Kia Picanto JA Quiz
Body Electrical System

Body Control Module (BCM)

In this manual: Body Electrical System
General Information — 8Maintenance — 30Engine Mechanical System — 46Engine Electrical System — 14Emission Control System — 11Engine Control System/Fuel System — 46Clutch System — 12Manual Transmission — 10Drive Shaft and Axle — 8Suspension System — 15Steering — 9Restraints — 17Brake System — 22Body (Interior and Exterior) — 104Body Electrical System — 80Heating, Ventilation, and Air Conditioning — 17
24steps
~144min
4/5difficulty
Done 0 of 24

Specifications

Specifications

[BCM Type]

Items Specifications
Rated Voltage 12 V DC
Operating Voltage 9–16 V DC
Operating Temperature -31 - 167°F (-35 - 75°C)
Dark Current SMK: 3 mA / Without key: 3.5 mA

[Non-BCM Type (Seat Belt Reminder and Lighting Unit)]

Items Specifications
Rated Voltage 12 V DC
Operating Voltage 9–16 V DC
Operating Temperature -22 -167°F (-30 - 75 °C)
Dark Current 1.5 mA

Components and Component Location

Components

[BCM Type]

[Left-hand drive]
[Right-hand drive]
Connector Pin Information
No. Connector A Connector B Connector C Connector D Connector E
1 Battery (+) Rear RH Door Open Sensor - Wake up navigation -
2 - Driver Power Window Lock Switch - Automatic Cut-Off Ground Room Lamp -
3 - Driver Power Window Unlock Switch - - -
4 Automatic Light Sensor - Door Lock Relay Security Alarm Relay -
5 Automatic Light Power - Dedicated DRL Pass-Through Switch -
6 B-CAN (High) Trunk Opener Switch Front Fog Lamp Relay - Turn Signal Power 1
7 B-CAN (Low) - - Safety Power Window Activation Rear LH Turn Signal Lamp
8 Hazard Signal - - - Rear RH Turn Signal Lamp
9 - - Safety indicator Headlamp Low Beam Relay Front Left Turn Signal
10 - - - Tail Lamp Relay Front Right Turn Signal
11 Auxiliary Door Unlock Switch - - Tail Lamp -
12 IGN1 Rear LH Door Open Sensor Trunk Unlock Relay High Beam Headlamp Relay Fog Light Switch
13 - Auxiliary Door Open Switch Door Unlock Relay - Headlamp High Beam Switch
14 - Driver Door Open Sensor Power Window Relay Start Inhibit Relay Headlamp Low Beam Switch
15 - Rear Left Door Unlock Switch Rear Fog Lamp Relay - Automatic Light Switch
16 - Rear Right Door Unlock Switch Auto light ground LED Turn Signal Malfunction Turn Signal Power 2
17 ACC Trunk Opener Switch DRL Power - -
18 IGN2 Hazard Warning Switch - Right Turn Signal Switch -
19 Key in Switch - DRL Power (IGN1) Left Turn Signal Switch -
20 Back-up Lamp Switch Sunroof open switch - Rear Fog Lamp Switch Map lamp
21 Driver Door Unlock Switch LIN
(DRL)
22 Ground (Power) Ground

[Non-BCM Type (Seat Belt Reminder and Lighting Unit)]

