2015 Isuzu NQR Fuse Box Diagram & Amperage

Quick Answer

The 2015 Isuzu NQR typically has two main fuse box locations: one under the hood and one inside the cabin, usually behind a kick panel on the driver's side.

Under-Hood Fuse Box

This fuse box is located in the engine compartment, usually near the battery or mounted on one of the fender wells. It contains fuses and relays for critical engine functions, lights, and other high-current accessories.

Relays in the Under-Hood Fuse Box:

• R1: Starter Relay
• R2: Fuel Pump Relay
• R3: Headlight Relay (Low Beam)
• R4: Headlight Relay (High Beam)
• R5: A/C Compressor Relay
• R6: Blower Motor Relay

Cabin Fuse Box (Driver's Side Kick Panel)

This fuse box is located inside the cabin, typically on the driver's side, often behind a removable kick panel or cover near the door sill or under the dashboard. It manages power for interior accessories, radio, wipers, and other cabin functions.

Relays in the Cabin Fuse Box:

• CR1: Accessory Relay
• CR2: Wiper Motor Relay

Note: Fuse locations and amperage ratings can vary slightly depending on the specific trim level and optional equipment of your 2015 Isuzu NQR. Always consult the fuse diagram printed on the inside of your fuse box lid or your vehicle's owner's manual for the most accurate information.

How to Test a Fuse

Testing a fuse is a quick and straightforward process:

1. Locate the Fuse Box: Identify the fuse box related to the circuit you suspect has a problem.
2. Identify the Suspect Fuse: Refer to the fuse diagram in your owner's manual or on the fuse box lid to find the fuse for the non-working component.
3. Visual Inspection: Most modern fuses have a clear plastic body, allowing you to see the metal filament inside. If the filament is broken or burnt, the fuse is blown and needs replacement.
4. Use a Test Light or Multimeter: For a more reliable test, especially on fuses where the filament isn't easily visible, use a test light or multimeter.
   • With the circuit powered (key in ACC or ON position, depending on the circuit): Touch one probe of the test light to each of the small metal test points on the top of the fuse. If the light illuminates on both sides, the fuse is good. If it only illuminates on one side or not at all, the fuse is blown.
   • With the circuit unpowered (battery disconnected or fuse removed): Use a multimeter set to continuity or resistance mode. Touch the probes to each end of the removed fuse. A good fuse will show continuity (a beep or very low resistance), while a blown fuse will show an open circuit (no beep or infinite resistance).
5. Replace if Necessary: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Never use a fuse with a higher amperage rating, as this can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

On a commercial vehicle like the Isuzu NQR, certain fuses might be more prone to blowing due to heavy usage or specific conditions. Here are a few common ones and what to check first:

• Cigar Lighter / 12V Power Outlet Fuse (C2 - 15A): This fuse frequently blows due to overcurrent from charging multiple devices, using high-power accessories, or a faulty accessory. Check for shorted accessories plugged into the outlet first.
• Blower Motor Fuse (F11 - 30A): A struggling blower motor (due to a clogged cabin filter), a faulty blower motor resistor, or a short in the wiring can cause this fuse to blow. If your blower fan only works on high or not at all, investigate these components.
• Headlight Fuses (F5, F6, F7, F8 - 10A/15A): While less common, a short in the headlight wiring, a faulty bulb, or an issue with the headlight switch could cause these to blow. Check the bulbs first, then inspect the wiring for any visible damage.
• Trailer Brake Controller Fuse (F15 - 20A): If you frequently tow and use a trailer brake controller, this fuse can blow due to issues with the trailer's wiring, a short in the controller itself, or an overload. Disconnect the trailer and check the wiring of the controller.
• Radio / Infotainment Fuse (C1 - 10A): Issues with the radio, aftermarket installations, or even a short in the antenna circuit can cause this fuse to blow. If your radio is dead, check for any recently installed devices.

Always address the root cause of a blown fuse rather than just replacing it, as a persistent short can lead to more significant electrical problems.

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