Hyundai Creta: BCM (Body Control Module) / Description and operation

Description
Communication Network Diagram

Abbreviation
Explanation
4WD_ECU
4WD Control Unit
A/CON
Aircon Control
ACU
Airbag Control Unit
B_CAN
Body Controller Area Network
BCM
Body Control Module
C_CAN
Chassis Controller Area Network
CLU
Cluster Module
ECU
Engine Control Unit
MDPS
Motor Driven Power Steering
SAS
Steering Angle Sensor
SJB
Smart Junction Block
SMK
Smart Key Unit
TMU
Telematics Unit
RR_CAM
Rear View Camera

Function
No
Item
Description
1
Washer Linked Wiper
If the washer switch is pressed ON for 0.06 second with the vehicle mode in IGN2, the wiper relay is turned ON after washer switch ON, and then the wiper relay is turned OFF after wiper parking signal ON.
2
MIST Linked Wiper
If the wiper mist switch is pressed ON for 0.6 second with the vehicle mode in IGN2, the wiper relay is turned ON, and then OFF after wiper parking signal ON.
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
Wiper linked with rear washer
If you turn on the rear washer switch while the IGN2 switch is turned on, the wiper power is turned on 0.3 seconds later. If the switch input lasts between 0.2 and 0.6 seconds, the wiper power is turned off 0.7 seconds later.
5
Rear wiper
If you turn on the rear wiper switch while the IGN2 switch is turned on, the rear wiper relay operates continuously.
6
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.
7
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.
8
Tailgate release
If the burglar alarm is not in the ARM state, the vehicle speed is less than 5 km/h, and all doors are unlocked, toggling the tailgate release switch from off to on turns on the tailgate unlock relay OUT.
If the vehicle speed is less than 5 km/h, opening the SMK tailgate (Passive trunk tailgate is switched from OFF to ON) turns on the tailgate unlock relay OUT.
9
Power Window Timer
Power window 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.
10
Seat Belt Reminder (Driver Side)
If Seat belt is not fastened, Indicator is turned ON at the first IGN ON, then turned OFF when the seat belt is fastened.
If the vehicle speed is over 20Km/h with Seat belt unfastened, Indicator blinks and chime buzzer is activated for 100 seconds.
While the vehicle speed is over 20Km/h with the seat belt fastened, then the seat belt is unfastened, Indicator blinks and chime buzzer is activated for 100 seconds. (Remider)
If the Seat belt is fastened or the vehicle mode is switched to IGN OFF while 100 sec. buzzer is activating, the Indicator blinking and the buzzer is turned OFF.
If the vehicle mode is switched to IGN ON with Seat belt unfastened, and vehicle speed exceeds 20Km/h with Indicator ON, Indicator blinks and chime buzzer is activated for 100 seconds.
11
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.
12
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.)
13
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.)
14
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.
15
Head Lamp Escort
If the vehicle mode is switched from IGN1 to IGN1 OFF, and the head lamp is turned ON by haed lamp switch or autolight, then the heed lamp is remained ON.
Head lamp is turned OFF in case of any of the following conditions.
① 15 seconds after driver side door is opened → closed.
② Head lamp or Autolight is not turned ON.
③ If driver side door is remained opened for over 5 minutes.
④ 5 minutes after the vehicle mode switching from IGN1 ON to IGN OFF.
⑤ If TX lock signal is received 2 times while H/Lamp is ON.
16
Head Lamp LOW / HIGH
If Head 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.
17
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.
18
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.
19
Rear Fog Lamp
Rear Fog Lamp is turned on if the Rear Fog Lamp Switch is pressed when the vehicle is in IGN1 ON Mode and the Front Fog Lamp Switch is turned ON.
The Rear Fog Lamp is turned OFF if the Rear Fog Lamp Switch is pressed while the lamp is ON.
The Rear Fog Lamp is turned OFF if the IGN1 or the Tail Lamp Relay is turned OFF while the lamp is ON
Rear Fog Lamp is turned OFF if both of the Head Lamp Low Relay and the Front Fog Lamp Switch are turned OFF while the lamp is ON.
20
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.
21
Tail Welcome
If the vehicle mode is switched to KEY OFF, all doors are closed and locked while the tail lamp is turned ON (Head lamp switch or AUTO switch + night time), then RKE unlock is activated, the tail lamp is turned ON for 15 seconds.
22
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.
23
Static Bending Lamp (SBL)
The left/right Static Bending Lamp (SBL) is turned ON corresponding to the steering wheel angle while the head lamp is ON.
If the shift lever is in R position, then the lamp opposite of the wheel angle is turned ON.
In case of domestic models, the lamp is not turned ON if the vehicle speed is below 3Km/h or when the shift lever is in R position.
24
Turn Signal LAMP(HAZARD)
Inputting the left turn signal lamp switch signal turns on the left turn lamp when the vehicle mode is in IGN2 ON.
Inputting the right turn signal lamp switch signal turns on the right turn lamp when the vehicle mode is in IGN2 ON.
Hazard lamp is turned ON when the hazard switch ON.
25
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.
26
Normal/ARMWAIT/Relock Mode
If TX lock signal is received with KEY IN switch removed from the cyllyndicatorer 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.
27
Alarm Condition
If Alarm activation condition is detected, then start inhibit is turned ON to prevent engine start and the alarm is activated.
28
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.
29
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.
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
(SAB option only)
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 KEY 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
AV Tail Lamp
If the Auto Light Sensor value is below Tail Lamp ON (0.4V) condition while in ACC ON Mode, the AV Tail Lamp Output is turned ON after 1 second.
If the Auto Light Sensor value is above Tail Lamp OFF (0.85V) condition while the AV Tail Lamp is ON, the AV Tail Lamp Output is turned OFF after 1 second.
38
ESS Extended Function
ESS Extended Function (Hazard Lamp Blink) Logic
If the ESS Extended Function is ON, the turn signal lamp and the turn signal output are controlled to Percent Current “ON" Time at 40~60%. ESS Extended Function is turned OFF if any other value is received.
If the Hazard Switch is turned ON while Extended Function is active, the Hazard Switch is turned ON for 500ms and then turned OFF. However, if the ESS Extended Function is turned OFF within the 500ms duration, the Hazard Switch is also turned OFF.
39
Horn Answer Back
If ARM WAIT Mode is entered via TX Lock, and then ARM WAIT Mode is maintained through TX Lock within 4 seconds, then the horn is activated for 100ms.
If TX Lock is entered while in ARM/ARM WAIT Mode, and then TX Lock is entered again within 4 seconds, then the horn is activated for 100 ms.

Schematic diagrams
Circuit Diagram ...

Repair procedures
Removal 1. Disconnect the negative (-) battery terminal. 2. Remove the main crash pad assembly. (Refer to Body - "Main Crash P ...

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