Connector Pin Information
No. Connector A Connector B
1 Battery (+) B-CAN (High)
2 IGN2 B-CAN (Low)
3 Back-up Lamp Switch Center Rear Seat Belt Indicator
4 Front Fog Light Switch Rear Left Seat Belt Indicator
5 - (Hazard Switch) - (Relay)
6 - (Left Turn Signal Switch) Front Fog Lamp Relay
7 Automatic Light Switch Dedicated DRL
8 Rear Right SBR Switch Headlamp Low Beam Relay
9 - (Right Turn Signal Switch) - (Left DRL Lamp)
10 Rear Fog Lamp Switch - (DRL Lamp Power)
11 Auto light ground Tail Lamp
12 IGN1 Automatic Light Power
13 ACC Automatic Light Sensor
14 - Rear Right Seat Belt Indicator
15 - Rear Fog Lamp Relay
16 Key in Switch - (Relay)
17 Headlamp High Beam Switch High Beam Headlamp Relay
18 Rear Left SBR Switch Tail Lamp Relay
19 Rear Center SBR Switch - (Right DRL Lamp)
20 Pass-Through Switch - (DRL Lamp Power)
21 Headlamp Low Beam Switch
22 Ground (Power)

Circuit Diagrams

Wiring Diagram

[BCM Type]

[Non-BCM Type (Seat Belt Reminder and Lighting Unit)]

