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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! The connections will correlate to the wires, so UI means User Interface, UI3 would mean User Interface 3 wires, etc. Can you post a picture of the connectors you have left over? The F73 is not a valid error code, so I suspect it is a control issue due to the improper inputs from the wires you connected to the EXP SERVICE connection, which is likely only used during programming.