Hyundai Santa Fe: Integrated Body Control Unit (IBU) / Description and operation

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Body Electrical System / Integrated Body Control Unit (IBU) / Description and operation

Description
Body Control Module Controls The Followings
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Wiper & Washer Control
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Defroster Control
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Driving Control
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Tailgate Control
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Window Control
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Interior Control
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Exterior Control
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Panic alarm Control
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MTS
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Flasher output Control
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Door lock/unlock Control
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Burglar alarm Control
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Remote start Control
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UMS(User Mode Setting) Control
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Gateway/ Diagnosis
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.
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.
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It turns on the head lamp and maintains the state for 20 minutes if ignition is turned off while the head lamp is on.
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The head lamp remains on only for 30 seconds when the driver seat door is opened and closed during the 20-minute period.
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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
 Foot Lamp
 Turns on/off the foot lamp depending on the power conditions and whether the shift lever is at the P position.
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.
Mood Lamp
 Turns on/off the mood lamp depending on user settings.
Rheostat
 Controls the brightness of interior electrical lamps (instrument cluster, HUD, AVN, etc.) depending on rheostat 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
IBU
 Interated Body Control Unit
DDM
 Driver Door Module
PTGM
 Power Tail Gate Module
ICU
 Interated Control Unit
PCU
 Powertrain Control Unit
ECU
 Engine Control Unit
CLU
 Cluster
MDPS
 Moter Driven Power Steering
SVM
 Sorround View Monitor
ACU
Airbag Control Unit
VDC
Vehicle Dynamic Control
SCC
 Smart Cruise Control
DBL
 Dynamic banding Light
LKA
 Lane Keeping Assist
BCW
 Blind-Spot Collision Warning
RVM
 Rear View Monitor
SAS
 Steering Angle Sensor
HUD
 Head up Display
TCU
 Transmission Control Unit
MTC
 Temp Control
DATC
Dual Automatic Temp Control
4WD
 Four Wheel Drive
F/PUMP
 Fuel Pump Control Module
V/PUMP
 Vacuum Pump
OCS
 Occupant Classification System
WPC
 Wireless Power Chager
IMS
 Integrated Memory System
AMP
 Amplifier
AVN
Head Unit (Audio / AVN)
HUD
 Head Up Display

    Integrated Body Control Unit (IBU)

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    Components and components location

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