When the combination switch is at AUTO position and ignition switch is out of ON position, if the state of the 
headlight or position light is on, continuously light for 60 seconds. If in 60 seconds, lock signal is received and 
this function is off. 

Position Lamp 

Small light switch is off. Small light and license lamp are lighted. 

Small light switch is off. Ignition switch is at OFF position: 

1)  Left turning light switch is on so that left position light lights and license plate light will not light. 

2)  Right steering lamp switch is off so that right position lamp lights and license lamp will not light. 

Steering Lamp 

Turning light system will use flashing signal of turning light to react to various body control requests. 

Requests from interior module of steering lamp system include left steering lamp switch, right steering lamp 
switch and alarm lamp switch. 

Requests from other external modules mainly include central door lock, diagnostic operation, anti-theft alarm 
system, emergency braking and collision flash. 

Collision flash has the highest priority and alarm light has the second highest priority. 

Collision flash 

When ignition swith is at ON position, if BCM receives collision signal from the hardware, front, rear, left and 
right steering lamp will flash at 83 times per minute sumultaneously. Press warning switch once again and 
warning flash function will be canceled. 

Alarm light 

No matter what position the ignition switch is at, press the warning switch and left and right steering lamps will 
flash at the same time at a frequency of about 83 times per minute. Press the warning switch again and the 
warning flash function will be canceled. 

Turning hints 

When the ignition switch is at "ON" position, turn on the left steering lamp switch. The left steering lamp will 
flash at a frequency of about 83 times per minute. 

When the ignition switch is at "ON" position, turn on the right steering lamp switch. The right steering lamp will 
flash at a frequency of about 83 times per minute. 

Turning light self-diagnosis: During turning for fail mode double-flashing, if one of the turning lights (21W) is 
damaged, the other turning light at the same side will flash at about double normal frequency. 

In the case of alarm activation, if one of the steering lamps is damaged, the steering lamps at both sides will flash 
at the frequency of about 166 times per minute. 

Lane changing light function 

When steering lamp switch is turned on and it is turned off between 100 ms and 700 ms, corresponding steering 
lamp will flash for three times as lane changing light hint. 

Emergency brake alarm 

If the vehicle speed (BCM receives signal through CAN bus) rapidly decreases due to emergency braking, all 
turning lights will be activated and flashing; if the vehicle speed stops decreasing, the alarm flash will be 
deactivated. (The deceleration higher than 0.55g is regarded as emergency brake and deceleration threshold vaule 
can be configured in EEPROM) 

BCM has a function of short circuit protection. If any steering lamp has fault, BCM should record and store this 
fault. 

Interior light and power saving function 

1959

 
 

Interior light system is mainly made up of two parts. First is interior light control and second is power saving 
control. 

Interior light control is mainly activation and off of indoor light. 

Power saving control is mainly to turn on or off power saving control relay. 

Interior light 

When one of following circumstances occurs, indoor dome light will fade to light in about 0.7 second. 

z  Any door opens. 

z  Turn off the ignition switch. 

z  When ignition is turned off, unlock request is sent including remote and internal unlocking. 

When one of following circumstances occurs, indoor dome light will fade to light in about 1.7 seconds. 

z  Ignition switch is at ON position and all doors close. 

z  When ignition switch is at OFF position and all doors close, lock request is sent including remote and 

internal unlocking. 

z  Central door lock is at unlocked state and ignition switch is at OFF position. Delay 30 seconds after the last 

door is closed.   

z  Interior light is lighted for 30 seconds and there is no condition to activate it. 

z  Close all doors and lock central door lock. 

The situation when interior dome light goes out immediately is as follows: 

z  It occurs when power saving delays to start for 10 minutes. 

Power Saving Function 

When following actions occur, power saving function will be re-timing. 

z  State change of ignition switch 

z  State change of any door 

z  Send unlock command including remote and internal unlocking. 

z  When power saving delays to start for 10 minutes, power saving relay will cut off power output of BCM. 

Keyhole illumination light/footlight 

Any door opens. Key illumination light and footlight turn on. Turn off after the door is closed for 3 minutes. 

Ignition switch is on. Footlight and key lighting lamp turns out. 

Lock command, footlight and key illumination light go out. 

