Do you have the STAR system error code? According to StarBrowser, (a module of DAS STAR), there are just 2 N2 component which are N2/2 and N2/4, the SRS and seat belt control module, (I think these are not the source of your problem). On the other hand it might be the STAR can not communicate with base CAN module, (this is another error code), hence it can not diagnose the ASR or other components errors, check the fuses on the top back side of the computer components box, some times one or more blown fuses can cause a communication error with STAR. If you can get a print out of the complete diagnostic session it would be useful to trace the error. Once the STAR communication is established it will be ready to check all components. Inappropriate voltage readings due to bad wires or connectors can cause errors in the STAR diag process. Check the big fat wire harness below and around the computer modules box for open circuits or shorts. The access to a STAR computer is a plus to diagnose this problem. The WIS, has plenty of leads once the codes are found.