2012 SSANGYONG KORANDO ignition

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2. IMMOBILIZER/REMOTE CONTROL KEY CODING
1) System Overview
While the communication between BCM/SKM and ECU is based on the CAN communication, the
communication between transponder and BCM/SKM is based on LF (Low frequency) and RF (Radio
frequency). When the ignition switch is turned to ON position, the BCM checks the verified transponder
according to the immobilizer verification procedure, if correct, allows the vehicle to start the engine. The
immobilizer indicator comes on during the communication and if the verification is carried out
successfully the indicator goes off.
If there is something wrong in the system, the indicator blinks.
2) System Layout

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3) Operation of Immobilizer
When the ignition switch is turned to the ON position with REKES key, the BCM checks the crypto code
of the inserted key using the immobilizer antenna and sends whether the engine is startable or not to the
engine ECU through the CAN communication so that the engine can be started.
BCM
REKES key
Immobilizer antenna
ECUCAN line
For the vehicle with the immobilizer, there can be a problem in starting the vehicle or the system error:
When two or more immobilizer keys come into contact with (each) other(s).
When the key is close to any device sending or receiving electromagnetic fields or waves other
than Ssangyong products.
When the key is close to any electronic or electric devices such as lighting equipment, security keys
or security cards.
When the key is close to a magnetic or metal object or a battery. -
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1) Coding
(1) Coding process
Coding for each unit ▶
(2) Operation with/without smart key/EMS registration
Passive
LOCK/UNLOCKIgnition status
changeSTARTING THE
ENGINE
New - O 10 times
Smart key registration O O -
EMS REGISTRATION - - -
Smart key & EMS
registrationOOO
3. OPERATIONS

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(3) Coding after replacing components
When replacing smart key and SKM: Register smart key and EMS
When replacing EMS: Register EMS -
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(4) VIRGIN power control
If the SKM is not coded at all, the power control is performed as follows:
Virgin control by TM & EMS ▶
If there is no variant code value from the EMS and no value is stored in the inactive memory area
after the ignition status is changed to IGN ON, the START signal is not sent.Power control ▶
The coding is available only when the ignition status is IGN1 ON.
Engine start ▶
If the SKM is in Virgin condition, the engine cranking can be performed up to 10 times.
No variant code in memory: IGN ON -> Check variant code -> Operate START switch -> Check
ignition status -> Request START
Variant code stored in memory: Normal operation -
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(2) Passive LOCK
When the system searches for a smart key by the input from the outside door handle switch, the SKM
sends the passive LOCK signal to the BCM if all the doors are closed and a normal smart key is found
outside the vehicle.
Passive LOCK hardware control ▶
The SKM sends the door LOCK/UNLOCK signal to the BCM through the BCAN network when a
smart key is verified after the signal from the driver/passenger outside door handle switch is received
through the hardware.
The SKM sends the signal to the BCM and instrument cluster when the warning and indicator
display conditions are met. 1.
2.
Passive LOCK by outside door handle switch ▶
When the ignition status is OFF, ACC ON or IGN ON, the SKM performs the verification procedure if the
LOCK signal is received from the driver/passenger door handle switch.
When the outside door handle switch is operated, the SKM verifies if a smart key is outside the
vehicle using the corresponding exterior antenna.
The SKM sends the signal for [Passive LOCK command] to the BCM through the BCAN if a smart
key is identified as being outside the vehicle.
If no smart key is verified as being outside the vehicle, this process is stopped and restarted when the
next signal is received from the outside door handle switch.
When the driver's door is unlocked with the ignition status ACC ON, the SKM changes the ignition
status to OFF and sends the signal for [Passive LOCK command] to the BCM through the BCAN to
lock the door. The BCM ignores the signal if the ignition status is IGN ON.
The SKM recovers the deactivated smart key function inside the vehicle when it receives the theft
deterrent deactivation signal from the BCM through the BCAN communication. 1.
2.
3.
4.
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The system first identifies the last smart key used, and then identifies all the other registered smart
keys until a normal smart key is verified.
The system identifies the smart keys by using the outside door handle antenna on the door handle
switch which has sent the signal.
Smart key search input: The last door is opened and then closed. Outside door handle switch, Brake
switch, START switch (Tailgate open request) 1.
2.
3.Smart key search mode ▶Searching for other keys ▶
When the ignition status is IGN ON or ACC ON, the SKM starts to verify the smart key if any door is
opened and then closed. If one or more smart keys are verified as being in the vehicle, the smart key
verification procedure is stopped. If no verified smart key is identified as being in the vehicle, the SKM
sends the signal which identifies that there is no verified key inside the vehicle to the BCM and instrument
cluster through the BCAN (Smart key not identified warning).Interruption of door LOCK & Smart key function by outside door handle switch ▶
When the door LOCK signal is received from the driver/passenger door handle switch with the ignition
status OFF or ACC ON, the SKM identifies the verified smart key and sends the passive LOCK signal
to the BCM through the BCAN if the ignition is turned to OFF.
The SKM receives the theft deterrent mode information signal from the BCM through the BCAN.
If there is any verified smart key in the vehicle, the function of the verified smart key is interrupted. 1.
2.
3.

