preconditionUser action : user presses the door handle
Push button OR Tailgate push button if TAIL LOCK BIT setSMK ECU actions :
If ATWS is DISARM, SMK ECU performs a search for the fobs inside of the
vehicle (use "Door Lock Warning 3" scenario)If any 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 Key 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
Preconditions : (ACC
ON or IGN1 ON) and no Key-In and CAN-Bit "3km" not setUser action :
noneSMART KEY 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 has to be started all 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 an other search 3 seconds later.If any fob has been
found, the SMK ECU stops the Key out indicator lamp and will (if one door
is open) perform an other search 3 seconds later; if no door is open then
it's only at the next opening of one door if the condition are still valid
that the search will be resumed.
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
If at least one door
open and the last door will be closed and the terminals are not 'Off', the
SMK ECU searches for a SMART KEY FOB in the interior. If no valid SMART
KEY FOB is found the SMK ECU generates a corresponding warning and sends
by CAN/LIN request for internal buzzer activation (exterior buzzer warning
and internal buzzer warning). If a door will be opened and closed again
during terminals on and a valid fob will be found then within the vehicle,
the SMK ECU re-enables the authentication and stops the
warning.
ID
Not Found For Passive Start
For the passive start
functionality (not for the limp home start), an ID has to be detected in
the interior of the vehicle. If no valid SMART KEY FOB is found, the SMK
ECU starts an immobilizer interrogation in the MSL; if also the
immobilizer interrogation fails, the SMK ECU activates the immo
lamp.
MSL
Not Blocked Warning
If no fob is inserted
and ACC off and IGN1 off and the MSL is not blocked (MSL blocked switch in
MSL) or at the time of the MSL not block warning strategy the status is
unknown while the last command was a block command and the driver door is
open, the SMK ECU generates a corresponding warning via the interior
buzzer.
Immobilizer
Lamp
Cases like releasing
the MSL Knob in OFF position will switch off the 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, if the
voltage of the fob battery is no longer sufficient, a certain battery
voltage measurement and low voltage detection strategy is implemented in
the fob. The measurement of the battery voltage will be done, if a button
is pressed or if a LF measurement command is received. To ensure a valid
result, it is not sufficient to do only a measurement, if a button is
pressed (e.g. if the driver only uses the passive mode and never presses a
button). Therefore the SMK ECU sends a measurement command to the fob.
This command is sent once during an IGN1 ON cycle, if the speed exceeds 40
km/h for the first time.If the PIF has detected a low battery voltage, the
LED will not be switched on at button
press. |