Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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When you have a U1000 code you need to start with that and ignore all other codes. The U100 is a CAN communication code. Meaning that a major control unit is not communicating. So a special scanner is used to perform CAN diagnostics to determine which control unit is not communicating. This will not be a do it your self type of scanner. Only a high level scanner can do this. Once you have determined what control unit is not communicating, then diagnostics is done to see if the control unit is bad or if it is a wiring issue.
That is your first step I am afraid.
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