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Home >> Hyundai >> 2015 >> Elantra Coupe SE, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Module (BCM) >> Body Control Module (BCM) >> Description and Operation >> Function >> Head Lamp Function In/Out List

Head Lamp Function In/Out List

Function Characteristics Name
Hardware Label Spec. Designation
Input Digital L_HeadLampLowSW Head Lamp Low Switch
L_AutoLightSW Auto Light Switch
L_HeadLampHighSW Head Lamp High Switch
L_IGN1 Ignition1 power
L_EC_DRL_OPT Dedicated DRL option Switch
CAN Communication C_ALT_L Engine is running
C_SMKRKECMD SMK RKE Command from Fob
C_DRVDRSW Driver Side Door Open/Close Status
C_PARKING BRAKE SW Parking Brake Switch Status
C_CANADA_DRLSts DRL Option Switch
C_D_DRL_Act Dedicated DRL ON/Off State
C_HLampLOW_Act Head Lamp Low On/Off State
C_HLampHIGH_Act Head Lamp High On/Off State
Internal b_HeadAutoState Head Lamp Low On/Off request by Auto Light Control Module
Internal b_KeyOff L_KeyIn == Off & L_ACC == Off & L_IGN1 == Off & L_IGN2 == Off
b_C_IGNSW Same value with C_IGNSW (refer ECU spec.)
b_IGN on: b_C_IGNSW == IGN ON
off: b_C_IGNSW == KEY OFF ||
b_C_IGNSW == KEY IN || b_C_IGNSW ==ACC ON ||
b_C_IGNSW ==ST
b_ACC on: b_C_IGNSW == ACC ON
off: b_C_IGNSW == KEY OFF ||
b_C_IGNSW == KEY IN || b_C_IGNSW ==IGN ON ||
b_C_IGNSW ==ST
b_START on: b_C_IGNSW == ST
off: b_C_IGNSW == KEY OFF ||
b_C_IGNSW == KEY IN || b_C_IGNSW ==ACC || b_C_IGNSW ==IGN ON
b_HeadLampHighSW This signal reserved for separated Head Lamp High input from Passing input
b_PassingSW On: L_HeadLampHighSW==On Off: L_HeadLampHighSW==Off
b_HeadLampLowSWOn On: L_HeadLampLowSW == On || (b_HeadAutoState == On & (b_IGN == On || b_START == On))
Off: L_HeadLampLowSW == Off & b_HeadAutoState == Off
b_LOCK P_RKECMD == Lock || C_SMKRKECMD == Lock ||
C_PassiveLock == Lock
b_2LOCK b_LOCK counter
b_Unlock b_RKEUnLock==On || C_SMKRKECMD == UnLock ||
C_PassiveUnlock== UnLock
b_DRLOpt DRL Option
Output Digital O_HeadLampLowCTRL Head Lamp Low Output Status (Active Low)
Internal b_Escort Escort activation/deactivation Status
b_HeadLampHighOutput On: C_HeadLampHighON = OnOff: C_HeadLampHighON = Off
b_HeadLampLow Internal Head Lamp Low activity
b_HeadLampHigh Internal Head Lamp High activity
b_DRLOut DRL Option activation/deactivation Status
CAN Communication C_CANADA_DRLON CANADA DRL ON Command
C_D_DRL_ON DEDICATED DRL ON Command
C_HeadLampLowON Head Lamp Low On/Off command
C_HeadLampHighON Head Lamp High On/Off command
C_EXTTailON EXTTail On/Off command
  1. 2. Head lamp low signal control
    1. Head Lamp Low control output is ON if HEAD LAMP LOW output is ON by 'Head Lamp Low switch ON ' or 'AUTO LIGHT function'.
    2. Head Lamp Low control output is OFF when HEAD LAMP LOW output is ON->OFF.
  2. 3. Head lamp high control

    Head Lamp High input and Head Lamp Passing input by M/F is Head Lamp High switch processing for single input same MULTIFUNCTION WIRING DESCRIPTION as Head Lamp High switch only input.

    1. Head Lamp High Input

      When Head Lamp High switch ON that in IGN2 ON and Head Lamp Low control output is ON by IMP, Head Lamp High is consider as input.

    2. Head Lamp Passing Input

      When Head Lamp High switch ON that in IGN2 ON and Head Lamp Low control output is OFF, Head Lamp Passing is consider as input.

  3. 4. Multi-function wiring description
    Fig 1: Multi-Function Wiring Description
    G10545667Courtesy of HYUNDAI MOTOR AMERICA