Kia Optima: Fuses And Relays / Integrated Central Control Unit (ICU)

Kia Optima DL3 2019-2025 Service and Repair Manual / Body Electrical System / Fuses And Relays / Integrated Central Control Unit (ICU)

Components and components location

Component Location

1. Integrated central control unit (ICU)

Description and operation

Description

Integrated Central control Unit (ICU) combines both Smart Junction Block (SJB) and Integrated Gateway & Power Control Module (IGPM)

System Block Diagram

Function

Item		Function
Function	Switch input	Receives switch inputs and then sends the switch status to each module through CAN message.
	Lamp control	Controls lamp with the IPS by receiving command from IBU via CAN message.
	Internal relay control	Controls internal relay by receiving command from IBU via CAN message.
	External relay control	Controls external relay by receiving command from IBU via CAN message.
	Dark current shut off system	The system automatically shuts off the power to be provided with components for reducing useless dark current according to the vehicle operating conditions such as shipment and long-term parking.
	Trouble diagnosis	Diagnose status of loads controlled by IPS.
	Gateway	Transmits signals among the modules connected to the different networks in the vehicle.

※ The ICU does not judge logic, it is operated only by CAN commands of other modules.

▶ Self-Logic Function : Hazard lamp, Stop lamp, Tailgate room lamp, Steering heater, Door lock/unlock

Switch Input

1.	Operation Function ▶ Hazard lamp switch, Seat belt switch, Tailgate switch, Door switch, etc.

Operation Description

(1)	Determined switch operation status

(2)	Switch status messages are sent to other modules (IBU, CGW, DAU, PSM, etc.) via CAN communication.

IPS Lamp control

1.	Operation Function ▶ Headlamp low/high, Turn signal lamp, DRL lamp, Internal/External tail lamp, Stop lamp, etc.

Operation Description

(1)	Lamp on/off operation via CAN message of IBU

(2)	Detects current flowing through the lamp via IPS

(3)	Lamp OFF when over-current detection (PCL control : Cut current of lamp if reference current is exceeded)

Internal relay control

1.	Operation Function ▶ Burglar alarm horn, Tailgate, Power window, etc.

Operation Description

(1)	Relay on/off operation via CAN message of IBU

External relay control

1.	Operation Function ▶ Headlamp high solenoid, Rear fog, Rear Glass Defogger, etc.

Operation Description

(1)	Relay on/off operation via CAN message of IBU

Dark current shut off system

Operation Description

(1)	If the CAN and switch inputs are absent for a long time, the power output is turn off sequentially to prevent battery discharge.

(2)	If a CAN or switch input is received while the dark current shut off system is operating, the system is disabled for normal operation.

Repair procedures

Inspection

Fuse Inspection

1.	Check that the fuse holders are loosely held and that the fuses are securely fixed by the holders.

2.	Check that each fuse circuit has the exact fuse capacity.

Check the fuses for any damage.

If a fuse is to be replaced, be sure to use a new fuse of the same capacity. Always identify the cause of the blown fuse and completely eliminate the problem before installing a new fuse.

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 Central Control Unit (ICU)' 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'

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

Removal

1.	Disconnect the negative battery terminal.

2.	Remove the mood lamp unit. (Refer to Lighting System - "Mood Lamp Unit")

3.	Disconnect the ICU connectors (A).

4.	Remove the fixing clips (A).

5.	Remove the ICU (A) by loosening the mounting nuts.

6.	Disconnect the connectors (A) from the ICU and then remove the wiring mounting clips.

Installation

1.	Install in the reverse order of removal.

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