Integrated Body Control Unit (IBU)
Components and Component Location
Component Location
| 1. Integrated Body Control Module (IBU) |
Circuit Diagrams
Connector and Terminal Function
[Non-Smart Key]
| Pin | Function | |
| 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 Interlock Switch (Input) / "P": Position Switch |
| 6 | Rear Seat Belt Indicator_Center (Output) | Wiper Park Switch (Input) |
| 7 | - | - |
| 8 | Rear Seat Belt Indicator_Right (Output) | Brake Switch (Input) |
| 9 | - | - |
| 10 | High Beam Headlamp Switch (Input) | Front Wiper Volume Switch (Input) |
| 11 | - | Key Hole Illumination (Output) |
| 12 | - | LIN4 (Security System ECU) |
| 13 | Reverse Switch (Input) | PAS Option (Input) |
| 14 | - | - |
| 15 | FRAS Power (Output) | B-CAN (Low) |
| 16 | PAS/RPAS 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 Reserve Switch (Input) |
| 35 | IGN1 (Input) | P-CAN (Low) |
| 36 | ACC (Input) | P-CAN (High) |
| 37 | Battery + (ECU) | |
| 38 | Battery + (Power) | |
| 39 | - | |
| 40 | Heated Injector (Output) | |
[Smart Key]
| Pin | Function | |||
| 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) | Outside Handle Auxiliary Switch (Input) |
| 3 | - | - | ESCL - (Output) | - |
| 4 | - | - | - | - |
| 5 | External Buzzer (Output) | - | - | RPM (Input) |
| 6 | Rear Seat Belt Indicator_Center (Output) | Wiper Park Switch (Input) | - | SSB Symbol Illumination (+) (Output) |
| 7 | Puddle 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 | High Beam Headlamp Switch (Input) | Front Wiper Volume Switch (Input) | ESCL + (Output) | Starter Relay (Output) |
| 11 | - | - | Outside Handle Auxiliary Antenna (+) (Output) | |
| 12 | - | LIN4 (Security System ECU) | Interior Antenna 2 (+) (Output) | |
| 13 | Reverse Switch (Input) | PAS Option (Input) | Trunk Interior Antenna 3 (+) (Output) | |
| 14 | - | - | Interior Antenna 1 (+) (Output) | |
| 15 | FRAS Power (Output) | B-CAN (Low) | Bumper Antenna (+) (Output) | |
| 16 | PAS/RPAS 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 Interlock 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 Feedback (Input) | |
| 31 | Door Unlock Signal (for IFU) EMS (Output) | - | Outside Handle Auxiliary 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 Reserve 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 | Heated Injector (Output) | "P" Position (Input) | ||
Description and Operation
Description
Integrated Body Control Unit (BCM)
The Integrated Body Control Unit has several functions, including the Intelligent Body Unit (IBU), Smart Key Module (SMK), and Tire Pressure Monitoring System (TPMS).
Intelligent Body Unit (IBU) Functions
Security Alarm Tailgate security alarm Sounds the alarm depending on the operation of the tailgate. 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. 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 the state for 5 minutes when the ignition is off and the headlamps are on.
The headlamps turn off when the lock button on the remote control is pressed twice while the headlamps are on.
The headlamps stay on for only 15 seconds when the driver's door is opened and closed within the 5-minute period.
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. Liftgate Tailgate open control Unlocks the tailgate lock and sounds a warning depending 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 directly from the MFSW and controls the wiper motor directly through the relays. 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. 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 within 0.5 seconds after the vehicle door is opened and closed, and sounds a warning 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. Starting the Engine Start/Stop Button (SSB), Immobilizer, Starter Relay Power Control, SSB Lamp Control 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 the driving conditions of the vehicle.
The TPMS control module analyzes data from the WE (Wheel Electronic) sensor. The sensor is mounted inside each wheel and determines the tire condition and generates the signal required to control the warning lamp.
Repair Procedures
Inspection
Diagnosis using KDS
In the body electrical system, faults can be quickly diagnosed using the Korean Diagnostic System (KDS).
The Diagnostic System (KDS) provides the following information.
Self-Diagnosis: Checks malfunction and Diagnostic Trouble Code (DTC)
Current Data: Check the system input/output status.
Actuation Test: Check the system operating status
Additional function: Control of other functions, including the setting parameter system and zero point adjustment.
Select "Vehicle Model" and "Integrated Body Control Unit (IBU)" to be checked in order to inspect the vehicle with the tester.
Select the "Current Data" menu to view the current input/output data status.
To forcibly activate the input value of the module under test, select the "Activation Test" option.
Adjustment
To change a user setting, select "User Settings".
Removal
Disconnect the negative battery cable.
Remove the heater control unit.
(Refer to Heating, Ventilation and Air Conditioning - Heater Control Unit)
Disconnect the blower motor connector (A).
Remove the IBU (A) by loosening the mounting nuts.
Disconnect all connectors (A) from the IBU.
Installation
Install in the reverse order of removal.
Test yourself
A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.