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

Kia Rio 2017-2024 YB Service Manual / Body Electrical System / Body Control Module (BCM)

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	2.5mA

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 (+)	Front wiper low back up switch	Static bending (Left)	-	DRL Dedicated
2	RPAS Power	Rear washer switch	-	Key inter lock switch	Tail lamp relay
3	IGN1	Rear wiper switch	B-CAN (High)	RPAS Buzzer	Power window relay
4	Key in switch	Front wiper switch	B-CAN (Low)	-	Front fog lamp relay
5	-	Front wiper INT volume switch	Auto light power	Door lock indicator	Rear fog lamp relay
6	Power window lock switch	Multifunction light switch	Interior lamp auto cut_Ground	Security indicator	Right DRL Dedicated
7	Sunroof open switch	PAS (LIN)	Room lamp	Key solenoid	Left DRL Dedicated
8	Rear right door unlock switch	-	Rear right turn signal	Headlamp low relay	DRL Dedicated_Power1
9	Front right door unlock switch	-	Rear left turn signal	Rear wiper relay	DRL Dedicated_Power2
10	Front left key unlock switch	-	Front left turn signal	Navi wake up	-
11	Wiper washer switch	Static bending (Power)	Trunk / Tailgate release switch	Wiper parking state	Dead unlock relay
12	PAS Power	Crash signal	Front right door open switch	-	Door unlock relay
13	-	-	Rear right door open switch	AV Tail	Door lock relay
14	ACC	Headlamp high switch	Front left door open switch	Start inhibit relay	-
15	IGN2	Fog lamp switch	Rear left door open switch	-	Trunk unlock relay Tailgate unlock relay
16	-	Turn signal switch	Auto light sensor	-	-
17	Hazard switch	Headlamp low back up switch	Auto light ground	-	Front wiper high relay
18	-	Rain sensor (LIN)	-	Headlamp high relay	Front wiper low relay
19	Rear left door unlock switch	Trunk / Tailgate open switch	Turn signal power	Alarm horn relay	Safety power window enable
20	Front left door unlock switch	COM (Diagnosis)	Front right turn signal	-	-
21	Frotn left key lock switch	Ground (Multifunction switch)
22	Ground_Power	Static bending (Right)

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

Connector Pin Information

No.	Connector A	Connector B	Connector C
1	Battery (+)	Turn signal power	B-CAN (High)
2	IGN2	Front left turn signal	B-CAN (Low)
3	Driver door unlock switch	Tail lamp switch	Rear center seat belt indicator
4	Rear left door unlock switch	Front fog lamp switch	Rear left seat belt indicator
5	Driver door open switch	Hazard switch	Tailgate (Trunk) unlock relay
6	Rear left door unlock switch	Left turn signal switch	Front fog lamp relay
7	Driver key lock switch	Auto light switch	DRL Dedicated
8	Power window lock switch	Rear right SBR switch	Headlamp low relay
9	Door lock relay	Right turn signal switch	-
10	Door lock indicator	Rear fog lamp switch	-
11	Front right turn signal	Auto light ground	AV Tail
12	IGN1	Rear left turn signal	Auto light power
13	ACC	Rear right turn signal	Auto light sensor
14	Assist door unlock switch	Key IN switch	Rear right seat belt indicator
15	Rear right door unlock switch	Tailgate (Trunk) release switch	Rear fog lamp relay
16	Assist door open switch	Tailgate (Trunk) open switch	-
17	Rear right door open switch	Headlamp high switch	Headlamp high relay
18	Driver key unlock switch	Rear left SBR switch	Tail lamp relay
19	-	Rear center SBR switch	-
20	Door unlock relay	Passing switch	-
21	-	Headlamp low switch
22	Ground	Ground

Schematic diagrams

Circuit Diagram

[BCM Type]

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

Description and operation

Description

Body Control Module (BCM) function

Item

Description

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.

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.

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.

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.

Rear wiper

–	If you turn on the rear wiper switch while the IGN2 switch is turned on, the rear wiper relay operates continuously.

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.

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.

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.

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.)

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.

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.

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.

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.

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.

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.)

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.)

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

Alarm Condition

–	If Alarm activation condition is detected, then start inhibit is turned ON to prevent engine start and the alarm is activated.

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.

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.

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.

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.

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.)

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.

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)

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.

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.

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
ACU	Airbag Control Unit
AVN	Head Unit (Audio / AVN)
B_CAN	Body Controller Area Network
BCM	Body Control Module
BSD	Blind Spot Detection
C_CAN	Chassis Controller Area Network
CLU	Cluster Module
ESC	Electronic Stability Program
EMS	Engine Management System
FPCM	Fuel Pump Control Module
LDWS	Lane Departure Warning System
M_CAN	Multimedia Controller Area Network
MDPS	Motor Driven Power Steering
MFS	Multi-Function Switch
P_CAN	Powertrain Controller Area Network
PGS	Parking Guide System
SAS	Steering Angle Sensor
SMK	Smart Key Unit
TCU	Transmission Control Unit
TPMS	Tire Pressure Monitoring System
VDC	Vehicle Dynamic Control
ABS	Anti-lock Brake 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.	Remove the driver's side shower duct (A) after loosening the screw.

4.	Disconnect the body control module connectors (A).

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

6.	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.	Remove the driver's side shower duct (A) after loosening the screw.

4.	Disconnect the seat belt remind & lighting unit connectors.

5.	Remove the seat belt remind & lighting unit (A) after loosening the mounting nuts.

Installation

[BCM Type]

1.	Connect the body control module connectors.

2.	Install the body control module (BCM).

3.	Install the driver's side shower duct.

4.	Install the crash pad lower panel.

5.	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 driver's side shower duct.

4.	Install the crash pad lower panel.

5.	Connect the negative (-) battery terminal.

BCM Diagnosis With KDS/GDS

[BCM Type Only]

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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