Back Up Light Switch Inspection
WARNING: This page is about a different car, the 2010 Suzuki Kizashi. However, it is still accessible from the selected car via links, so may be relevant.
Reference: BACK UP LIGHT SWITCH REMOVAL AND INSTALLATION
Check back up light switch function using ohmmeter.
Back up light switch specification
Switch ON (Push): Continuity
Switch OFF (Release): No continuity