Kia Forte: Body Electrical System / Integrated Body Control Unit (IBU)

Kia Forte 2019-2024 (BD) Service Manual / Body Electrical System / Integrated Body Control Unit (IBU)

Specifications

Items	Specifications
Rated voltage	DC 12 V
Operating voltage	DC 9 - 16 V
Operating temperature	-40 - 176°F (-40 - 80°C)
Dark current	Max. 4.0 mA

Components and components location

Component Location

[4DR]

1. Integrated Body Control Unit (IBU)

[5DR]

1. Integrated Body Control Unit (IBU)

Schematic diagrams

Connector and Terminal Function

[Non-Smart key]

Pin	Connector A	Connector B
1	-	Front washer switch_input
2	-	-
3	-	Key solenoid_output
4	-	Key in switch_output
5	-	Key interlock switch_output
6	Rear center seat belt indicator_output	wiper parking switch_input
7	Rear left seat belt indicator_output	Security indicator_output
8	Rear right seat belt indicator_output	Brake switch_input
9	Assist seat belt indicator_output	Haptic_output
10	Head lamp switch High_input	Front wiper volume switch_Input
11	Outside mirror unfolding_output	Keyhole illumination output
12	Outside mirror folding_output	-
13	-	Dedicated DRL
14	PDW alarm_output	PDW option_input
15	PDW-R power_output	B-CAN_Low
16	PDW-F power_output	B-CAN_High
17	PDW power_input	Power_ground
18	-	ECU_ground
19	-	-
20	-	-
21	-	-
22	KLINE_immobilizer	Start inhibitor relay_output
23	-	PDW switch indicator_output
24	-	Front wiper switch_input
25	Sunroof status_input	-
26	PDW switch_input	Multifunction switch ground_input
27	-	Wiper power relay_output
28	-	Auto light sensor ground_output
29	-	Auto light sensor signal_input
30	LIN1(PDW)	Auto light sensor power_output
31	-	-
32	Light switch_input	Front wiper high relay_output
33	Fog lamp switch_input	Front wiper low relay_output
34	IGN 2_input	Front wiper low back up switch_input
35	IGN 1_input	P-CAN_Low
36	ACC_input	P-CAN_High
37	Power_battery (+)
38	ECU_battery (+)
39	Immobilizer antenna power_output
40	Immobilizer antenna ground_output

[Smart key]

Pin	Connector A	Connector B	Connector C
1		Front washer switch_input	Driver outside handle switch_input
2	Puddle pocket lamp_output	-	Assist outside handle switch_input
3	-	-	FOB key searching signal_output (to WPC)
4	-	-	-
5	External buzzer_output	-	RPM_input
6	Rear center seat belt indicator_output	wiper parking switch_input	SSB illumination (+)_output
7	Rear left seat belt indicator_output	Security indicator_output	ACC relay_output
8	Rear right seat belt indicator_output	Brake switch_input	IGN 1 relay_output
9	Assist seat belt indicator_output	Haptic_output	IGN 2 relay_output
10	Head lamp switch High_input	Front wiper volume switch_Input	Start relay_output
11	Outside mirror unfolding_output	-	Driver outside handle switch_output
12	Outside mirror folding_output	-	Assist outside handle switch_output
13	-	Dedicated DRL	Interior antenna 1 (+)_output
14	PDW alarm_output	PDW option_input	Interior antenna 2 (+)_output
15	PDW-R power_output	B-CAN_Low	Interior antenna 3 (+)_output
16	PDW-F power_output	B-CAN_High	Rear bumper antenna (+)_output
17	PDW power_input	Power_ground	-
18	ESCL Enable_output	ECU_ground	-
19	ESCL unlock switch_input	-	-
20	ESCL (-)_output	-	-
21	-	-	SSB switch 1_input
22	KLINE_immobilizer	-	SSB switch 2_input
23	-	PDW switch indicator_output	AT : 'P' position_input
23	-	PDW switch indicator_output	MT : IGN lock switch_input (clutch)
24	-	Front wiper switch_input	ESCL_COM
25	Sunroof status_input	-	Wheel speed sensor_input
26	PDW switch_input	Multifunction switch ground_input	-
27	-	Wiper power relay_output	-
28	-	Auto light sensor ground_output	-
29	-	Auto light sensor signal_input	-
30	LIN1(PDW)	Auto light sensor power_output	Start feedback_input
31	ESCL (+)_output	-	Driver outside handle switch antenna_output
32	Light switch_input	Front wiper high relay_output	Assist outside handle switch_output
33	Fog lamp switch_input	Front wiper low relay_output	Interior antenna 1 (-)_output
34	IGN 2_input	Front wiper low back up switch_input	Interior antenna 2 (-)_output
35	IGN 1_input	P-CAN_Low	Interior antenna 3 (-)_output
36	ACC_input	P-CAN_High	Rear bumper antenna (-)_output
37	Power_battery (+)		-
38	ECU_battery (+)		-
39	Immobilizer antenna power_output		-
40	Immobilizer antenna ground_output		-