Description and Operation

Description

Body Control Module (BCM) Function
No Item Description
1 Washer-linked wiper
  • If the washer switch is pressed for 0.06-0.2 seconds with the vehicle in IGN2 mode, the wiper relay turns on 0.3±0.1 seconds after the washer is activated, and then, 0.7±0.1 seconds later, the wiper relay turns off.
  • If the washer switch is pressed for more than 0.2 seconds with the vehicle in IGN2 mode, the wiper relay turns on 0.3±0.1 seconds after the washer is activated, and then the wiper relay turns off 2.5-3.8 seconds after the washer switch is released (wipers operate 2-3 times).
2 MIST-linked wiper
  • If the wiper fog switch is pressed for 0.7 seconds with the vehicle in IGN2 mode, the wiper relay turns on, and then turns off 0.7 seconds later.
  • If the wiper fog switch is pressed for more than 0.7 seconds with the vehicle in IGN2 mode, the wiper relay turns on, and then turns off 0.7 seconds after the wiper fog switch is released.
3 Variable INT wiper
  • If the INT wiper switch is turned on with the vehicle in IGN2 mode, the INT wiper operates intermittently (10 to 2.2 sec.) depending on the INT volume setting.
4 Wiper linked with rear washer
  • If the rear washer is activated with the IGN2 switch turned on, the rear wipers turn on 0.3 seconds later. If the switch input lasts 0.2 to 0.6 seconds, power to the rear wiper is cut off 0.7 seconds later.
5 Rear Wiper
  • If the rear wiper switch is turned on with the IGN2 switch turned on, the rear wiper relay operates continuously.
6 Rear window heater timer
  • If the heater switch is turned on with the vehicle mode in IGN ON and the generator running, the heater relay turns on for 20 minutes.
  • If the heater switch is pressed again or if the generator mode is turned off while the heater is on, the heater relay turns OFF.
7 KEY Inter Lock
  • If the KEY INTER LOCK switch is turned off while the vehicle mode is IGN1 ON or ACC ON, the key solenoid output is energized and prevents key removal.
8 Shift Interlock
  • If the brake switch is turned on while the vehicle mode is IGN1 ON and the shift lever is in P, the shift interlock solenoid is energized to release the shift lever.
9 Rear Door Release
  • The trunk opener relay turns on for 0.2±0.02 seconds when the trunk TX signal is received.
  • If the trunk opener switch is turned on while all doors are unlocked, the trunk opener relay turns on for 0.2±0.02 seconds. (However, the trunk opener switch is ignored in ARMWAIT, ARM, REARM or ALARM modes.)
  • If the trunk opener switch in the cabin is turned on, the trunk opener relay turns on for 0.2±0.02 seconds. (However, the trunk opener relay does NOT turn on if vehicle speed exceeds 5 km/h, or if the vehicle is in ARMWAIT, ARM, REARM or ALARM mode.)
10 Power window timer
  • The power window indicator relay turns on when the vehicle mode switches to IGN ON.
  • When the vehicle mode is switched from IGN ON to OFF, the power window relay remains on for 30 seconds.
  • If a door is opened during the 30-second period of the power window relay being on, the power window relay turns off immediately.
  • If a door is opened and the vehicle mode is switched from IGN ON to OFF, the power window relay turns off immediately.
11 Driver seat belt reminder
  • If the seat belt is not fastened, the indicator comes on when the ignition is first turned on, and goes off when the seat belt is fastened.
  • If the vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 100 seconds.
  • When vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 100 seconds. (Reminder)
  • If the seat belt is fastened or the vehicle mode is switched to IGN OFF while the buzzer is sounding for 100 seconds, the indicator flashes and the buzzer turns off.
  • If the vehicle mode is switched to IGN ON with the seat belt unfastened and vehicle speed exceeds 20 km/h, the indicator lights up, flashes, and the buzzer sounds for 100 seconds.
12 Passenger seat belt reminder
  • If there is no occupant in the passenger seat, the system operates as if the seat belt is fastened.
  • If the seat belt is not fastened, the indicator comes on when the ignition is first turned on, and goes off when the seat belt is fastened.
  • If the vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 100 seconds.
  • When vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 100 seconds. (Reminder)
  • If the seat belt is fastened or the vehicle mode is switched to IGN OFF while the buzzer is sounding for 100 seconds, the indicator flashes and the buzzer turns off.
  • If the vehicle mode is switched to IGN ON with the seat belt unfastened and vehicle speed exceeds 20 km/h, the indicator lights up, flashes, and the buzzer sounds for 100 seconds.
13 Rear seat belt reminder
  • If the seat belt is not fastened, the indicator lights up for 35 seconds when the ignition is first turned on, then turns off when the seat belt is fastened.
  • If the vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 35 seconds.
  • When vehicle speed exceeds 20 km/h with the seat belt unfastened, the indicator flashes and the buzzer sounds for 35 seconds. (Reminder)
  • If the seat belt is fastened or the vehicle mode is switched to IGN OFF while the buzzer is sounding for 35 seconds, the indicator flashes and the buzzer turns off.
