Back Up Lamp Switch Inspection
WARNING: This page is about a different car, the 2011 Suzuki SX4. However, it is still accessible from the selected car via links, so may be relevant.
Reference: BACK UP LAMP SWITCH REMOVAL AND INSTALLATION
Check backup lamp switch for function using ohmmeter.
Back up lamp switch specification
Switch ON (Push): Continuity
Switch OFF (Release): No continuity