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

Kia Optima DL3 2019-2024 Service and Repair Manual / Body Electrical System / Integrated Body Control Unit (IBU)

Components and components location

Component Location

1. Integrated Body Control Unit (IBU)

Schematic diagrams

Connector and Terminal Function

[Non-Smart key]

Pin	Function
Pin	Connector A	Connector B
1	-	Front washer switch (Output)
2	Rear seat belt indicator_Left (Output)	-
3	-	Key solenoid (Output)
4	-	Key in switch (Input)
5	-	Key inter lock switch (Input) / 'P' : Position switch
6	Rear seat belt indicator_Center (Output)	Wiper parking switch (Input)
7	-	-
8	Rear seat belt indicator_Right (Output)	Brake switch (Input)
9	-	-
10	Headlamp high switch (Input)	Front wiper volume switch (Input)
11	-	Key hole illumination (Output)
12	-	LIN4 (Safety ECU)
13	Rear view switch (Input)	PAS Option (Input)
14	-	-
15	RPAS Power (Output)	B-CAN (Low)
16	FRAS Power (Output)	B-CAN (High)
17	PAS/RPAS Power (Input)	-
18	-	Ground (Power)
19	-	-
20	Ground (ECU)	Immobilizer power (Output)
21	-	Immobilizer ground (Output)
22	K-Line_Immobilizer	Start inhibit relay
23	-	PAS/RPAS Switch indicator (Output)
24	-	Front wiper switch (Input)
25	Sunroof status (Input)	-
26	PAS/RPAS Switch (Input)	Multifunction switch ground (Input)
27	ATM Solenoid (Output)	Wiper power relay (Output)
28	-	Auto light sensor ground (Output)
29	LIN2 (ROA)	Auto light sensor signal (Input)
30	LIN1 (PDW-F or PDW-R)	Auto light sensor power (Output)
31	Door unlock signal (For IFU) EMS (Output)	-
32	Light switch (Input)	Front wiper high relay (Output)
33	Fog switch (Input)	Front wiper low relay (Output)
34	IGN2 (Input)	Front wiper low backup switch (Input)
35	IGN1 (Input)	P-CAN (Low)
36	ACC (Input)	P-CAN (High)
37	Battery + (ECU)
38	Battery + (Power)
39	-
40	Front heated nozzle (Output)

[Smart key]

Pin	Function
Pin	Connector A	Connector B	Connector C	Connector D
1	-	Front washer switch (Output)	-	Driver outside handle switch (Input)
2	Rear seat belt indicator_Left (Output)	-	ESCL Enable (Output)	Assist outside handle switch (Input)
3	-	-	ESCL - (Output)	-
4	-	-	-	-
5	External buzzer (Output)	-	-	RPM (Input)
6	Rear seat belt indicator_Center (Output)	Wiper parking switch (Input)	-	SSB symbol illumination (+) (Output)
7	Puddle pocket lamp (Output)	-	ESCL Unlock switch (Input)	ACC relay (Output)
8	Rear seat belt indicator_Right (Output)	Brake switch (Input)	-	IGN1 relay (Output)
9	-	-	-	IGN2 relay (Output)
10	Headlamp high switch (Input)	Front wiper volume switch (Input)	ESCL + (Output)	Starter relay (Output)
11	-	-		Assist outside handle antenna (+) (Output)
12	-	LIN4 (Safety ECU)		Interior antenna 2 (+) (Output)
13	Rear view switch (Input)	PAS Option (Input)		Trunk interior antenna 3 (+) (Output)
14	-	-		Interior antenna 1 (+) (Output)
15	RPAS Power (Output)	B-CAN (Low)		Bumper antenna (+) (Output)
16	FRAS Power (Output)	B-CAN (High)		Driver outside handle antenna (+) (Output)
17	PAS/RPAS Power (Input)	-		-
18	-	Ground (Power)		-
19	-	-		-
20	Ground (ECU)	Immobilizer power (Output)		-
21	-	Immobilizer ground (Output)		SSB switch 1 (Input)
22	K-Line_Immobilizer	-		SSB switch 2 (Input)
23	-	PAS/RPAS Switch indicator (Output)		Clutch IGN lock switch
24	-	Front wiper switch (Input)		ESCL COM
25	Sunroof status (Input)	-		Wheel speed sensor (Input)
26	PAS/RPAS Switch (Input)	Multifunction switch ground (Input)		-
27	ATM Solenoid (Output)	Wiper power relay (Output)		-
28	LIN3 (Rain sensor)	Auto light sensor ground (Output)		-
29	LIN2 (ROA)	Auto light sensor signal (Input)		-
30	LIN1 (PDW-F or PDW-R)	Auto light sensor power (Output)		Start feed back (Input)
31	Door unlock signal (For IFU) EMS (Output)	-		Assist outside handle antenna (-) (Output)
32	Light switch (Input)	Front wiper high relay (Output)		Interior antenna 2 (-) (Output)
33	Fog switch (Input)	Front wiper low relay (Output)		Trunk interior antenna 3 (-) (Output)
34	IGN2 (Input)	Front wiper low backup switch (Input)		Interior antenna 1 (-) (Output)
35	IGN1 (Input)	P-CAN (Low)		Bumper antenna (-) (Output)
36	ACC (Input)	P-CAN (High)		Driver outside handle antenna (-) (Output)
37	Battery + (ECU)			-
38	Battery + (Power)			-
39	-			-
40	Front heated nozzle (Output)			'P' Position (input)

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

Tailgate Burglar Alarm

Issues an alarm depending on the Tailgate 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.

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 5 minutes if ignition is turned off while the head lamp is on.

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

–	The head lamp remains on only for 15 seconds when the driver seat door is opened and closed during the 5-minute period

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.

Tailgate

Tailgate Release Control

Releases the Tailgate lock and issues a warning depending on the Tailgate 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 directly from MFSW and controls the wiper motor directly using a relay.

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	SMK Welcome Light	Controls door mirror and puddle lamp after smart key authentication when the driver with smart key approaches the vehicle.
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.
SMK RKE (Remote Keyless Entry)	Panic	Performs vehicle panic and panic stop functions based on the panic button 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.

Repair procedures

Inspection

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 force actuate the input value of the module to be checked, select option 'Actuation Test'.

Adjustment

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

Removal

1.	Disconnect the negative battery terminal.

2.	Remove the heater control unit. (Refer to Heating, Ventilation and Air Conditioning- "Heater Control Unit")

3.	Disconnect the blower motor connector (A).

4.	Remove the IBU (A) by loosening the mounting nuts.

5.	Disconnect all connectors (A) from the IBU.

Installation

1.	Install in the reverse order of removal.

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