Check the interior electrical panel under the dashboard first, as most circuit faults originate there; match each slot number with its labeled function before removing any component to avoid disabling working systems.
The engine compartment contains a second power distribution unit near the battery that controls high-load systems such as cooling fans, ignition modules, and charging circuits. Disconnect the negative battery terminal before accessing this area to reduce risk of short circuits.
Each protective element is rated for a specific amperage, typically ranging from 5A to 50A in this vehicle. Installing a higher-rated part may overheat wiring, while a lower-rated one may fail during normal operation. Always use the same amperage value printed on the component.
Use a puller tool or insulated pliers to remove components and inspect the internal metal strip for breaks or burn marks. A broken strip confirms failure, even if the outer casing appears intact.
If multiple systems stop working at once, inspect shared circuits such as accessory power or ignition-controlled lines. Refer to the slot layout chart to trace connected components and identify the exact position linked to the issue.
2018 Infiniti Q50 Fuse Box Diagram Guide
Locate the interior power distribution panel under the driver-side dashboard and verify each slot using the printed layout on the cover; align slot numbers with circuit labels before removing any component to prevent disabling unrelated systems.
Check amperage ratings stamped on each protective element and inspect them using a puller tool; a broken or darkened internal strip indicates failure, and replacement must match the original rating exactly to avoid wiring damage or repeated faults.
Interior Fuse Panel Location and Slot Function Mapping
Remove the lower trim beneath the steering column to access the interior electrical panel; pull the cover outward carefully to reveal the numbered layout printed on the reverse side, then match each position with its assigned circuit before handling any component.
Use the slot mapping to identify systems such as lighting, infotainment, power outlets, and window controls, and verify amperage values marked on each element; incorrect selection can lead to circuit overload or repeated failure during normal vehicle operation.