RepairPal Certified shops can diagnose and repair your 2003 Suzuki Vitara. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
The 1.6L 4 cylinder has a timing belt, you can find that and others here: http://www.gates.com/downloads/download_common.cfm?file=428-1466_web.pdf&folder=brochure