10.3.2 Description and operation 

10.3.2.1 Description and operation 

Overview 

In order to reduce the failure rate of vehicles, more effective humanistic control is realized. Therefore, BCM is 
integrated in electric accessories. BCM includes a RF receiver, with a frequency of 433 MHz. 

External Anti-theft Function 

When the vehicle is on alarm arrangement state, once there are external illegal actions, body anti-theft alarm 
system will enter the alarm status. Alarm cycle is as follows. Left and right flashlights flash and anti-theft alarm 
horn sounds interactively. If the system is at mute mode, the horn doesn’t sound. 

Switch between system silence mode and normal mode can be realized by long pressing remote unlock and lock 
buttons for 2 seconds at anti-theft deactivation state. 

The state of anti-theft alarm system is kept in EEPROM to ensure to keep original anti-theft alarm system status 
after the system removes power and restarts. 

Anti-theft alarm system consists of following states: 

Anti-theft deactivation state: There is no alarm and alarm arrangement in anti-theft system. Press remote unlock 
button to enter anti-theft deactivation state. 

Previous alarm state: There is no alarm in anti-theft system. After previous alarm period which is 3 seconds, the 
vehicle will enter alarm arrangement state. 

Alarm arrangement state: There is no alarm in anti-theft system. Any action to trigger alarm generates, the system 
will enter alarm state. Regardless of the state of anti-theft alarm system, if EMS sends engine locking signal on 
IGN ON condition, anti-theft alarm system will immediately enter alarm state. 

Alarm state: When alarm generates, enter alarm cycle. 

Reminding state: Close all doors in the reminding period which is 10 seconds and reminding state will stop. 
Anti-theft alarm system will enter alarm arrangement state or alarm deactivation state accordingly. If the 
reminding period which is 10 seconds ends, there are doors not locking and alarm system will enter alarm state. 

Anti-theft alarm 

When anti-theft system is at alarm mode and alarm cycle is as follows: 

Left and right flashlights flash and anti-theft alarm horn sounds interactively. Work cycle is as follows. It is on for 
500 milliseconds and off for 500 milliseconds. After 30 seconds , the horn stops and only left and right flashlights 
flash for 5 minutes . 

At alarm arrangement state, conditions to trigger alarm are as follows: 

z  Open the left front door 

z  Open the right front door 

z  Open the left rear door 

z  Open the right rear door 

z  Open rear compartment lid. 

z  Open engine compartment cover 

z  Illegal key ignition 

Otherwise, once BCM receives engine locking signal sent by EMS on IGN ON condition, the system will 
immediately enter anti-theft alarm state. 

1955

 
 

When remote lock button is received on alarm, turning light will flash once and alarm cycle will stop so that the 
system will enter anti-theft alarm arrangement system. In addition, trigger condition which is the same as before 
occurs again and alarm cannot be triggered. This trigger condition is reset only at alarm deactivation state. 

Deactivate alarm by remote unlock button or engine release signal sent by EMS and anti-theft system will enter 
alarm deactivation state. When remote unlock command is received, left and right turning lights will flash for 3 
times. Position light will be on for 25 seconds and LED stops flashing. 

State transition of anti-theft system 

When the ignition key is removed, close all doors/rear compartment lid/engine compartment cover and lock all 
doors with the remote lock button (press lock button once), turning lights flash once. First enter previous alarm 
state for 3 seconds after anti-theft deactivation state. At this time, anti-theft indicator flashes quickly and the cycle 
is as follows. It is on for 160 milliseconds and off for 160 milliseconds. In the meantime, if door or rear 
compartment lid or engine compartment cover is open, it will be always at previous alarm state. Otherwise, after 3 
seconds, the system will automatically transfer to anti-theft alarm arrangement state. At this time, anti-theft 
indicator flashes slowly. The cycle is as follows. It is on for 160 milliseconds and off for 1920 milliseconds. At 
anti-theft alarm arrangement state, anti-theft indicator keeps flashing at this cycle. 

When locking door with remote lock button, if door/rear compartment lid/engine compartment cover is not 
secured, steering lamp flashes for three times and the system will enter reminding state. Anti-theft horn sounds for 
2 sounds every 2 seconds. If pressing lock button in 10 seconds, the system will also stay at reminding state and 
after 10 seconds enter alarm cycle. If pressing remote unlock button in 10 seconds, the system will enter alarm 
deactivation state after reminding state. In the anti-theft alarm mode, if the remote unlock button is pressed again, 
it will stop the alarm cycle, and the anti-theft alarm arrangement status will be deactivated. If pressing lock button 
again, the system will enter reminding state again. 

Anti-theft alarm arrangement is automatically enabled. 

After automatic re-lock, the system will re-enter the anti- theft mode. 

Anti-theft horn disables/enables. 

In the anti-theft mode, pressing the remote "lock" and "unlock" buttons at the same time for more than 2 seconds, 
steering lamps will flash twice and the system will enter the mute mode. In the status of mute function, if it is 
alarming, the theft deterrent horn will not sound. 

And then simultaneously press the "lock" and "unlock" keys on the remote control unit for more than 2s; right 
now, the steering lamp flickers twice to indicate exit. 

Mute state 

Remote key learning 

Remote controller key learning function: In anti-theft deactivation case, open the driver door. Turn the key from 
OFF to ON 6 times in 10 seconds. the last stop is at the OFF position. At this time, the anti-theft indicator is on 
and steering lamp flashes once, and it indicates to enter the learn mode. Hold any button on the remote controller. 
If the anti-theft light flashes once, it indicates a successful learning. Four keys can be learned in turn. 

