Check ground point G302 at lower left side of power lift gate if okay get the integrated power module tested its located at left front of engine compartment,it supplies power to most exterior lights
Read the guide below on using a test light , it will help
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
Wiring diagram for your license plate light is attached below
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Monday, February 15th, 2010 AT 3:55 AM