Description and operation

Description

Integrated Body Control Unit (IBU)

Integrated body control unit has integrated several functions including body control module (IBU), smart key unit (SMK), and tire pressure monitoring system (TPMS).

Body Control Module (IBU) Functions

Burglar Alarm

Trunk Burglar Alarm

Issues an alarm depending on the trunk operation.

Panic Alarm

Generates warning sound and displays flasher lamp (horn & flasher) depending on the panic signal.

Security Lamp Control

Controls security lamp in vehicle alert status.

Heating Wire

Door Mirror Heating Wire

The defogger and deicer function prevents and removes fog and frost from the mirror and window using the rear window heating wire switch (defogger switch).

Rear Window Heating Wire Control

External Lamp

Tail Lamp

Turns on / off the tail lamp automatically. It also turns off the tail lamp automatically when the driver forgot to turn off the lamp switch.

Auto Light

Turns on/off the tail lamp and head lamp automatically depending on whether it is day or night when the head lamp switch is placed at Auto.

Welcome Light

The welcome light function turns on the head lamp and tail lamp for 15 seconds when an unlock signal is detected while vehicle door is locked.

Escort Function

Turns on the escort lamp when the power is turned off while the head lamp is on.

–	It turns on the head lamp and maintains the state for 20 minutes if ignition is turned off while the head lamp is on.

–	The head lamp remains on only for 30 seconds when the driver seat door is opened and closed during the 20-minute period.

–	The head lamp turns off when remote control lock button is pressed twice while the head lamp is on.

Head Lamp (Low Beam / High Beam)

Controls high beam / low beam depending on the head lamp switch (multi-functional switch).

Daytime Driving Light Control

Controls the daytime driving light lamp depending on the conditions at the time of vehicle start.

Internal Lamp

Engine Start Maintenance Button Lamp

Turns on/off the SSB lamp depending on vehicle power conditions, door open / closed status, and alert mode.

Room Lamp

Turns on/off the interior lamp depending on vehicle power conditions and door open / closed status.

Rheostat

Controls the brightness of interior electrical lamps (instrument cluster, HUD, AVN, etc.) depending on rheostat switch input.

Steering Wheel Heating Wire

Steering Wheel Heating Wire Control

Controls steering wheel heating wire based on steering wheel heating wire switch.

Trunk

Trunk Release Control

Releases the trunk lock and issues a warning depending on the trunk switch input.

Front / Rear Parking Assist

PAS Display

Receives a signal from parking assist sensor through LIN communication and displays it on the instrument cluster.

PAS Warning

Detects obstacles in front and rear sides using the parking assist sensor (PAS sensor) in the case of gear input (R or D) and issues a warning if there is an obstacle.

Warning

Seat Belt Reminder and Indicator Lamp

Issues a warning if the seat belt is not fastened, and prevents pattern activation if the vehicle is driven while the seat belt is not fastened.

Key Reminder Warning

Issues a warning if the driver seat door is open while ACC is on.

