Experiencing issues with your 2003 Infiniti G35 not starting and an OBD2 scanner failing to connect can be frustrating. A common culprit, and often a simple fix, is a blown fuse. When your Infiniti G35 refuses to start and you can’t pull any diagnostic trouble codes due to a failed OBD2 connection, checking the fuses related to the OBD2 system and engine control unit (ECU) should be one of your first steps.
The fuse that powers the OBD2 port and the ECU is crucial for both diagnostics and engine operation. If this fuse is blown, it can lead to a no-start condition, a non-functional service engine soon light, and an inability to communicate with the car’s computer using an OBD2 scanner. While fuse box layouts can sometimes vary slightly, for a 2003 Infiniti G35, you should focus on checking fuses in both the interior fuse box, typically located near the driver’s side footwell, and the engine compartment fuse box, usually situated near the battery.
Specifically, you’ll want to identify fuses labeled for “ECM,” “Engine Control,” “IGN,” “ECU,” or even “OBDII” if explicitly mentioned. Refer to your 2003 Infiniti G35 owner’s manual for the precise fuse box diagrams and fuse designations. The owner’s manual will provide the most accurate location and labeling for these critical fuses.
Once you’ve located the fuse boxes, visually inspect each fuse related to the engine control system and OBD2. Look for a broken filament within the fuse. If you identify a blown fuse, replace it with a fuse of the exact same amperage rating. Using a fuse with a higher amperage can potentially damage other electrical components.
If replacing the blown fuse resolves the issue, it’s still wise to consider why the fuse blew in the first place. While a one-time fuse failure can occur, repeated blown fuses indicate a potential underlying electrical problem that requires further investigation. If the problem persists after replacing the fuse, or if you are unsure about which fuses to check, it’s recommended to consult a qualified automotive technician to diagnose the root cause of the no-start and OBD2 connection problems in your 2003 Infiniti G35. They will have the expertise and tools to pinpoint electrical faults and ensure your vehicle is properly repaired.
