No Communication With All Systems

Check voltage between DLC terminal No. 16 and ground. If battery voltage does not exist, check junction connectors and wiring harness between DLC and power supply. If battery voltage exists, check continuity between DLC terminal No. 4 and ground and between terminal No. 5 and ground. If continuity exists, replace scan tool. If continuity does not exist, check wiring harness between DLC and ground.