Kia Picanto: Body Electrical System / Body Control Module (BCM)

Kia Picanto JA 2017-2021 Service & Repair Manual / Body Electrical System / Body Control Module (BCM)

Specifications
Specifications
[BCM Type]
Items
Specifications
Rated voltage
DC 12 V
Operating voltage
DC 9 - 16 V
Operating temperature
-31 - 167°F (-35 - 75°C)
Dark current
SMK : 3mA / Keyless : 3.5mA

[Non-BCM Type (Seat Belt Remind & Lighting Unit)]
Items
Specifications
Rated voltage
DC 12 V
Operating voltage
DC 9 - 16 V
Operating temperature
-22 -167°F (-30 - 75°C)
Dark current
1.5mA

Components and components location
Components
[BCM Type]
[LHD]

[RHD]

Connector Pin Information
No.
Connector A
Connector B
Connector C
Connector D
Connector E
1
Battery (+)
Rear right door open switch
-
Navi wake up
-
2
-
Power window driver lock switch
-
Interior lamp auto cut ground
-
3
-
Power window driver unlock switch
-
-
-
4
Auto light sensor
-
Door lock relay
Burglar horn relay
-
5
Auto light power
-
Dedicated DRL
Passing switch
-
6
B-CAN (High)
Tailgate open switch
Front fog lamp relay
-
Turn signal power1
7
B-CAN (Low)
-
-
Safety power window enable
Rear left turn signal
8
Crash signal
-
-
-
Rear right turn signal
9
-
-
Security indicator
Headlamp low relay
front left turn signal
10
-
-
-
Tail lamp relay
Front rignt turn signal
11
Assist door unlock switch
-
-
AV Tail
-
12
IGN1
Rear left door open switch
Tailgate unlock relay
Headlamp high relay
Fog lamp switch
13
-
Assist door open switch
Door unlock relay
-
Headlamp high switch
14
-
Driver door open switch
Power window relay
Start inhibit relay
Headlamp low switch
15
-
Rear left door unlock switch
Rear fog lamp relay
-
Auto light switch
16
-
Rear right door unlock switch
Auto light ground
LED Turn signal fail
Turn signal power2
17
ACC
Tailgate release switch
RPAS Power
-
-
18
IGN2
Hazard switch
-
Right turn signal switch
-
19
Key in switch
-
RPAS Power (IGN1)
Left turn signal switch
-
20
Tail lamp switch
Sunroof open switch
-
Rear fog lamp switch
Room lamp
21
Driver door unlock switch
LIN
(RPAS)



22
Ground (Power)
Ground

[Non-BCM Type (Seat Belt Remind & Lighting Unit)]

Connector Pin Information
No.
Connector A
Connector B
1
Battery (+)
B-CAN (High)
2
IGN2
B-CAN (Low)
3
Tail lamp switch
Rear center seat belt indicator
4
Front fog lamp switch
Rear left seat belt indicator
5
- (Hazard switch)
- (Relay)
6
- (Left turn signal switch)
Front fog lamp relay
7
Auto light switch
Dedicated DRL
8
Rear right SBR switch
Headlamp low relay
9
- (Right turn signal switch)
- (Left DRL Lamp)
10
Rear fog lamp switch
- (DRL Lamp power)
11
Auto light ground
AV Tail
12
IGN1
Auto light power
13
ACC
Auto light sensor
14
-
Rear right seat belt indicator
15
-
Rear fog lamp relay
16
Key in switch
- (Relay)
17
Headlamp high switch
Headlamp high relay
18
Rear left SBR switch
Tail lamp relay
19
Rear center SBR switch
- (Right DRL Lamp)
20
Passing switch
- (DRL Lamp Power)
21
Headlamp low switch

22
Ground (Power)

Schematic diagrams
Circuit Diagram
[BCM Type]

[Non-BCM Type (Seat Belt Remind & Lighting Unit)]