  • If the vehicle mode is switched to IGN ON with the seat belt unfastened and vehicle speed exceeds 20 km/h, the indicator lights up, flashes, and the buzzer sounds for 35 seconds.
14 KEY IN Warning
  • If the driver door is opened with the KEY IN, the buzzer sounds continuously at 1-second intervals.
  • The buzzer turns off if KEY OUT or the door is closed while the buzzer is sounding.
15 Parking brake warning
  • If vehicle speed exceeds 5 km/h while the vehicle mode is IGN1 and the parking brake is applied, the buzzer sounds until the parking brake is released. (The buzzer activates 0.6 seconds after ignition on and 0.4 seconds after ignition off, repeating at 1-second intervals until the parking brake is released.)
16 Room Lamp Fade-Out
  • If a door is opened with the vehicle mode in ignition OFF, the room lamp turns on. If the door is closed, the room lamp remains on for 30 seconds and then turns off. (Dimmer 2±0.2 sec.)
  • If the door remains open, the room lamp remains on for 20 minutes and then turns off. (Dimmer: 2 ± 0.2 sec.)
17 KEY HOLE Illumination
  • Key illumination lamp: If a door is opened while the vehicle mode is IGN1 OFF, the key illumination lamp turns on, and the key illumination lamp turns OFF 30 seconds after the door is closed.
  • If the vehicle mode is switched to IGN1 ON while the key hole illumination lamp is on, the lamp turns off immediately.
  • If the vehicle mode is switched to ARMWAIT while the key hole illumination lamp is on, the lamp turns off immediately.
18 Tail Lamp Auto Off
  • If the tail switch changes from OFF to ON, the tail relay turns on.
  • If the tail switch is OFF, the tail lamp relay is turned off.
  • If the KEY IN switch is OFF, the tail switch is ON, and the driver's door is OPEN while the KEY IN switch is ON and the tail switch is ON, the tail relay turns off. (Automatic shut-off)
  • If the KEY IN switch is turned on after automatic shut-off, the tail relay turns on. The tail relay does not turn on even if the driver's door is opened and closed.
19 Headlamp Follow-Me
  • If the vehicle mode is switched from IGN1 to IGN1 OFF while the lamp is turned on by the headlamp switch or automatic lighting, the headlamp remains on.
  • The Haed lamp turns off under any of the following conditions. ① 15 seconds after the driver's door is opened and closed. ② The Haed lamp or the auto light is not turned on. ③ If the driver's door remains open for more than 5 minutes. ④ 20 minutes after the vehicle mode is changed from IGN1 ON to IGN OFF. ⑤ If the TX lock signal is received 2 times while the H/Lamp is on.
20 Headlamp LOW/HIGH Beam
  • If the low beam headlamps are on with the headlamp low beam switch or the automatic lighting function turned on, and the headlamp high beam switch is turned on (momentary return), then the high beam lamp is turned on.
  • The high beam headlamps can only be turned off by the headlamp switch.
21 Low Beam Headlamp
  • The high beam headlamps are activated only when the headlamp switch is on and the vehicle mode is in IGN2 ON.
  • The switch is used to turn off the high beam headlamps when they are on.
22 Front Fog Lamp
  • If the front fog lamp is turned on while the tail lamp is on, the front fog lamp turns on.
  • If the front fog lamp switch is turned off while the front fog lamp is on, the lamp turns off.
  • If the low beam headlamps are turned on while the front fog lamps are on, the front fog lamps also turn on.
  • If the front fog lamp switch is turned off while the front fog lamp is on, the lamp turns off.
23 Rear Fog Lamp
  • The rear fog lamps turn on if the rear fog lamp switch is pressed when the vehicle is in IGN1 ON mode and the front fog lamp switch is on.
  • The rear fog lamp turns off if the rear fog lamp switch is pressed while the lamp is on.
  • The rear fog lamp turns off if the IGN1 or the rear lamp relay is turned off while the lamp is on.
  • The rear fog lamp turns off if both the low beam relay and the front fog lamp switch are turned off while the lamp is on.
24 Automatic Light Control
  • If the auto light sensor detects a light-on condition, the lights turn on after 2.5 seconds.
  • If the sensor detects a light-off condition, the lights turn off after 2.5 seconds.
  • If the sensor detects the rear lamp on condition, only the rear lamp is turned on. If the sensor detects the headlamp on condition, both the rear lamp and the headlamp are turned on.
  • When the headlamp is turned on, the tail lamp and headlamp turn on regardless of the on/off state of the tail switch.
25 Tail Lamp Welcome
  • If the vehicle mode is changed to KEY OFF, all doors are closed and locked while the rear lamp is on (headlamp switch or AUTO switch + night time), then RKE unlock is activated, and the rear lamp is turned on for 15 seconds.
26 Static Bending Lamp (SBL)
  • The left/right static bending lamp (SBL) turns on according to the steering wheel angle when the headlamp is on.
  • If the shift lever is in the R position, the lamp opposite the steering angle turns on.
  • For domestic models, the lamp does not turn on if the vehicle speed is below 3 km/h or when the shift lever is in the R position.
27 Daytime Running Lamps (DRL)
  • The DRL lamp turns on when the engine is started.
  • The DRL lamp turns off when the low beam headlamps or front fog lamps are turned on.
28 TURN SIGNAL LAMP (HAZARD)
  • Supplying a signal from the left turn signal switch turns on the left turn signal lamp when the vehicle mode is in the IGN2 ON position.
