Hyundai Sonata: Description and Operation - BCM (Body Control Module) - Body Electrical SystemHyundai Sonata: Description and Operation

Description
Body Control Module (BCM) Function
No
Item
Description
1
Washer Linked Wiper
-
If the washer switch is pressed ON for 0.06~0.2 second with the vehicle mode in IGN2, the wiper relay is turned ON 0.3±0.1 second after washer switch ON, and then the wiper relay is turned OFF 0.7±0.1 second later.
-
If the washer switch is pressed ON for over 0.2 second with the vehicle mode in IGN2, the wiper relay is turned ON 0.3±0.1 second after washer switch ON, and then the wiper relay is turned OFF 2.5~3.8 seconds (wiper activates 2~3 times) after washer switch OFF.
2
MIST Linked Wiper
-
If the wiper mist switch is pressed ON for 0.7 second with the vehicle mode in IGN2, the wiper relay is turned ON, and then OFF 0.7 second later.
-
If the wiper mist switch is pressed ON for over 0.7 second with the vehicle mode in IGN2, the wiper relay is turned ON, and then turned OFF 0.7 second after wiper mist switch OFF.
3
Variable INT Wiper
-
If the INT wiper switch is turned ON with the vehicle mode in IGN2, INT wiper operates intermittently (10 ~2.2 sec.) based on the INT volume setting.
4
Rear Defogger Deicer Timer
-
If the defogger switch is turned ON with the vehicle mode in alternator ON, defogger relay is turned ON for 20 minutes.
-
If the defogger switch is pressed one more time or if alternator mode is turned OFF while the defogger is ON, then the defogger relay is turned OFF.
5
ATM Shift Lock
-
If brake switch is turned ON with the vehicle mode in IGN1 ON and the shift lever in P position, ATM solenoid is turned ON to unlock the shift lever.
6
Trunk Release
-
Trunk release relay is turned ON for 0.2±0.02 second if TX trunk signal is received.
-
If trunk release switch is turned ON with all doors unlocked, trunk releaserelay is turned ON for 0.2±0.02 second.
(However, Trunk release switch is ignored when in ARMWAIT, ARM, REARM, or ALARM mode.)
-
If Interior trunk release switch is turned ON, trunk release relay is turned ON for 0.2±0.02 second.
(However, Trunk release relay is NOT turned ON of the vehicle speed is over 5km/h(3.1mi/h), or if the vehicle is in ARMWAIT, ARM, REARM, or ALARM mode.)
7
Power Window Timer
-
Power wIndicatorow relay is turned ON when the vehicle mode is switched to IGN ON.
-
When the vehicle mode is switched IGN ON > OFF, power window relay is turned ON for 30 seconds.
-
If a door is opened during the 30 second power window relay ON period, the power window relay is immediately turned OFF.
-
If a door is opened and the vehicle mode is switched IGN ON > OFF, power window relay is immediately turned OFF.
8
KEY Operated Warning
-
If the driver door is opened with the KEY IN, buzzer is continuously activated at 1 second interval.
-
The buzzer is turned OFF if KEY OUT or the door is closed while the chime buzzer is activated.
9
Parking Brake Warning
-
If the vehicle speed exceeds 5Km/h(3.1mi/h) while the vehicle mode is in IGN1 and the parking brake is engaged, buzzer is sounded until the parking brake is released.
(Buzzer activates at 0.6 second ON and 0.4 second OFF at 1 second interval until the parking brake is released.)
10
Decayed Room Lamp
-
If a door is opened with the vehicle mode in IGN OFF, the room lamp is turned ON. If the door is closed, the room lamp is remained ON for 30 seconds then turned OFF. (dimmer 2±0.2 sec.)
-
If the door is remained opened, the room lamp is remained ON for 20 minutes, then turned OFF. (dimmer 2±0.2 sec.)
11
KEY Hole Illumination
-
Key illumination Lamp is turned ON if a door is opened while the vehicle mode in IGN1 switch OFF, and the Key illumination Lamp is turned OFF 30 seconds after the door is closed.
-
If the vehicle mode is switched to IGN1 ON while Key illumination lamp is ON, then the lamp is immediately turned OFF.
-
If the vehicle mode is switched to ARMWAIT while Key illumination lamp is ON, then the lamp is immediately turned OFF.
12
Tail Lamp Auto Cut
-
If Tail switch is switched OFF> ON, the tail relay is turned ON.
-
If Tail switch is turned OFF, then the tail relay is turned OFF.
-
If KEY IN switch OFF & Tail switch ON & Driver Door OPEN while in KEY IN switch ON & Tail switch ON, the tail relay is turned OFF. (Auto OFF)
-
If KEY IN switch is turned ON after Auto OFF, then the tail relay is turned ON. Tail relay does not turn back ON even if the driver side door is opened > closed.
