Hyundai Sonata LF Quiz
Body Electrical System

Smart Key Unit Repair Procedures

In this manual: Body Electrical System
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
50steps
~300min
4/5difficulty
Done 0 of 50

Removal

Smart Key Unit
  1. Disconnect the negative (-) battery terminal.
  2. Remove the glove box. (Refer to Body - Glove Box Assembly Upper Cover)
  3. Remove the smart key unit (B) by disconnecting the connectors (A) and loosening the bolt and nut.
Interior 1 Antenna
Be careful not to scratch the airbag and related parts.
  1. Disconnect the negative (-) battery terminal.
  2. Remove the airbag center panel. (Heating, Ventilation and Air Conditioning - "Controller")
  3. Remove the interior 1 antenna (A) by loosening the mounting screws, then disconnect the connector (B).
  4. Disconnect the negative (-) battery terminal.
  5. Remove the rear console cover. (Refer to Body - "Rear Console Cover")
  6. Remove the interior antenna 2 (B) by first loosening the mounting screw (2EA) and disconnecting the connector (A).
  7. Disconnect the negative (-) battery terminal.
  8. Remove the rear cross trim. (Refer to Body - Luggage Compartment Trim)
  9. Remove the main antenna (B) after disconnecting the connector (A) and loosening the mounting nuts.
  10. Disconnect the negative (-) battery terminal.
  11. Remove the rear bumper cover. (Refer to Body - Rear Bumper Cover)
  12. Remove the rear bumper antenna (B) after disconnecting the connector (A) and loosening the mounting nuts.
  13. Disconnect the negative (-) battery terminal.
  14. Remove the front left wheel guard.
  15. Disconnect the connection, then remove the buzzer (A).
  16. Disconnect the negative (-) battery terminal.
  17. Remove the front door outside handle. (Refer to Body - Front Door Outside Handle)
  18. Disconnect the negative (-) battery terminal.
  19. Remove the trunk lid trim. (Refer to Body - "Trunk Lid Trim")
  20. Disconnect the trunk opener switch connector (A).
  21. Remove the trunk open switch by disconnecting the mounting clip.
Interior 2 Antenna, Mainline Antenna, Rear Bumper Antenna, Buzzer, Outside Door Handle, Trunk Open Switch

Inspection

Smart Key Unit (Refer to Smart Key System - Smart Key Diagnostics) Smart Key Switch (Refer to Smart Key System - Smart Key Diagnostics) Antenna (Refer to Smart Key System - Smart Key Diagnostics) Outside Door Handle
  1. Disconnect the front door outside handle connector (A).
  2. Check the continuity of the circuit between terminals No. 3 and No. 6.
    No Description
    1 Door Antenna (+)
    2 Pocket LED Light (+)
    3 Door Lock/Unlock Button
    4 Door Antenna (-)
    5 Pocket LED Light (-)
    6 Door Lock/Unlock Button Switch Ground

  3. Check the continuity of the circuit between the terminals of the luggage compartment door lock.
  4. If continuity is not as specified, inspect the switch.
Main Switch

Installation

Smart Key Unit
  1. Install the smart key unit.
  2. Install the smart key unit mounting bolts and connect the connector.
  3. Install the glove box.
  4. Connect the negative (-) battery terminal and check the smart key system.
  5. Install the interior 1 antenna.
  6. Install the center airbag panel.
  7. Connect the negative (-) battery terminal and check the smart key system.
  8. Install the interior 2 antenna.
  9. Install the rear console assembly.
  10. Connect the negative (-) battery terminal and check the smart key system.
  11. Roof Rack Antenna.
  12. Install the rear cross trim.
  13. Connect the negative (-) battery terminal and check the smart key system.
  14. Install the rear bumper antenna.
  15. Install the rear bumper cover.
  16. Connect the negative (-) battery terminal and check the smart key system.
  17. Install the outside handle.
  18. Install the front door outside handle.
  19. Connect the negative (-) battery terminal and check the smart key system.
  20. Install the luggage compartment opener switch.
  21. Install the luggage compartment rear trim.
  22. Connect the negative (-) battery terminal and check the smart key system.
Interior 1 Antenna, Interior 2 Antenna, Mainline Antenna, Rear Bumper Antenna, Outside Door Handle, Trunk Open Switch

Test yourself

A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.