1.Turn ignition switch OFF and disconnect the battery negative (-) terminal.
2.Remove the fuse box cover.
3.Remove the starter relay (A).

4.Check for continuity between the terminals (30 and 87) using an ohmmeter.
| Terminal | Resistance | Measure | ||
| 30 - 87 | 1 MΩ or higher | If there is continuity between the terminals, replace the relay. | ||

5.Apply 12V to the terminal 85 and ground to the terminal 86 and then check for continuity between the terminals (30 and 87).
| Terminal | Resistance | Measure | ||
| 30 - 87 | 1Ω or less | If there is no continuity between the terminals, replace the relay. | ||

6.Install the starter relay.
7. Install the fuse box cover.
Starter
Ignition SystemHyundai Tucson (NX4) 2022-2025 Owner's Manual: Electronic Parking Brake
(EPB) warning light. AUTO HOLD indicator light
Electronic Parking Brake
(EPB) warning light
This warning light illuminates:
When the ignition switch is in the
ON position. The EPB warning light
illuminates for about 3 seconds and
then goes off.
Whenever there is a malfunction with
EPB.
If the EPB warning light remains
...
Hyundai Tucson (NX4) 2022-2025 Service Manual: Spark Plug
- Description
A spark plug is a device for delivering electric current from an
ignition system to the combustion chamber of a spark-ignition engine to
ignite the compressed fuel/air mixture therein by means of an electric
spark, while containing combustion pressure within the engine. A spar ...