  • The hazard lamp turns on when the hazard switch is turned on.
29 DPAS
  • If the shift lever is moved to the R position while the vehicle mode is IGN1 ON, the buzzer sounds after 0.5 seconds.
  • The warning level is displayed in the cluster, and the buzzer sounds according to the warning condition.
30 Normal/ARMWAIT/Relock Mode
  • If the TX lock signal is received when the KEY IN switch is removed from the cylinder and all doors are closed, then the all-door lock signal is output, and when all door lock switches are locked, the hazard lamp flashes 1 time, and the vehicle enters ARMED mode after the PREPARATION time (30 sec.) has elapsed.
  • If the TX lock signal is received when any of the doors, the hood, or the trunk is open, only the lock signal is output. The hazard lamp does not turn on, and the vehicle does not enter armed mode.
  • If none of the doors is opened or KEY IN is not detected within 30 seconds after receiving the TX unlock signal, the vehicle returns to ARMED mode.
31 Alarm Condition
  • If an alarm trigger condition is detected, the start inhibit is activated to prevent engine start and the alarm is activated.
32 DISARM/Alarm Deactivation Condition
  • If the TX UNLOCK/LOCK switch signal is received, the unlock/lock signal is output for 0.5 seconds, and START INHIBIT is deactivated.
  • If KEY IN is on, IGN1 is on, IGN2 is on, and the generator is on within 30 seconds, then the start lock is released and the vehicle mode switches to DISARM.
33 RESET
  • If the battery is disconnected while the alarm is being armed and then reconnected, the alarm is also armed again.
  • If the battery is disconnected while the vehicle is in ARM mode and then reconnected, the vehicle remains in ARM mode.
34 Central Door Lock/Unlock
  • If the KEY lock/unlock switch of the driver's/passenger's door is turned on for 3 seconds, then all door lock/unlock signals are output for 0.5 second.
  • If the TX lock/unlock signal is received, the lock/unlock signal is output to all doors for 0.5 seconds.
  • If the driver door lock switch (power window) is in the lock/unlock position, the lock/unlock signal is output to all doors for 0.5 seconds.
35 Automatic Door Lock
(SAB option only)
  • If the vehicle mode is IGN1 ON and the generator is on, and the vehicle speed exceeds 15 km/h, all doors lock within 1.5 seconds. (However, if all doors are already locked, or in case of failure of all doors, the all-door lock function is not performed.)
  • If any door is unlocked after locking under the above condition, then the lock command is executed 3 times (at 1 sec. intervals). A door unlocked during the 3 attempts is ignored.
  • The auto door lock function does not activate in the event of unlocking due to a collision.
36 Automatic Door Unlock
  • If KEY OFF follows KEY IN, all doors are unlocked. (However, if all doors are already unlocked, the unlock command is not performed.)
37 IGNITION KEY REMINDER This function is not activated if the vehicle speed exceeds 3 km/h.
  • If IGN is ON, the driver's door switch is opened, and the driver's door lock state becomes locked, all-door unlocking is performed for 1 second after a 0.5 second delay.
  • If KEY IGN is ON, the auxiliary door switch is opened, and the auxiliary door lock state becomes locked, all-door unlocking is performed for 1 second after a 0.5 second delay.
  • If the driver's door switch closes within 0.5 second after the driver's door is unlocked, switching the lock state from UNLOCK to LOCK, when the vehicle is in IGN KEY ON mode, all-door unlocking is performed only once for 1 second.
  • If the unlock condition is met, unlocking is performed even if the condition is not maintained for 0.5 seconds.
38 Passive Key Reminder
  • This function is not activated if the vehicle speed exceeds 3 km/h.
  • If a KEY Reminder signal is received from the SMK, all door unlock commands are output for 1 second.
  • If the door remains locked even though the unlock command is output for 1 second as described above, then unlocking is attempted up to 3 times (except for the 1st exit) (1 sec interval: 0.5 sec on/off).
39 Emergency Door Unlock
  • Unlocking is performed each time an ACU signal is supplied while the IGN switch is in the on position. The unlock output continues for the set time even if the vehicle mode is changed from IGN KEY ON to OFF.
  • If the driver's/assistant's/rear door lock switch is changed from unlock to lock after unlocking is performed, the unlock command is executed again within 5 seconds.
  • The auto door lock function does not activate in the event of unlocking due to a collision.
40 FOLD / UNFOLD
  • Folding/unfolding is performed when the fold/unfold switch is activated.
  • If the automatic switch is activated, folding/unfolding is performed automatically under any of the following conditions.
  1. When RKE lock/unlock is performed.
  2. When passive lock/unlock is performed.
  3. When an approach/departure signal from the smart key is detected.
41 AV Rear Lamp
  • If the automatic lighting sensor value is below the rear lamp on condition (0.4 V) in ACC ON mode, the AV rear lamp output turns on after 1 second.
  • If the automatic lighting sensor value is above the rear lamp off condition (0.85 V) while the AV rear lamp is on, the AV rear lamp output turns off after 1 second.

