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: Smart Cruise Control Operation
Operating conditions
Basic function
Smart Cruise Control operates when the
following conditions are met:
The gear is in D (Drive).
Your vehicle speed is within the
operating speed range.
- 5-110 mph (10-180 km/h): When
there is no vehicle in front
- 0-110 mph (0-180 km/h): When ...
Hyundai Tucson (NX4) 2022-2025 Owner's Manual: Navigation-based Smart Cruise
Control Settings
Highway Auto Speed Change
With the ignition switch ON, go to
Setup > Vehicle > Driver Assistance >
Driving Convenience > Highway Auto
Speed Change (for infotainment system
type) from the Settings menu to turn
Navigation-based Smart Cruise Control
on and off.
Information
...