Oil Pressure Switch Inspection
WARNING: This page is about a different car, the 2006 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
Reference: OIL PRESSURE SWITCH REMOVAL AND INSTALLATION
Use an ohmmeter to check switch continuity.
Oil pressure switch specifications
During engine running: No continuity (∞Ω)
At engine stop: Continuity (0 Ω)