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OBD I Adaptor BOX Switch Wiring for X431 iDiag/ Diagun III/ IV How to use this cable? What is the function of this cable? You can use X431 iDiag with OBDI connector to diagnose car models older than 1996 year. If you want to diagnose car models before 1996 year, when you use OBDI connector, you need to use this cable, one end connects to..