13
Head Lamp Escort
-
If the vehicle mode is switched from IGN1 to IGN1 OFF, and the haed lamp is turned ON by haed lamp switch or autolight, then the haed lamp is remained ON.
-
Haed lamp is turned OFF in case of any of the following conditions.
15 seconds after driver side door is opened > closed.
Haed lamp or Autolight is not turned ON.
If driver side door is remained opened for over 5 minutes.
20 minutes after the vehicle mode switching from IGN1 ON to IGN OFF.
If TX Lock signal is received 2 times while head lamp is ON.
14
Head Lamp LOW / HIGH
-
If Haed lamp low is turned ON with head lamp low switch ON or autolight function, and head lamp high switch is ON (Self return), then the head lamp high is turned ON.
-
Head lamp high can only be turned OFF with the passing switch.
15
Head Lamp PASSING
-
Head lamp high activates only when the passing switch is turned ON and the vehicle mode is in IGN2 ON.
-
The switch is used to turn OFF when the Head lamp high is ON.
16
Front Fog Lamp
-
If the front fog is turned ON while tail lamp is ON, then the front fog lamp is turned ON.
-
If the front fog is turned OFF while the front fog lamp is ON, then the lamp is turned OFF.
-
If the head lamp low is turned ON while front fog is ON, then the front fog lamp is turned ON.
-
If the front fog is turned OFF while the front fog lamp is ON, then the lamp is turned OFF.
17
Auto Light Control
-
If Auto light sensor is detects light ON condition, then the light is turned ON 2.5 seconds later.
-
If the sensor detects light OFF condition, then the light is turned OFF 2.5 seconds later.
-
If the sensor detects tail light ON condition, then only the tail lamp is turned ON. If the sensor detects head lamp ON condition, then both the tail lamp and the head lamp are turned ON.
-
In case of head lamp ON condition, both the tail lamp and head lamp are turned ON regardless of tail switch ON/OFF status.
18
Daytime Running Light (DRL)
-
DRL Lamp is turned ON when the engine is started.
-
DRL Lamp is turned OFF if head lamp low or front fog lamp is turned ON.
19
Head Lamp Welcome
-
If the vehicle mode is switched to KEY OFF, all doors are closed and locked while the Head lamp is turned ON (Head lamp switch or AUTO switch + night time), then RKE unlock is activated, the Head lamp is turned ON for 15 seconds.
20
AV Tail Linked
-
When the vehicle mode is switched to ACC ON, the auto light sensor ambience is reflected.
-
If Auto light ambience level is tail lamp ON condition for over 2.5 seconds, then ON signal is sent.
-
If Auto light ambience level is tail lamp OFF condition for over 2.5 seconds, then OFF signal is sent.
21
RPAS
-
If the shift lever is switched to R position while the vehicle mode is in IGN1 ON, then buzzer is activated 0.5 second later.
-
-
Warning level is displayed in the cluster and buzzer is activated corresponding to the warning condition.
22
Horn Answer Back
-
If all doors are closed and the vehicle enters ARM mode with TX lock control, then TX lock signal is received within 4 seconds to maintain ARM mode, horn and hazard lamp are activated.
-
If the ARM mode is deactivated in 4 seconds, then horn and hazard lamp are not activated.
-
Horn and hazard lamp are activated if another registered TX lock signal is received within the 4 seconds.
23
Normal/ARMWAIT/Relock Mode
-
If TX lock signal is received with KEY IN switch removed from the cylIndicatorer and all doors are closed, then all doors lock signal is outputted, and when all door lock switch is locked, then hazard lamp is turned ON 1 time, and the vehicle enters ARM mode after expiration of ARMWAIT time (30 sec.).
-
If TX lock signal is received while any one of the doors, hood, or trunk is opened, then only the lock signal is outputted. Hazard lamp is not turned ON and the vehicle does not enter the ARM mode.
-
If any of the doors is not opened or KEY IN is not detected within 30 seconds after receiving TX unlock signal, then the vehicle returns to ARM mode.
24
Security Indcator Control
-
If the vehicle is in ARMWAIT mode while KEY OUT, then Indicator is remained ON. Indicator blinks in interval if the vehicle is in any mode other than ARMWAIT. (Blink Interval: 2 sec. OFF, 0.3 sec. ON)
25
Alarm Condition
-
If Alarm activation condition is detected, then start inhibit is turned ON to prevent engine start and the alarm is activated.
-
Alarm is activated 2 times (27 sec. ON, 10 sec. OFF).
26
DISARM / Alarm Deactivation Condition
