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

Kia Forte 2019-2020 (BD) Service Manual / Body Electrical System / Integrated Body Control Unit (IBU)

Specifications
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
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).

1.

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.

2.

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

3.

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
1.

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")

3.

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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