Servicing The Electrical System

WARNING: This page is about a different car, the 2017 Genesis G90. However, it is still accessible from the selected car via links, so may be relevant.

Prior to servicing the electrical system, make sure to turn off the ignition switch and disconnect the battery ground cable.
- In the course of MFI or ELC system diagnosis, when the battery cable is removed, any diagnostic trouble code retained by the computer will be cleared. There fore, if necessary, record the diagnostic data before removing the battery cable.
Fig 1: Disconnecting Battery Ground Cable
Courtesy of HYUNDAI MOTOR AMERICA
Fix the wiring harnesses with clamps so that there is no slack wiring. 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.

Fig 2: Fixing Wiring Harnesses Using Clamps
Courtesy of HYUNDAI MOTOR AMERICA
If any section of a wiring harness interferes with the edge of a part, or a corner, wrap the section of the harness with tape or something similar in order to protect it from damage.

Fig 3: Wrapping Tape To Damage Area
Courtesy of HYUNDAI MOTOR AMERICA
When installing any parts, be careful not to pinch or damage any of the wiring harness.

Fig 4: Caution For Pinch Or Damage Of Wiring Harness
Courtesy of HYUNDAI MOTOR AMERICA
Never throw relays, sensors or electrical parts, or expose them to strong shock.

Fig 5: Caution For Throw Relays, Sensors Or Electrical Parts
Courtesy of HYUNDAI MOTOR AMERICA
The electronic parts used in the computer, relays, etc. are easily damaged by heat. If there is a need for service operations that may cause the temperature to exceed 80°C (176°F), remove the electronic parts beforehand.

Fig 6: Caution For Electronic Parts Used In Computer And Relays
Courtesy of HYUNDAI MOTOR AMERICA
Loose connectors may cause malfunction. Make sure that the connectors are always securely fastened.

Fig 7: Loosing Connectors May Cause Malfunction
Courtesy of HYUNDAI MOTOR AMERICA
When disconnecting a connector, be sure to grip only the connector, not the wires.

Fig 8: Caution For Disconnecting Connector
Courtesy of HYUNDAI MOTOR AMERICA
Disconnect connectors which have catches by pressing in the direction of the arrows shown in the illustration.

Fig 9: Disconnecting Connectors
Courtesy of HYUNDAI MOTOR AMERICA
Connect connectors which have catches by inserting the connectors until they make a clicking sound.

Fig 10: Connecting Connectors
Courtesy of HYUNDAI MOTOR AMERICA
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 the probe contacts the terminal, being careful not to damage the insulation of the wires.

Fig 11: Checking Continuity Or Voltage Connector Terminals Using Tester
Courtesy of HYUNDAI MOTOR AMERICA
To avoid overloading the wiring, take into consideration the electrical current load of the optional equipment when determining the appropriate wire size.

Recommended size	SAE gauge No	Permissible current
		In engine compartment	Other areas
0.3 mm²	AWG 22	-	5A
0.5 mm²	AWG 20	7A	13A
0.85 mm²	AWG 18	9A	17A
1.25 mm²	AWG 16	12A	22A
2.0 mm²	AWG 14	16A	30A
3.0 mm²	AWG 12	21A	40A
5.0 mm²	AWG 10	31A	54A