Exterior Lamp Control

Tail lamp function

Fig 1: BCM Communication Diagram - Tail Lamp Function
Courtesy of HYUNDAI MOTOR CO.
1. General Function Condition
  1. In BATTERY ON and Tail Lamp is off state, if user turns on the Tail lamp switch (Tail SW=ON), Tail Lamps are turned on.
2. Tail Auto Cut Function Condition
  1. The "Tail Auto Cut" strategy ensures that Tail lamps are turned off even if a driver forgets to turn them off.
  2. When the Tail lamp is turned on by Tail lamp switch, after key insertion, and if a user removes key and opens the driver side door, the Tail lamps are automatically turned off.
  3. While "Tail Auto Cut" function is active, if a user turns off the Tail lamp switch or inserts key, "Tail Auto Cut" function will be deactivated and Tail lamps can be turned on.
  4. "Tail Auto Cut" state is memorized in ECU, so even if battery reset, this state is not erased.
  5. During the activation of Escort function, no Tail Auto Cut mode is possible and it is only after escort function.
3. CAN signal Tail Activity Condition
  1. When tail lamp output condition is met, Tail Lamp activity CAN data is also turned on.
  2. When tail lamp output condition is not met, Tail Lamp activity CAN data is also turned off.
4. Internal signal Tail Activity Condition
  1. When tail lamp output is on, internal signal Tail Lamp activity is also turned on.
  2. When tail lamp output is off, internal signal Tail Lamp activity is also turned off.
    
    Fig 2: Tail Lamp Switch Blinking Pattern
    Courtesy of HYUNDAI MOTOR CO.
Head lamp function

Fig 3: BCM Communication Diagram - Head Lamp Function
Courtesy of HYUNDAI MOTOR CO.
1. Head Lamp Low Control
  1. In IGN terminal State (IGN=ON), if turn on the Head lamp low switch=ON, Head lamp low outputs are turned on.
  2. When Tail lamp Off and headlamp Off conditions are satisfied at the same time, Head lamp low and Tail lamp turned off simultaneous immediately.
2. Head Lamp High Control
  1. In IGN terminal state (IGN=ON) and Head lamp low switch On, if turn on the Head lamp high switch=ON, Head lamp high outputs are turned on.
3. Passing Control
  1. In IGN terminal State (IGN=ON), If Head lamp passing switch Input is detected then Head lamp high output are turned on and Head lamp low output=On at the same time.
4. Canada DRL
  1. If alternator level is high (ALT L=On), BCM activates Canada DRL functionality and turns on the Head lamp high (CANADA DRL=On).
  2. Deactivation if:
    - Head lamp low On request by Head lamp switch or auto light head lamp Low control or
    - Head high On request by passing switch or
    - Parking brake switch On
      
      Fig 4: Parking Brake Switch Blinking Pattern
      Courtesy of HYUNDAI MOTOR CO.
Escort function
1. After user generates the call of head lamp low light (HeadLampLowSWOn=ON), if switch off ignition (IGN=Off and START=Off), and then keep Head lamp low output On (HeadLampLowON=ON) state during 20min.
2. And after open and close driver side door (DRVDRSW=ON→Off), user will have consequently lighting of head lamp low (HeadLampLowON=ON) during only 30sec.
3. During active "Escort Function", if receive Lock request 2 times (2LOCK=2) or cancel the lighting request of head lamp low (HeadLampLowSW=Off & AutoLightSW=Off), this function is released.
4. While escort function is activated, Tail lamp is keeping the turn on state and does not go to Autocut and after finish escort state and user removes key, it can go Autocut mode.
5. While the "Escort Function" is activated by 'Head Lamp Low Switch', if change from 'Head Lamp Low Switch' to 'Lamp Auto Switch', "Escort Function" is deactivated, because Lamp Auto mode is 'Lamp Off' condition.
6. While the "Escort Function" is activated by 'Lamp Auto Switch', if change from 'Lamp Auto Switch' to 'Head Lamp Low Switch', "Escort Function" is keeping the activation state, because of 'Head Lamp On' condition.
7. After IGN terminal off 20 minute timers is started, but as soon as door is opened and closed then 30sec timer is engaged.
  
  Fig 5: Head Lamp Low Switch Blinking Pattern
  Courtesy of HYUNDAI MOTOR CO.
Auto light control

Fig 6: BCM Communication Diagram - Auto Light Control
Courtesy of HYUNDAI MOTOR CO.
AV Tail output control
1. In ACC, IGN, START terminal states, monitoring of the auto light sensor supply's range (AutoLightPwr) is performed and a failure is raises up (Auto Light failure) when the supply's voltage is out of range (outside of range [4V:6V]).
  If Auto Light failure occurs and as long as this error is present, the tail lamp and head lamp low must be turned on regardless of the sunlight level provided by the sensor.
  
  When physical Auto light sensor failure occurs the Lamps are turned on, because a zero voltage level is provided by the sensor when internal failure is present.
  
  This is designed to prevent any head lamp cut off when the failure occurs during the night.
  
  AV Tail Output Control is started In ACC, IGN, START regardless of MFSW Auto Light switch.
  
  CAN signal AV_Tail is set/reset at the same time as AVTail.
Front fog lamp control

Fig 7: BCM Communication Diagram - Front Fog Lamp Control
Courtesy of HYUNDAI MOTOR CO.
1. In case of (IGN2=ON) & (HeadLampLow=ON) & (HeadLampHigh=Off), if Front fog lamp switch input is detected (FrontFogSW=On), Front fog lamp output (FrontFogON=On) is turned ON.
2. If fails to activate front fog lamp output, indicator (FrontFogIND) is also turn off.
  
  Fig 8: Front Fog Lamp Blinking Pattern
  Courtesy of HYUNDAI MOTOR CO.