-
If TX UNLOCK/LOCK switch signal is received, unlock/lock signal is outputted for 0.5 second, and START INHIBIT is turned OFF.
-
If KEY IN switch=ON & IGN1 switch=ON & IGN2 switch=ON & alternator=ON is maintained for 30 seconds, then START INHIBIT is turned OFF and the vehicle mode is switched to DISARM.
27
RESET
-
If the battery is disconnected while the alarm is activating, and then reconnected, then the alarm also reactivates.
-
If the battery is disconnected while the vehicle is in ARM mode, and then reconnected, the vehicle maintains ARM mode.
28
PANIC
-
If TX_Panic signal is received, panic alarm is turned ON and the horn and hazard are activated for 27±2 sec.
-
If a signal is received while panic alarm is activating, then the panic alarm is turned OFF.
-
If ARM condition is satisfied while panic alarm is activating, then the vehicle enters ARM mode.
29
MTS Function
-
If Unlock signal is received from MTS, then all doors are unlocked.
-
If Lock signal is received from MTS, then all doors are locked.
-
If Remote engine start signal is received, then remote engine start command is sent to SMK.
-
If Hazard & Horn signal is received, then hazard and horn are activated.
30
Central Door Lock/Unlock
-
If Driver/Passenger side door KEY lock/unlock switch is turned ON within 3 seconds, then all door lock/unlock signal is outputted for 0.5 second.
-
If TX lock/unlock signal is received, then all door lock/unlock signal is outputted for 0.5 second.
-
If Driver door lock switch (Power window) is Lock/Unlock, then all door lock/unlock signal is outputted for 0.5 second.
31
Auto Door Lock
-
If the vehicle mode is in IGN1 ON & alternator ON, and the vehicle speed is over15km/h(9.3mi/h), all doors are locked within 1.5 seconds.
(However, if all doors are already locked or in case all door fail condition, then all door lock function is not executed.)
-
If any one of the doors is unlocked after locking via above condition, then lock command is executed 3 times. (at 1 sec. interval). Unlocked door that is locked during the 3 attempts is ignored.
-
Auto door lock function is not engaged in case of crash unlock condition.
32
Auto Door Unlock
-
If KEY OFF after KEY IN, then all door unlock is executed.
(However, if all doors are already unlocked, then the unlock command is not executed.)
33
Driver Door Unlock Switch Synchronized Auto Door Unlock
-
If All doors are closed, and driver door unlock switch is switched from locked to unlocked, then all door unlock signal is outputted 1 time for 0.25 second.
34
IGN KEY Reminder
This function does not activate if the vehicle speed is over 3Km/h(1.86mi/h).
-
If IGN KEY ON, Driver door switch = OPEN & driver door unlock state becomes locked, all door unlock is executed for 1 second after 0.5 second delay.
-
IGN KEY ON, Assist door switch = OPEN & assist door unlock state becomes locked, all door unlock is executed for 1 second after 0.5 second delay.
-
If Driver door switch is closed within 0.5 second from driver door unlock state switchitching UNLOCK > LOCK when the vehicle is in IGN KEY ON mode, all door unlock is executed only 1 time for 1 second.
-
If unlock condition is satisfied, then unlock is executed even if the condition is not maintained for 0.5 second.
35
Passive KEY Reminder
-
This function does not activate if the vehicle speed is over 3Km/h(1.86mi/h).
-
If KEY Reminder signal is received from SMK, then all door unlock command is outputted for 1 second.
-
If the door remains locked even if unlock command is outputted for 1 second as stated above, then unlock is attempted for up to 3 times (excluding the 1st output) (1 sec. interval: 0.5 sec. ON/OFF)
36
Crash Door Unlock
-
Unlock is executed every time ACU signal is inputted when IGN switch is turned ON. Unlock output continues for the set duration even if the vehicle mode is switched from IGN KEY ON to OFF.
-
If the Driver/Assist/Rear door lock switch is switched from unlock to lock after executing unlock, then unlock command is executed again for 5 seconds.
-
Auto Door Lock function is not engaged in case of crash unlock condition.
37
HBA (High Beam Assist)
-
If Head lamp high switch is turned ON with AUTO switch night condition, HBA mode is activated.
-
If oncoming vehicle or vehicle in front is detected (signal input from LDWS) while in HBA mode, then head lamp high is turned OFF.
-
If oncoming vehicle or vehicle in front is not detected, then head lamp high is turned ON automatically.

