Download IVIS (Infiniti Vehicle Immobilizer System-NATS) 2003 Infiniti Q45 – Schematic – Diagrams: Other diagrams referred to by name within these diagrams can be found at Diagrams By Diagram Name. See: Diagrams By Diagram Name Diagnostic Strategies 1. Check the symptom and customer’s requests. 2. Understand the outline of system. 3. Perform the preliminary check. Refer to BL-70, “Preliminary Check”. See: Initial Inspection (Preliminary Check)Preliminary Check 4. Perform the communication inspection. If CONSULT-II is used, refer to BL-73, “IVMS COMMUNICATION INSPECTION”. See: Description of On-Board DiagnosticsWith Manufacturer’s Scan Tool (Infiniti CONSULT-II)IVMS Communication Inspection If CONSULT-II is not used, refer to BL-77, “COMMUNICATION DIAGNOSIS”. See: Displaying & Reading Trouble CodesWithout Scan ToolCommunication Diagnosis Procedure Is the communication diagnosis result OK? OK: GO TO step 7. NG: GO TO step 5. 5. Repair or replace depending on the diagnosis result.