Hyundai Elantra (CN7): Smart Key System / Smart Key Diagnostic

Hyundai Elantra (CN7) 2021-2025 Service Manual / Body Electrical System / Smart Key System / Smart Key Diagnostic

Repair procedures

Inspection
Self Diagnosis With Scan Tool
It will be able to diagnose defects of SMART KEY system with Diagnostic tool quickly. Diagnostic tool can operates actuator forcefully, input/output value monitoring and self diagnosis.
The following three features will be major problem in SMART KEY system.
1.
Problem in SMART KEY unit input.
2.
Problem in SMART KEY unit.
3.
Problem in SMART KEY unit output.
So the following three diagnosis operates will be the major problem solution process.
4.
SMART KEY unit Input problem : switch diagnosis
5.
SMART KEY unit problem : communication diagnosis
6.
SMART KEY unit Output problem : antenna and switch output diagnosis
Switch Diagnosis
1.
In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (Diagnostic tool).
The diagnostic system(Diagnostic tool) provides the following information.
(1)
Fault Code Searching : Checking failure and code number (DTC)
(2)
Data Analysis : Checking the system input/output data state
(3)
Actuation test : Checking the system operation condition
(4)
S/W Management : Controlling other features including system option setting and zero point adjustment
2.
If diagnose the vehicle by Diagnostic tool, select "DTC Analysis" and "Vehicle".

3.
If check current status, select the "Data Analysis" and "Car model".

4.
Select the SMK' to be checked in order to check the vehicle with the tester.

5.
You can see the situation of each switch on scanner after connecting the "current data" process.
Display
Description
FL Toggle SW
ON : Push button is ON in the driver door handle.
FR Toggle SW
ON : Push button is ON in the assist door handle.
Tailgate open SW
ON : Tailgate button is ON.
Gear P Position
ON : Shift lever is P position.
IGN 1
ON : IGN switch is IG position.
ACC
ON : IGN switch is ACC position.
Brake SW
ON : Brake switch is ON.

Fault Code Searching
1.
Fault code searching that the each linked components operates normal.
2.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
3.
Select the 'Fault Code Searching' and 'Car model'.

Antenna Actuation Diagnosis
1.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
2.
Select the 'Actuation Test' and 'Car model'.

3.
Set the smart key near the related antenna and operate it with a Diagnostic tool.

4.
Set the smart key near the related antenna and operate it with a Diagnostic tool.
5.
If the LED of smart key is blinking, the smart key is normal.
6.
If the LED of smart key is not blinking, check the voltage of smart key battery.
7.
Antenna actuation
–
Interior Antenna 1
–
Interior Antenna 2
–
Bumper Antenna
–
Driver Door Antenna
–
Assist Door Antenna
Antenna Status Check
1.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
2.
Select the 'S/W Management' and 'Car model'.

3.
Select the 'Smart Key Unit' and 'Antenna Status Check'.

4.
Set the smart key near the related antenna and operate it with a Diagnostic tool.

5.
If the smart key runs normal , the related antenna, smart key (transmission, reception) and exterior receiver are normal.
6.
Antenna status
–
Interior Antenna 1
–
Interior Antenna 2
–
Bumper Antenna
–
Driver Door Antenna
–
Assist Door Antenna
FOB Status Check
1.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
2.
Select the 'S/W Management' and 'Car model'.

3.
Select the 'Smart Key Unit' and 'FOB KEY STATUS IMFORMATION'.

Smart Key Status Check
1.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
2.
Select the 'S/W Management' and 'Car model'.

3.
Select the 'Smart Key Unit' and 'SMK STATUS INFORMATION'.

Neutralization Status Check
1.
Connect the cable of Diagnostic tool to the data link connector in driver side crash pad lower panel.
2.
Select the 'S/W Management' and 'Car model'.

3.
Select the 'Smart Key Unit' and 'Neutralization Mode'.

    Components and components location Components (1)Connector Pin InformDation Pin no Connector A Connector B Connector C Connector D Connector E 1ESCL (+)_output----2Front heated nozzle_output----3-Puddle pocket lamp_output-Mirror folding_output-4Front washer switch _Input---5-LIN(PDW)--ESCL enable_output6Ground_PowerR-PDW power_input--RPM_input7Ground_ECUR-PDW power_output--Start relay_output8ESCL (-)_outputF-PDW power_output--ACC relay_output9Battery (+) ECUATM solenoid_output-Auto light sensor ground_outputStart feedback_input10Battery (+) PowerHead lamp high beam switch_input-Rear view camera switch_inputSSB switch2_input11IGN_InputFront washer switch _Input-R-PDW switch_inputTrunk antenna (-)_output12Kiline_IMMOFront wiper INT volume switch_input-P-Position_inputInterior2 antenna power(-)_output13-Wiper parking switch_input-Passenger outside handle switch_input-14-External buzzer_output-Multifunction Switch ground _InputPassenger outside handle antenna (-)_output15-R-PDW switch IND_output-ACC_input-16---IGN2_input-17--Front wiper low back up switch_input-18--Brake switch_inputDriver outside handle antenna (-)_output19---Immobilizer antenna ground_output20----21----22LIN 3(Rain sensor)-PDW option_input-23Wiper power relay_outputMirror unfolding_output-24---25Wiper low relay_output--26Wiper high relay_output-Wheel speed sensor_input27--IGN2 relay_output28Fog lamp switch_input-IGN1 relay_output29Light switch_inputAuto light sensor power_outputSSB symbol illumination(+)_output30-Auto light sensor signal_inputSSB switch1_input31-Sunroof status_inputTrunk antenna (+)_output32-ESCL unlock switch_inputInterior2 antenna power(+)_output33ESCL_COMClutch lock switch_input (MT)-34EMS ECU wake up_output/Dood unlock signal_outputDriver outside handle switch_inputPassenger outside handle antenna (+)_output 35-B-CAN High-36-B-CAN Low-37P-CAN High-38P-CAN LowDriver outside handle antenna (+)_output39-Immobilizer antenna power_output40-- Schematic diagrams Circuit Diagram Repair procedures RemovalSmart Key Unit (IBU)1.

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