Abstract: This paper primarily addresses the self-test failure of the fuze transmitter during joint debugging of a certain product type, which resulted in the freezing of the joint debugging application and the inability to proceed with debugging tasks. Through reviewing technical documentation and conducting in-depth analysis, relevant information flow block diagrams and fault trees for the fuze transmitter were developed to clarify troubleshooting approaches. By systematically investigating at the system level, segment level, and component level, the cause of the self-test failure during joint debugging was identified. The issue was resolved.