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Servicing the Electrical System

WARNING: This page is about a different car, the 2021 Kia Soul. However, it is still accessible from the selected car via links, so may be relevant.
  1. Prior to servicing the electrical system, be sure to turn off the ignition switch and disconnect the battery ground cable.
    NOTE: If the battery cable is removed during MFI or ELC diagnosis, any diagnostic trouble code saved by the computer will be cleared. Therefore, if necessary, record the diagnostic data before disconnecting the battery cable.
    G13280155Courtesy of KIA MOTORS AMERICA, INC.
  2. Attach the wiring harnesses with clamps so that there is no slack. However, for any harness which passes the engine or other vibrating parts of the vehicle, allow some slack within a range that does not allow the engine vibrations to cause the harness to come into contact with any of the surrounding parts and then secure the harness by using a clamp.
    G13280156Courtesy of KIA MOTORS AMERICA, INC.
  3. If any section of a wiring harness interferes with the edge of parts, or a corner, wrap the section of the harness with electrical tape or equivalent to protect it from damage.
    G13280157Courtesy of KIA MOTORS AMERICA, INC.
  4. When installing any parts, be careful not to pinch or damage any of the wiring harness.
    G13280158Courtesy of KIA MOTORS AMERICA, INC.
  5. Never throw relays, sensors or electrical parts, or expose them to strong impact.
    G13280159Courtesy of KIA MOTORS AMERICA, INC.
  6. The electronic parts used in the computer, relays, etc. are readily damaged by heat. If there is a need for service operations that may raise the temperature above 80°C (176°F), remove the electronic parts beforehand.
    G13280160Courtesy of KIA MOTORS AMERICA, INC.
  7. Loose connectors cause problems. Make sure that the connectors are always securely fastened.
    G13280161Courtesy of KIA MOTORS AMERICA, INC.
  8. When disconnecting a connector, hold the connector halves instead of pulling on the wires.
    G13280162Courtesy of KIA MOTORS AMERICA, INC.
  9. Disconnect connector with a latch by pressing in the direction of the arrows shown in the illustration.
    G13280163Courtesy of KIA MOTORS AMERICA, INC.
  10. Connect connector with the latch by inserting it until a click sound is heard.
    G13280164Courtesy of KIA MOTORS AMERICA, INC.
  11. When using a circuit tester to check continuity or voltage on connector terminals, insert the test probe into the harness side. If the connector is a sealed connector, insert the test probe through the hole in the rubber cap until it reaches the terminal. During this, be careful not to damage the insulation of the wires.
    G13280165Courtesy of KIA MOTORS AMERICA, INC.
  12. To avoid overloading the wiring, select the appropriate wire size based on the electrical current load of the optional equipment.
    Nominal size SAE gauge No. Permissible current
    In engine compartment Other areas
    0.3mm2 AWG 22 - 5A
    0.5mm2 AWG 20 7A 13A
    0.85mm2 AWG 18 9A 17A
    1.25mm2 AWG 16 12A 22A
    2.0mm2 AWG 14 16A 30A
    3.0mm2 AWG 12 21A 40A
    5.0mm2 AWG 10 31A 54A
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