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
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
KEY Inter Lock
If the KEY INTER LOCK switch is turned OFF with the vehicle mode in IGN1 ON or ACC ON, the key solenoidenoid output is turned ON and prevents the key from being removed.
8
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.
9
Tailgate Release
Tailgate release relay is turned ON for 0.2±0.02 second if TX tailgate signal is received.
If tailgate release switch is turned ON with all doors unlocked, tailgate releaserelay is turned ON for 0.2±0.02 second.
(However, Tailgate release switch is ignored when in ARMWAIT, ARM, REARM, or ALARM mode.)
If Interior tailgete release switch is turned ON, tailgate release relay is turned ON for 0.2±0.02 second.
(However, Tailgate 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.)
10
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.
11
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.
12
Seat Belt Reminder (Passenger Side)
If there is no one in the passenger seat, then the system operates as if seat belt is fastened.
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.
13
Seat Belt Reminder (Rear)
If Seat belt is not fastened, Indicator is turned ON for 35 seconds 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 35 seconds.
If 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 35 seconds. (Remider)
If the seat belt is fastened or the vehicle mode is switched to IGN OFF while 35 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 35 seconds.
14
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.
15
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.)
16
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.)
17
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.
18
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.
19
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.
① 15 seconds after driver side door is opened → closed.
② Haed lamp or Autolight is not turned ON.
③ If driver side door is remained opened for over 5 minutes.
④ 20 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.
20
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.
21
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.
22
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.
23
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.
24
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.
25
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.
26
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.
27
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.
28
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.
Hazard lamp is turned ON when the hazard switch ON.
29
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.
30
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.
31
Alarm Condition
If Alarm activation condition is detected, then start inhibit is turned ON to prevent engine start and the alarm is activated.
32
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.
33
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.
34
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.
35
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.
36
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.)
37
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.
38
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)
39
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.
40
FOLD / UNFOLD
Fold/Unfold is engaged when Fold/Unfold switch is activated.
If Auto switch is activated, then Fold/Unfold is engaged automatically in case of any of below conditions.
1)
If RKE Lock/Unlock.
2)
If Passive Lock/Unlock.
3)
If Smart Key approach/away signal is detected.
41
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.

Communication Network Diagram

Abbreviation
Explanation
ABS
Anti-lock Brake System
ACU
Airbag Control Unit
AEB
Autonomous Emergency Braking
B-CAN
Body Controller Area Network
BCM
Body Control Module
C-CAN
Chassis Controller Area Network
CLU
Cluster Module
DATC
Dual Automatic Temp Control
EMS
Engine Management System
ESC
Electronic Control Suspention
EVP
Eva Vacuum Pump
I-BOX
Telematics System
LPI
Liquid Petroleum Injection
H_U
Head Unit (Audio / AVN)
M-CAN
Multi media Controller Area Network
MDPS
Motor Driven Power Steering
PGS
Parking Guide System
SLM
Seat belt remind & Lighting Module
SMK
Smart Key Unit
TCU
Transmission Control Unit
TMU
Telematics System
TPMS
Tire Pressure Monitoring System

Repair procedures
Removal
[BCM Type]
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad Lower Panel")
3.
Disconnect the body control module connectors (A) and mounting clip (B).

4.
Remove the body control module (A) after loosening the mounting nuts.

5.
Remove the body control module (B) after disconnecting the connectors (A).

[Non-BCM Type (Seat Belt Remind & Lighting Unit)]
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad Lower Panel")
3.
Disconnect the seat belt remind & lighting unit connectors.
4.
Remove the seat belt remind & lighting unit (A) after loosening the mounting nut and bolt.

Installation
[BCM Type]
1.
Connect the body control module connectors.
2.
Install the body control module (BCM).
3.
Install the crash pad lower panel.
4.
Connect the negative (-) battery terminal.
[Non-BCM Type (Seat Belt Remind & Lighting Unit)]
1.
Connect the seat belt remind & lighting unit connectors.
2.
Install the seat belt remind & lighting unit.
3.
Install the crash pad lower panel.
4.
Connect the negative (-) battery terminal.
BCM Diagnosis With KDS/GDS
[BCM Type Only]
1.
In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (KDS/GDS).
The diagnostic system (KDS/GDS) provides the following information.
(1)
Self diagnosis : Checking failure and code number (DTC)
(2)
Current data : Checking the system input/output data state
(3)
Actuation test : Checking the system operation condition
(4)
Additional function : Controlling other features including system option setting and zero point adjustment
2.
Select the "Car model" and the 'Body Control Module (BCM)' to be checked in order to check the vehicle with the tester.
3.
Select the 'Current Data' menu to search the current state of the input/output data.

4.
If you want to change user option, select "user option".

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