Sometimes that can steer you wrong. Jumpering one end of a particular wire to machine frame ground then supplying batt+ via a fused 5A test light is a good way of loading a wire that can be hanging on by a thread and is a better test than a pure continuity measurement IMO. You can troubleshoot the Active Codes using the following procedures. Anywhere the procedure states to "check for an open harness" you can use the test light procedure above in addition to simply measuring resistance. I sent you the electrical schematic. Check your message inbox. 1945/1946 - Data link sensor test 4651/5885 - CAN data link test 5805 - Ethernet data link test.