Communication Network Diagram

Abbreviation
Expalnation
ACU
Airbag Control Unit
ADM
Assist Door Module
B_CAN
Body Controller Area Network
BCM
Body Control Module
BSD
Blind Spot Detection
C_CAN
Chassis Controller Area Network
CLU
Cluster Module
DATC
Dual Automatic Temp Control
DDM
Driver Door Module
ESC
Electronic Stability Program
EMS
Engine Management System
LDWS
Lane Departure Warning System
M_CAN
Multi media Controller Area Network
MDPS
Motor Driven Power Steering
P_CAN
Powertrain Controller Area Network
PSM
Power Seat Module
SAS
Steering Angle Sensor
SJB
Smart Junction Block
SMK
Smart Key Unit
SPAS
Smart Parking Assist System
TCU
Transmission Control Unit
TPMS
Tire Pressure Monitoring System
VDC
Vehicle Dynamic Control
TMU
Telematics System
ABS
Anti lock Brake System
SCC
Smart Cruise Control

    Schematic Diagrams
    Circuit Diagram ...

    Repair procedures
    Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the center facia panel. (Refer to Heating, Ventilation and Air Conditioning - "Controller") 3. Disconnect the body contr ...

    See also:

    Troubleshooting
    Failure Diagnosis 1. In principle, ESP and TCS controls are prohibited in case of ABS failure. 2. When ESP or TCS fails, only the failed system control is prohibited. 3. However, when the ...

    Troubleshooting
    Troubleshooting Symptom Suspected area Repairment Pressing power switch does not turn on system Radio receiver power source circuit ...

    Delivery Pipe Repair procedures
    Removal     In case of removing the high pressure fuel pump, high pressure fuel pipe, delivery pipe, and injector, there may be injury caused by leakage of the high pressure f ...