OBD will not link up

Follow this test,

Scan tool will not communicate > no communication with all systems:

Turn ignition off. Measure voltage between ground and OBD-II Data Link Connector (OBD-II DLC) terminal No. 16 (White wire). If battery voltage exists, go to next step. If battery voltage does not exist, repair or replace connectors and/or wiring between OBD-II DLC and fusible link No. 2 (60-amp) in engine compartment relay box.
Check for continuity between ground and OBD-II DLC terminals No. 4 (Black wire) and No. 5 (Black wire). If continuity exists at each terminal, repair or replace scan tool as necessary. If continuity does not exist at either terminal, repair wiring between ground and OBD-II DLC.