The reverse light switch is located on the transmission as part of the gear range sensor/switch. Here are the wiring diagrams for the system and the sensor/switch location in the images below. Please let us know if you need anything else to get the problem fixed.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.