Integrated Body Control Unit (IBU)

Specifications

Specifications

Components and Component Location

Component Location

[4DR]

[5DR]

Circuit Diagrams

Connector and Terminal Function

[Non-Smart Key]

[Smart Key]

Description and Operation

Description

Integrated Body Control Unit (IBU)

The Integrated Body Control Unit has several functions, including the Intelligent Body Unit (IBU), Smart Key Module (SMK), and Tire Pressure Monitoring System (TPMS).

1. 1

   Intelligent Body Unit (IBU) Functions

   Security Alarm	Trunk Security Alarm	Triggers the alarm depending on the bus operation.
   	Panic Alarm	Generates a warning sound and flashes the lamps (horn and hazard lights) depending on the panic signal.
   	Security Lamp Control	Controls the security lamp when the vehicle is in the alarm state.
   Heating wire	Door mirror heating wire	The defogging and defrosting function prevents and removes fog and frost from the mirrors and window using the rear window heater wire switch (heater switch).
   	Rear window heater wire control
   Exterior Lamps	Rear Lamp	Automatically turns the tail lamps on/off. It also turns off the tail lamps automatically when the driver has forgotten to turn off the lamp switch.
   	Auto Light	Automatically turns the tail lamps and headlamps on/off depending on whether it is day or night when the headlamp switch is in AUTO.
   	Welcome Light	The welcome light function turns on the headlamps and tail lamps for 15 seconds when the vehicle door unlock signal is detected while the vehicle is locked.
   	Follow-Me-Home Function	Turns on the follow-me-home lamps when the power is turned off while the headlamps are on. It turns on the headlamps and maintains their state for 20 minutes when the ignition is off and the headlamps are on. The headlamps remain on for only 30 seconds when the driver's seat door is opened and closed within a 20-minute period. The headlamps turn off when the lock button on the remote control is pressed twice while the headlamps are on.
   	Headlamp (Low/High Beam)	Controls the high/low beam depending on the headlamp switch (multifunction switch).
   	Daytime Running Light Control	Controls the daytime running lamps depending on the conditions at the time the vehicle is started.
   Interior Lamp	Engine Start/Stop Button (SSB) Lamp	Turns the SSB lamp on/off depending on the vehicle power conditions, door open/closed status and warning mode.
   	Map lamp	Turns the interior lamp on/off depending on the vehicle power status and door open/closed status.
   	Rheostat	Controls the brightness of interior electrical lamps (cluster, HUD, AVN, etc.) based on the dimmer rheostat switch input.
   Steering wheel heating wire	Steering wheel heating wire control	Controls the steering wheel heating wire based on the steering wheel heater wired switch.
   Trunk	Trunk release control	Releases the trunk lock and issues a warning based on the trunk switch input.
   Front/Rear Parking Assist	PAS Display	Receives the signal from the parking assist sensor via the LIN line and displays it on the instrument cluster.
   	PAS Warning	Detects obstacles at the front and rear with the parking assist sensors (PAS sensors) when reverse (R) or drive (D) is selected and warns if an obstacle is present.
   Warning	Unfastened Seat Belt Reminder and Indicator Lamp	Issues a warning if the seat belt is not fastened and prevents the vehicle from moving with the seat belt unfastened.
   	Key Reminder Warning	Issues a warning if the driver's seat door is open while the adaptive cruise control is on.
   	Parking brake warning	Generates an audible warning if the vehicle speed exceeds 5 km/h with the ignition on and the parking brake applied.
   	Sunroof Open Warning	Issues a warning if the key is removed and the driver leaves the vehicle with the sunroof open.
   Wiper and Washer	Wiper (Low / High / Intermittent / Auto)	The IBU receives the wiper switch signal over the B-CAN and sends data to the wiper motor (built-in) via LIN communication.
   	Front Washer	The IBU sends the washer switch signal to the front washer motor.

2. 2

   Smart Key Module (SMK) Functions

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

3. 3

   Tire Pressure Monitoring System (TPMS) Functions

   The Tire Pressure Monitoring System continuously monitors the pressure and temperature inside the tire to warn the driver of tire pressure changes that may affect vehicle driving conditions. The TPMS control module analyzes data from the Wheel Electronic (WE) sensor attached inside each wheel, determines tire condition, and generates the signal required to control the warning lamp.

Communication Network Diagram

Repair Procedures

Diagnosis using KDS

1. 1

   In the body electrical system, faults can be quickly diagnosed using the Korean Diagnostic System (KDS).

   The Diagnostic System (KDS) provides the following information.

   1. Self-Diagnosis: Checks malfunction and Diagnostic Trouble Code (DTC)

   2. Current Data: Check the system input/output status.

   3. Actuation Test: Check the system operating status

   4. Additional function: Control of other functions, including the setting parameter system and zero point adjustment.

2. 2

   Select "Vehicle Model" and "Integrated Body Control Unit (IBU)" to be checked in order to inspect the vehicle with the tester.

3. 3

   Select the "Current Data" menu to view the current input/output data status.

4. 4

   To forcibly activate the input value of the module under test, select the "Activation Test" option.

5. 5

   To change a user setting, select "User Settings".

   

   

   

   

   

Removal

1. 1

   Disconnect the negative (-) battery terminal.

2. 2

   Remove the center lower panel of the airbag.

   (Refer to Body - "Center Lower Panel")

3. 3

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

   Tightening torque: 9.6 - 9.8 N·m

   

Installation

1. Install in the reverse order of removal.