If any one of doors is opened, turn on the key illuminating lamp and the foot lamp; and if the door is still not 
closed after 10min, the key illuminating lamp and the foot 

After 10 minutes if the door is also open, key illumination light and footlight go out in 10 minutes if any door is 
open, the timer resets. 

Remove the key form ignition switch and all the doors close. Footlight and key lighting lamp goes out. 

Rear Wiper/Washer Control 

BCM controls following states of front wiper: 

z  Front wiper wipes continuously and quickly. 

z  Front wiper runs continuously and at low speed. 

1960

 
 

z  Front wiper gets inching operation. 

z  Front washing/wiping 

z  Front wiper wipes automatically 

When ignition switch is at OFF/ACC position or front wiper switch is not on, front wiper is at OFF state which is 
default state. 

State 

If ignition switch is at ON position and wiper switch is at OFF position, the wiper should stop at stop position. 

If the wiper cannot detect stop position after the wiper has continuously run for 8 seconds, the wiper stops running 
and the fault is recorded and stored. 

Front wiper runs continuously and quickly. 

Turn the front wiper/washer switch to the continuous and quick operation position, the front wiper relay will be 
activated continuously and the front wiper will work continuously and quickly. 

Front wiper runs continuously and at low speed. 

Turn the front wiper/washer switch to the continuous operation position, the front wiper relay will be activated 
continuously and the front wiper will work continuously and at low speed. 

Front wiper gets inching operation. 

Turn the front wiper/washer switch to the inching operation position, the front wiper relay will be activated 
continuously and the front wiper will work at low speed. 

Front washing/wiping 

Front washing/wiping: If front washer switch is pressed, front wiper relay is activated for 1 second. If the switch 
is continuously pressed and not released, BCM thinks that the switch is pressed only once. 

Heating function 

Heating function is mainly made up of two parts, which are heating functions of rear defroster and rearview 
mirror and seats. 

Rear defrosting and rearview mirror heating function 

The voltage signal is achieved from CAN bus. When the battery voltage is higher than 10.7 V, and the ignition 
lock switch is at "ON", it allows the heating functions rear defroster/rear view mirrors to work. When the battery 
voltage is less than 10.3 V, BCM does not allow the heating functions of rear defroster/rearview mirrors to work. 

The rear defroster/rear view mirror heating switch is a push button switch. After pressing the defroster/rearview 
mirror heating switch, the heaters of rear defroster/rearview mirrors work for 12 minutes; if the heating switch is 
pressed again during heating, the heating stops. Press the rear defroster/rearview mirror heating switch again, the 
heaters of rear defroster/rearview mirror working for 12 minutes (accumulative running for 12 minutes) stops. 

There should be a time parameter (about 36 minutes) to reset the first time. Before the 36 minutes, the heating 
time is not accumulative. 

In the low voltage status, the heating functions of rear defroster/rear view mirror do not work. But previous timer 
(12 minutes) will not be interrupted and will still be included in the next cycle. 

Rear defroster/rear view mirror heater working signal will be sent to EMS through CAN. 

Window Control 

Ignition switch is at ON position to operate on the window. 

When ignition switch is at OFF position, window control will be shielded if any of following conditions is 
satisfied: 

z  1 minute after ignition switch is turned to OFF position. 

1961

 
 

z  Any front door opens in 1 minute. 

Manual up 

Press manual up button and the window will rise manually until the button is released or the window rises to the 
top. 

Manual down 

Press manual down button and the window will drop manually until the button is released or the window drops to 
the bottom. 

Automatic down 

Press automatic down button and the window will drop to the bottom or press other buttons which control this 
window. 

CAN Network Management 

Wake-up conditions of BCM CAN networks are as follows: 

Local network wake-up conditions are as follows: 

z  Ignition key is at ON position. 

z  Hazard alarm switch is at ON position. 

z  Key inserted state is changing. 

z  The light is not turned off and the alarm is activated. 

z  Command frame of remote key is received. 

z  The state of any door is changing. 

Dormancy conditions of BCM CAN networks are as follows: 

z  Ignition key is at OFF position. 

z  There is no change of key inserted state. 

z  Steering lamp is not activated. 

z  Remote key command is not received. 

z  There is no light which is not turned off and alarm function is activated. 

z  There is no change of state of any door. 

z  There is no signal transmission on CAN bus. 

Other functions 

1.  CAN bus communication function 

2.  LIN bus communication function 

 

1962