Electrical Diagnosis
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.
For ignition switch electrical troubleshooting, see Ignition, Engine, Emission and 4WD Control System Circuit Diagram in SYSTEM WIRING DIAGRAMS (Grand Vitara) and SYSTEM WIRING DIAGRAMS (XL-7).