Communication Network Diagram
Abbreviation Description
ABS Anti-Lock Braking System (ABS)
ACU Airbag Control Unit
AEB Autonomous Emergency Braking
B-CAN Body Controller Network
BCM Body Control Module
C-CAN Chassis Controller Area Network
CLU Cluster Module
DATC Dual Automatic Temperature Control
Emergency Call Engine Control System
ESC Electronic Control Suspension
EVP Electric Vacuum Pump (EVP)
I-BOX Telematics System
LPI Liquid Oil Injection
H_U Head Unit (Audio/AVN)
M-CAN Multimedia Controller Network
MDPS Motor Driven Power Steering
PGS Park Assist System
UUZR Seat Belt Reminder and Lighting Module
SMK Smart Key Unit
TCU Transmission Control Unit
TMU Telematics System
SCP Tire Pressure Monitoring System

Repair Procedures

Removal

[BCM Type]

  1. Disconnect the negative (-) battery terminal.
  2. Remove the emergency pad lower panel. (Refer to Body - "Emergency Pad Lower Panel")
  3. Disconnect the connectors (A) of the body control module and the mounting clip (B).
  4. Remove the Body Control Module (A) after loosening the mounting nuts.
  5. Remove the body control module (B) by disconnecting the connectors (A).

[Non-BCM Type (Seat Belt Reminder and Lighting Unit)]

  1. Disconnect the negative (-) battery terminal.
  2. Remove the emergency pad lower panel. (Refer to Body - "Emergency Pad Lower Panel")
  3. Disconnect the connectors of the seat belt reminder and lighting module.
  4. Remove the seat belt reminder and lighting module (A) after loosening the mounting nut and bolt.

Installation

[BCM Type]

  1. Connect the connectors of the Body Control Module.
  2. Install the Body Control Module (BCM).
  3. Install the emergency pad lower panel.
  4. Connect the negative (-) battery terminal.

[Non-BCM Type (Seat Belt Reminder and Lighting Unit)]

  1. Connect the seat belt reminder and lighting unit connectors.
  2. Install the unbuckled seat belt reminder and lighting unit.
  3. Install the emergency pad lower panel.
  4. Connect the negative (-) battery terminal.

BCM Diagnosis Using KDS/GDS

[BCM Type Only]

  1. Body electrical system malfunctions can be quickly diagnosed using the vehicle diagnostic system (KDS/GDS). The diagnostic system (KDS/GDS) provides the following information.
    1. Self-Diagnosis: Checks malfunction and Diagnostic Trouble Code (DTC)
    2. Current Data: Check the system input/output status.
    3. Actuation Test: Check the system operating status
    4. Additional Functions: Controls other functions, including system parameter setting and zero point adjustment.
  2. Select "Vehicle Model" and "Body Control Module (BCM)" for inspection to check the vehicle with the scan tool.
  3. Select the "Current Data" menu to check the current input/output status.
  4. To change a user setting, select "User Setting".

Test yourself

A quick Kia Picanto JA quiz: every answer comes with an explanation and a link to the manual page.