Hyundai Sonata LF Quiz
Body Electrical System

Relay Box (Interior) 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
18steps
~108min
4/5difficulty
Done 0 of 18

Fuse Inspection

  1. Make sure that there is no play in the fuse holders and that the fuses are securely installed.
  2. Is the rating of the fuse specified correctly for each circuit?
  3. Is any fuse blown?
    If a fuse must be replaced, be sure to use a new fuse of the same capacity. Always determine why the fuse blew first and completely eliminate the problem before installing a new fuse.

Diagnosis with GDS

  1. The body electrical system can be quickly diagnosed for faulty parts using the Global Diagnostic System (GDS). The GDS provides the following information.
    1. 1) Self-diagnosis: Check the diagnostic trouble code (DTC) and display.
    2. 2) Current data: Check the input/output status of the system.
    3. 3) Actuator test: Check the operating status of the system.
    4. 4) Additional functions: Other controls such as system option and zero point adjustment.
  2. Select "Vehicle Model" and the system to be checked to inspect the vehicle with the tester.
  3. Select "Smart Junction Box (SJB)".
  4. Select the "Current Data" menu to check the current input/output status. The input/output data for the sensors related to the Smart Junction Box (SJB) can be checked.
  5. If you force-check the power door lock operation, select "Activation Check".
  6. To change a user setting, select "User Settings".

Removal

  1. Disconnect the negative (-) battery terminal.
  2. Remove the emergency pad lower panel. (Refer to Body - "Emergency Pad Lower Panel")
  3. Disconnect the connectors on the fuse side of the Intelligent Junction Block.
  4. Remove the Intelligent Junction Block (A) after loosening the mounting nuts.
  5. Disconnect the connectors from the rear side of the intelligent junction box.

Installation

  1. Install the smart junction box.
  2. Install the emergency pad lower panel.
  3. Connect the negative (-) battery terminal.
  4. Make sure that the entire system operates normally.

Test yourself

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