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(3) Passive UNLOCK
When the system searches for a smart key by the input from the outside door handle switch, the SKM
sends the passive UNLOCK signal to the BCM if all the doors are closed and a normal smart key is
found outside the vehicle.
Passive UNLOCK hardware control ▶
The SKM sends the door LOCK/UNLOCK signal to the BCM through the BCAN network when a
smart key is verified after the signal from the driver/passenger outside door handle switch is received
through the hardware. 1.
Passive UNLOCK by outside door handle switch ▶
When the ignition status is OFF, ACC ON or IGN ON, the SKM starts to verify the smart key if below
conditions are met.
When the driver or passenger door handle switch is operated, the SKM verifies if a smart key is outside
the vehicle using the corresponding antenna.
When the outside door handle switch is operated, the SKM verifies if a smart key is outside the
vehicle using the corresponding exterior antenna.
The SKM sends the signal for [Passive UNLOCK command] to the BCM through the BCAN if a
smart key is identified as being outside the vehicle.
If no smart key is identified as being outside the vehicle, this process is stopped and restarted when
the next signal is received from the outside door handle switch.
When the driver's door is locked with the ignition status ACC ON or IGN ON, the SKM sends the
signal for [Passive UNLOCK command] to the BCM through the BCAN to unlock the door without
changing the ignition status to OFF. 1.
2.
3.
4.
Smart key search mode ▶
The system first identifies the last smart key used, and then identifies all the other registered smart
keys until a normal smart key is verified.
The system identifies the smart keys by using the outside door handle antenna on the door handle
switch which has sent the signal.
Smart key search input: The last door is opened and then closed. Outside door handle switch, Brake
switch, START switch (Tailgate open request)
Exceptional mode
When operating the door handle switch, the system changes the smart key searching conditions in
vehicle inside and outside according to the theft deterrent mode.
- Searching sequence when disarmed by BCM: Inside > Outside
- which function is restricted when the BCM is in theft deterrent mode. 1.
2.
3.
4.

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(4) Passive tailgate open
When a normal smart key is found by the signal from the tailgate open switch, the system sends the
tailgate open control signal to the BCM.
Passive tailgate open hardware input/output control ▶
The SKM receives the tailgate open switch signal from the BCM through the BCAN communication.
The SKM sends the tailgate open output signal to the BCM through the BCAN communication. 1.
2.
Tailgate open switch control ▶
Tailgate closed -> open
When the ignition status is OFF, ACC ON or IGN ON, the SKM starts to verify the smart key in the
tailgate open actuation area after receiving the tailgate open signal for [tailgate open request] from the
BCM through the BCAN.
The SKM sends the signal for [Passive tailgate open] to the BCM through the BCAN to open the
tailgate and deactivate the theft deterrent mode if a smart key is identified as being outside the vehicle.
If no smart key is identified as being outside the vehicle, this process is stopped and restarted when
the next tailgate open request signal is received. 1.
2.
Smart key search mode ▶
The system first identifies the last smart key used, and then identifies all the other registered smart
keys until a normal smart key is verified.
If the tailgate antenna identifies a normal smart key, the system searches for a smart key in inside
area of the tailgate and inside the vehicle.
The tailgate is opened only when a valid smart key is found within the tailgate antenna range, and the
tailgate is not operated by a smart key in inside area of the tailgate.
Smart key search input: The last door is opened and then closed. Outside door handle switch, Brake
switch, START switch (Tailgate open request) 1.
2.
3.
4. Tailgate open -> closed
When the tailgate is closed with all the other doors are closed, the SKM sends the signal for [smart
key inside the vehicle] through the BCAN if there is a verified smart key inside the vehicle.
When the tailgate is opened and then closed in theft deterrent mode, the signals for [external buzzer]
and [smart key detect warning] are sent for 10 sec. through the BCAN if there is a verified smart key
inside the vehicle. -