Parking Brake Warning

Generates a warning sound if vehicle speed exceeds 5 km/h while IGN is on and parking brake is on.

Sunroof Open Warning

Issues a warning if the key is removed and the driver leaves the vehicle while the sunroof is open.

Wiper and Washer

Wiper (Low / High / Mist / Auto)

IBU receives wiper switch signal via B-CAN and sends the data to wiper motor (embedded) via LIN communication.

Front Washer

IBU sends the washer switch signal to front washer motor.

Smart Key Unit (SMK) Functions

SMK	Door Lock and Unlock	Locks/Unlocks the door based on the door unlock signal and the signal from push buttons on the driver seat / passenger seat outside handles.
	SMK Welcome Light	Controls door mirror and puddle lamp after smart key authentication when the driver with smart key approaches the vehicle.
	Smart Trunk	Opens the trunk if the driver with valid smart key stays in front of the rear bumper (within LF antenna range) for 3 seconds or more.
SMK Warning	Key Reminder 1	When the driver attempts to lock the door, it checks if there is a smart key inside the vehicle and unlocks the door if there is one.
	Key Reminder 2	Checks the door lock status for 0.5 seconds after the vehicle door is closed and unlocks the door and generates a warning sound using the external buzzer if the door is locked.
	Door Lock Warning 1	Generates a warning sound with the external buzzer if the driver tries to leave the vehicle while ACC or IGN is on.
	Door Lock Warning 2	Generates a warning sound with the external buzzer if the driver tries to lock the door and leave the vehicle while one or more doors are open.
	Door Lock Warning 3	Searches for a smart key inside the vehicle when the driver tries to lock the door, and issues a warning and does not lock the door if there is a smart key inside.
	Key Out Lamp Warning	If the vehicle moves at 3 km/h or less while ACC or IGN is on and the door is open, it searches for the smart key every 3 seconds and blinks the warning lamp if there is no smart key.
SMK RKE (Remote Keyless Entry)	Door Lock / Unlock	Locks/Unlocks the door based on the door unlock signal and the signal from push buttons on the driver seat / passenger seat outside handles.
	Panic	Performs vehicle panic and panic stop functions based on the panic button signal.
	Window Open	Opens/Closes vehicle window based on the smart key signal.
Engine Start		Start Stop Button (SSB), Immobilizer, Start Relay Power Control, SSB Lamp Control

Tire Pressure Monitoring System (TPMS) Functions

Tire pressure monitoring system continuously monitors pressure and temperature inside the tire in order to warn the driver of the changes in tire pressure that may have influence on vehicle driving conditions. TPMS control module analyzes the data from the WE (Wheel Electronic) sensor attached inside each wheel and determines the tire conditions and generates a signal that is necessary for warning lamp control.

Communication Network Diagram

Abbreviation	Explanation
ACU	Airbag Control Unit
MDPS	Motor Driven Power Steering
LKA	Land Keeping Assist
BCW	Blind-Spot Collision Warning
IBU	Integrated Body Control Unit
ICU	Integrated CentrAl Control Unit
MTC	Manual Temp Control
DATC	Dual Automatic Temp Control
ODS	Occupant Detection System
PCU	Powertrain control module
ABS	Anti-Lock Braking System)

Repair procedures

Diagnosis With KDS

In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (KDS).

The diagnostic system (KDS) 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 'Integrated body control unit (IBU)' 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.	To forcibly actuate the input value of the module to be checked, select option 'Actuation Test'.

5.	If you want to change user option, select "User Option".

Removal

1.	Disconnect the negative (-) battery terminal.

2.	Remove the crash pad center lower panel. (Refer to Body - "Crash pad center lower panel")

Disconnect the connector (A), then remove the IBU (B) after loosening the bolt and nuts.

Tightening torque : 9.6 - 9.8 N·m (0.7 - 1.0 kgf·m, 5.1 - 7.2 lb·ft)

Installation

1.	Install in the reverse order of removal.

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