2012 SSANGYONG KORANDO start stop button

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2. OPERATING PROCESS
1) System Layout
(1) Engine start
SKM performs the authentication process for the SMART key and sends the engine start request to
EMS if there is a normally coded SMART key when pressing the Engine Start/Stop button with the
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960099004702c8007502c9004700970096009a0090009b0090>on.
SKM sends the start request signal to PCAN network and the cranking request to BCAN network by
“SMART key location” signal when receiving the engine start signal by Engine Start/Stop
button.
SKM turns off the IGN2/ACC relay during cranking to shut down the electric loads.
SKM receives the starting status signal from EMS throug PCAN.
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8b0047009a008c0095008b009a0047009b008f008c00470097>ower status signal of “IGN
after started” through BCAN.
EMS starts to crank the engine after checking the pre-heating condition if it receives the engine
cranking request 1 when pressing the Engine Start/Stop button. EMS starts to crank the engine
immediately if it receives the engine cranking request 2 when pressing the Engine Start/Stop button. 1.
2.
3.
4.
5.
6.
Engine cranking request 1: when pressing the Engine Start/Stop button shortly in normal
conditions
Engine cranking request 2: when pressing the Engine Start/Stop button again after first press or
when pressing the Engine Start/Stp button for more than 3 seconds -
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Engine start during driving 7.
When pressing the Engine Start/Stop button with IGN ON, the engine start is requested if the
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8f008c0047008e008c008800990047009a008f0090008d009b> lever is in ‘N” position and
the brake switch is ON (no need authentication for 30 seconds).
When pressing the Engine Start/Stop button with IGN ON, the engine start is requested
regardless of brake signal if the vehicle s
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47>‘
position (no need authentication for 30 seconds).
Except input of brake switch signal
In vehicle equipped with A/T, when pressing the Engine Start/Stop button for more than 10
seconds with ACC ON, the engine start is requested regardless of brake signal if the gear shift
lever is in “P” or ‘N” position in IGN ON. -
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Key approval process in Smart key system equipped vehicle
The key approval consists of two processes; immobilizer key approval and Smart key
approval. ▶
Immobilizer key approval: When inserting the Smart key into Smart key slot, the power is supplied to the
key slot. SKM communicate with the Smart key in key slot to check if it has valid crypto code. If it is valid,
ECU start to control the engine when pressing the Engine Start/Stop button. The system has 10
seconds of valid time-out period. If the engine does not start in this period, the key approval process
should be done again.
Smart key approval: When pressing the Engine Start/Stop button or depressing the brake pedal without
Smart key inserted into the key slot, SKM communicate with the Smart key to check if it has valid crypto
code. If it is valid, the engine can be started.

04-20
5) Start & Power Mode Control
The smart key system performs the smart key verification inside the vehicle to operate the
'Passive/Emergency start' and 'Power mode control'. It performs the following functions according to the
verification result.
Power mode control: Ignition status change
Immobilizer communication with EMS
Start request transmission to EMS -
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(1) Hardware interface
Replace the input shaft speed sensor with EMM or A/T and perform the TCU initialization and
coding work. ▶
Start button
- The SKM receives the signals from the START button and changes the ignition status or
stars/stops the engine.
Immobilizer holder antenna
- The SKM communicates with immobilizer antenna to verify the smart keys. 1.
2.
Output ▶
ACC relay
- The SKM operates the ACC relay.
IGN1 relay
- The SKM operates the IGN1 relay.
IGN2 relay
- The SKM operates the IGN2 relay.
START ready display
- The SKM operates the START ready display.
ACC status display
- The SKM operates the ACC status display.
ON status display
- The SKM operates the ON status display.
LF antenna
- The SKM controls the LF antenna outputs. 1.
2.
3.
4.
5.
6.
7.

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(2) Ignition status change
The ignition status is changed to OFF, ACC ON, IGN ON and engine cranking by one START/STOP
button.
The SKM cuts the power for IGN2 and ACC relays while the engine is cranking as cutting the electric
load is necessary.
The SKM monitors the brake pedal status through the hardware signals.
The ignition status change is available when the engine START/STOP button is pressed.
The SKM uses the EMS (engine condition) and ABS/ESP (FR vehicle speed) signals sent through the
P-CAN bus (High Speed CAN).
When the smart key battery is discharged and the driver inserts the smart key into the immobilizer slot
in emergency mode, the smart key verification is performed if the brake or START switch is pressed
before the ignition status is changed (ACC ON, IGN ON).
Ignition status change during driving 1.
2.
3.
4.
5.
6.
7.
When the engine START/STOP switch is pressed for 3 sec. or more at more than 3 km/h, the
ignition status is changed from IGN to ACC.
If the engine START/STOP switch is pressed again, the ignition status is changed from ACC to
IGN.
The 4 vehicle speeds are abnormal (CAN signal timeout, abnormal signal):
If the engine START/STOP switch is pressed for 3 sec., the ignition status is changed from IGN
to ACC. If the switch is pressed again, the ignition status is changed from ACC to OFF (DTC
set). -
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The SKM changes the ignition status as follows: 8.

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(4) Engine stop
When the START button is pressed at the vehicle speed of 3 km/h or less, the SKM turns off the IGN
relay to stop the engine.
When the vehicle speed is 3 km/h or more or no speed signal is input, the SKM performs the
following functions: 1.
2.
When the START switch is pressed for 3 sec. or more at more than 3 km/h, the ignition status is
changed from IGN to ACC.
If the switch is pressed again, the ignition status is changed from ACC to IGN.
When the START switch is pressed for 3 sec. or more with no vehicle speed signal (CAN signal
timeout, abnormal signal), the ignition status is changed from IGN to ACC. If the switch is pressed
again, the ignition status is changed from ACC to OFF. -
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When the START button is pressed and held with IGN ON, the ignition status is changed to OFF.
When the START button is pressed briefly, the ignition status is changed to ACC ON. 3.
(5) ACC ON/Power OFF
The SKM changes the ignition status to OFF from ACC ON when:
the engine START/STOP button is pressed with the brake pedal released after the ignition status is
changed from IGN ON to ACC ON.
the REKES LOCK or passive LOCK is operated with ACC ON.
the BCM sends the driver's door open signal.
12 minutes have passed with ACC ON. 1.
2.
3.
4.Except brake switch signal input
For the vehicles with A/T, when the START switch is pressed for 10 sec. or more, the ignition
status is changed to IGN ON and the engine start request signal is sent regardless of the brake
signal, provided that the initial ignition status is ACC ON and the gear selector lever is in P or N
position. *-