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) 2022-2026 Service Manual: PTC Heater
- Description
The PTC (Positive Temperature Coefficient) heater is installed at the
exit or the backside of the heater core.The PTC heater is an electric
heater using a PTC element as an auxiliary heating device that
supplements deficiency of interior heat source in highly effective
diese ...
Hyundai Tucson (NX4) 2022-2026 Service Manual: Passenger Airbag (PAB) Module
- Description
The passenger airbag (PAB) is installed inside the crash pad and
protects the front passenger in the event of a frontal crash. The SRSCM
determines if and when to deploy the PAB.
• Never attempt to measure the circuit resistance of the airbag
module (squib ...