The remote controller learn mode will end after 10 seconds or after four keys learn, or the ignition lock is turned 
to "ON" after at least one key learning. 

Central door lock function 

Body control system provides following functions of central control door lock: 

z  Lock/unlock of remote key 

z  Unlock/lock of interior central door lock switch for super lock 

z  Automatic re-lock 

z  Automatic lock of driving vehicle 

z  Collision automatic unlock 

z  Automatic unlock at flameout 

1956

 
 

z  Rear compartment lid unlock 

z  Automatic lock of rear compartment lid 

z  Forbid unlocking of rear compartment lid. 

z  Forbid remote command 

z  Overheat protection of door lock motor 

Unlock/lock of remote key 

Ignition key is not at inserted state. Execute once in 1 second to press remote unlock button and four doors are 
unlocked. Steering lamp flashes 3 times to confirm. Interior lamp lights gradually while position lamp lights. 

When the ignition key is in the non-insertion state, press the lock key on the remote control unit once within 1s; 
then lock the five doors, flicker the steering lamp for confirmation, turn off the interior lamp gradually, and turn 
off the position lamp. 

Ignition key is not at inserted state. Press remote lock button twice or more in 500 milliseconds, then super lock 
starts. 

Ignition key is not at inserted state. Press remote lock button for more than 2 seconds then power window 
automatically closes. This signal transmits by LIN. 

Super lock 

Premise of super lock function is stopping at OFF position. 

Dual locking function: Dual locking function is realized by two methods: 

1)  Press remote lock button twice in 500 milliseconds. (Remote control double-click lock) 

2)  Turn the key to unlock position in 3 seconds, and then switch to lock position. 

Only for (1), flashlight will flash once to confirm. 

Unlock/lock of interior central door lock switch 

Press lock button and five doors lock. 

If central door lock switch is pressed to unlock position, BCM drives four doors to unlock when ignition switch is 
not at ON or ignition switch is at ON and vehicle speed is less than 15kph. 

When vehicle speed is higher than 15kph, central unlocked command will be disabled. 

Unlock of interior central door lock switch is only at anti-theft deactivation state. At other anti-theft states, there is 
no response. 

Automatic re-lock 

After pressing the remote unlock button 15 seconds, if none of all four doors, rear compartment lid is opened, all 
doors will automatically re-lock. Interior light turns off and the system will enter alarm arrangement state. 

Automatic lock of driving vehicle 

Five doors will automatically lock when the ignition switch is at ON position and vehicle speed is more than 20 
km/h. 

Collision unlock 

When SRS opening signal is received from CAN bus, four doors will automatically open. 

Note: But this function may not apply due to low battery voltage or collision damage to the door lock motor 
harness power supply. 

Collision signal occurs. Trigger central unlock twice in 3 seconds and left and right turning lights will keep 
flashing so that central lock will fail. Unless the door is open and ignition switch turns to OFF simultaneously, and 
collision signal has expired for 4 seconds. 

1957

 
 

Automatic central unlock at flameout 

With door locks locked, when the ignition key is removed, the four doors automatically unlock. 

Rear compartment lid unlock 

When inserting or removing the key, press remote rear compartment lid unlock button for 1 second and rear 
compartment lid can be unlocked by remote controller. 

Press rear compartment lid unlock switch for more than 1 second and rear compartment lid is unlocked. 

When ignition switch is at ON position and vehicle speed is higher than 15km/h, rear compartment lid unlock will 
not be executed. 

Automatic lock of rear compartment lid 

Rear compartment lid will automatically lock after closing for 1.5 seconds. 

During automatic re-lock process, rear compartment lid will also lock. 

Forbid remote command 

When ignition switch is at ON position, any remote command except alarm deactivation operation will not be 
executed. 

Overheat protection of door lock motor 

When it is executed continuously for six times and every interval time of lock or unlock action is not more than 
1280 millimeters, overheat protection function of door lock will be activated. At this time, only collision can 
automatically unlock and other unlock requests can only be executed once. Other lock/unlock requests except this 
will not be executed in 20 seconds. 

Driver alarm information 

When the driver has some abnormal operations, body control system will send CAN information to the instrument 
to make it generate sound warning to the driver. It includes following functions. 

Warning for light not off 

Ignition switch is at OFF position and the key is removed. Combination switch will light headlight or position 
light. If the driver’s side door is open, body control system will generate warning signal to the instrument to make 
it generate sound warning. 

Comfortable Lighting Control 

Follow me home lights 

In 10 minutes after ignition switch is from ON to OFF position, turn light switch from OFF position to small light 
position or headlight position or auto light position and then turn back to OFF position in 2 seconds. => Function 
of follow me home light is activated. => Low beam will light for 30 seconds. 

When follow-up home light function is activated, the low beam turns on by delaying for 180s if one door is 
opened (delay Reset) 

Function of remote control unlock vehicle-tracking lamp 

Ignition switch is at OFF position and press remote unlock button. Position light will light for 25 seconds. If in 25 
seconds there is close action, position light will automatically go out after 5 seconds when all doors close. 

Auto light 

When the ignition switch is at ON position, and the combination switch in at AUTO position, position light relay 
and the headlight relay automatically connect or disconnect in accordance with the LIN request. 

When the ignition switch is at ON position and combination switch is at AUTO position, fault signal in LIN 
message is effective. BCM will light the small light and low beam keeps previous state. 

1958