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

Hyundai Santa Fe (TM) 2019-2023 Service and Repair 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

    Components (1) With Smart Key Connector Pin Information No Connector A Connector B Connector C 1 Fuel door release switch_input GND_ECU Front wiper relay (Low)_output 2 Fuel door open switch_input PDW-F power_output ESCL (+)_output 3 GND_Power ESCL (-)_output Start relay_output 4 PDW-R_Power_Output Front wiper high relay_output IGN1 relay_output 5 EMS ECU wake up_output PDW-R switch IND_output Immobilizer antenna power_output 6 Rear washer switch_input P-Position_input Immobilizer antenna ground_output 7 LIN4 (Rear seat remind) - - 8 P_CAN (Low) Rear view switch_input Driver outside handle antenna(+)_output 9 P_CAN (High) - Interior1 antenna (+)_output 10 - Wheel speed sensor_input Front bumper antenna (+)_output 11 B_CAN (Low) - Tailgate3 antenna(+)_output 12 B_CAN (High) 3rd line sheet belt indicator RH_output - 13 SSB switch_input - Passenger outside handle antenna(+)_output 14 Driver handle antenna switch_input Rear center seat belt indicator_output Immobilizer K-Line 15 P-Position_input (PWM) Fuel door open relay_output Bumper antenna (+)_output - 16 Fog switch_input - Interior antenna2(+)_output 17 Light switch_input Auto light sensor signal_input IGN2_input 18 Front wiper INT volume switch_input Auto light sensor power_output IGN1_input 19 Multifunction switch_input ATM solenoid_output IGN2 relay_output 20 Assist mirror unfolding switch_oupout Puddle pocket lamp_output Battery_power 21 Assist mirror (Horizontal)_output - Brake switch_input 22 Front washer switch_input SSB ring illumination_output Start feedback_input 23 Front wiper low switch_Input piezo buzzer_output - 24 LIN1 (PDW) SSB symbol illumination_output Driver outside handle antenna (-)_output 25 LIN2 (Safety ECU) Fuel door close relay_output Interior1 (-)_outputDriver outside handle antenna (-)_output 26 LIN3 (Rain sensor) Wiper power relay_output Front bumper antenna (-)_output 27 PDW-R power_input Rear seat belt indicator RH_output Passenger outside handle antenna (-)_output 28 PDW_input Rear seat belt indicator LH_output ESCL COM 29 SSB switch1_input 3rd line sheet belt indicator LH_output Tailgate3 antenna(-)_output 30 ESCL unlock_input Rear wiper relay_output ESCL Enable_output 31 Passenger outside handle switch_input Auto light sensor ground_output Bumper antenna (-)_output 32 PDW switch_input Wiper parking switch_input Interior antenna2 (-)_output 33 Sun roof Status_input ACC_input 34 Head lamp switch_input Mirror power_input 35 Front wiper switch_input ACC relay_output 36 Rear wiper switch_input Battery (+)_ECU 37 Assist mirror folding RH_output 38 Assist mirror (Vertical)_output Without Smart Key Connector Pin Information No Connector A Connector B Connector C 1 Fuel door release switch_input GND_ECU Front wiper relay (Low)_output 2 Fuel door open switch_input PDW-F power_output - 3 GND_Power - - 4 PDW-R_Power_Output Front wiper high relay_output - 5 EMS ECU wake up_output PDW-R switch IND_output Immobilizer antenna power_output 6 Rear washer switch_input - Immobilizer antenna ground_output 7 LIN4 - Kline_IMMO 8 P_CAN (Low) - - 9 P_CAN (High) - - 10 - - - 11 B_CAN (Low) - - 12 B_CAN (High) 3rd line sheet belt indicator RH_output - 13 - - - 14 Key inter lock siwtch_input(PWM) Rear center seat belt indicator_output - 15 Key inter lock siwtch_input Fuel door open relay_output - 16 Fog switch_input - - 17 Light switch_input Auto light sensor signal_input IGN2_input 18 Front wiper INT volume switch_input Auto light sensor power_output IGN1_input 19 Multifunction switch_input ATM solenoid_output - 20 Aisst mirror unfolding switch_oupout - Battery_power 21 Right side mirror (Horizontal)_output - Brake switch_input 22 Front washer switch_input Key hole illumination_output - 23 Front wiper low switch_Input - Start relay_output 24 LIN1 (PDW) - Start inhibit relay_output 25 LIN2 (Safety ECU) - Key solenoid_output 26 LIN3 (Rain sensor) Fuel door close relay_output - 27 PDW-R power_input Rear seat belt indicator RH_output - 28 - Rear seat belt indicator LH_output - 29 Key in switch_input 3rd line sheet belt indicator LH_output - 30 RVM switch_input Rear wiper relay_output - 31 - Auto light sensor ground_output - 32 PDW switch_input Wiper parking switch_input - 33 Sun roof Status_input ACC_input 34 Head lamp switch_input Mirror power_input 35 Front wiper switch_input - 36 Rear wiper switch_input Battery (+)_ECU 37 Mirror folding RH_output 38 Assist Mirror (Vertical)_output

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