Locate the interior power block under the dashboard and verify each circuit using the printed layout before replacing any burned insert. Match the amperage rating exactly to prevent wiring damage or malfunction of connected components.
This vehicle uses multiple distribution units, including a cabin module and an engine compartment unit. Each slot corresponds to a specific system such as lighting, audio, climate control, or ignition circuits, with ratings typically ranging from 10A to 40A depending on load.
The interior unit handles lower and medium current circuits, while high-demand systems like cooling fans, ABS, and power steering rely on relays and high-capacity links in the engine bay. Identifying the correct layout allows fast isolation of faults such as non-working accessories or intermittent power loss.
Check both sides of each insert with a multimeter to confirm continuity, as internal breaks are not always visible. Loose contacts, oxidation, or heat marks near terminals often indicate the source of electrical issues rather than failure of the component itself.
2012 Infiniti FX35 Fuse Box Diagram and Circuit Reference
Verify each slot in the interior electrical unit against the printed chart on the cover and confirm amperage before replacing any failed insert.
The cabin distribution block groups circuits by function, with control modules, interior lighting, and infotainment typically assigned to 10A–15A positions, while seat motors, power outlets, and window systems use 20A–30A ratings.
Each numbered position corresponds to a dedicated circuit path. For instance, one slot feeds the audio amplifier, another supports the HVAC control unit, and another routes power to ignition-related systems. Accurate mapping prevents cross-installation and repeated faults.
Test each insert using a multimeter set to continuity mode. A working component shows a closed circuit, while a failed one reads open. This method detects internal breaks that are not visible through the plastic housing.
The engine bay unit manages higher-load systems such as cooling fans, ABS modules, and steering assist. These circuits often use larger capacity elements and relay integration to handle increased current demand.
If repeated failures occur in the same position, inspect wiring harnesses near moving parts like door joints, seat rails, and under-hood routing points where insulation may wear and create short circuits.
Install only matching amperage values and ensure firm contact within each slot to maintain stable current flow and prevent overheating or intermittent electrical loss.
Exact Fuse Box Locations in Cabin and Engine Bay FX35
Check the driver-side lower dashboard area first, just above the footwell near the kick panel, where the main interior electrical unit is mounted behind a plastic cover.
To access it, follow these steps:
- Open the driver door fully
- Move the seat back for clearance
- Locate the small trim cover near the left knee area
- Pull the cover outward to expose the slot array
This cabin unit handles most low and mid-current circuits such as interior lighting, infotainment, and control modules. Labels are printed on the reverse side of the cover for quick identification.
The second interior unit may be positioned deeper behind the dash or near the passenger side, depending on configuration, and is used for additional control systems and relays.
Under the hood, locate the main power distribution center on the right side near the battery housing.
- Release the locking tabs on the plastic lid
- Lift the cover upward
- Check the layout printed inside the lid
This engine compartment unit supports high-load systems such as cooling fans, ABS, and power steering. Larger cartridge-style inserts and relays are grouped here.
Ensure all covers are reinstalled securely after inspection to prevent moisture entry and maintain stable electrical connections.