What is a car fuse box and where is it located?

A car fuse box is an electrical distribution center that houses fuses and relays protecting your vehicle's electrical circuits. Most vehicles have multiple fuse boxes: the main box is typically located under the hood near the engine, while the interior panel is usually under the dashboard on the driver's side or beneath the steering wheel. Consult your owner's manual or our fuse diagrams to find the exact location for your specific make and model. Knowing your fuse box location is essential for troubleshooting electrical problems and performing maintenance.

How do I read a fuse box diagram?

Fuse box diagrams show the location and amperage rating of each fuse and relay. Each position is numbered and labeled with the circuit it protects (headlights, wipers, power windows, etc.) and the fuse's amperage rating (5A, 10A, 15A, 20A, etc.). The diagram indicates whether positions contain fuses or relays. Color-coded fuses help identify amperage: blue for 15A, yellow for 20A, red for 10A, and brown for 7.5A. Our detailed diagrams include this information for every vehicle, making it easy to identify the correct fuse for any circuit.

What does an amperage rating mean on a fuse?

A fuse's amperage rating indicates how much electrical current it can safely handle before blowing. Common ratings include 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, and 40A. Higher-amperage fuses protect circuits with greater power demands like the alternator or starter motor. Lower ratings protect sensitive circuits like dashboard lights or power windows. Never use a fuse with a higher amperage rating than specified, as this can allow excessive current through the circuit, creating fire hazards and damaging electrical components. Always replace blown fuses with the exact amperage specified in your vehicle's diagram.

Why does my fuse keep blowing?

A repeatedly blown fuse indicates an underlying electrical problem requiring investigation. Common causes include short circuits in wiring, failing electrical components, water damage in connectors, or improper installation of aftermarket equipment. Never simply replace the fuse multiple times without addressing the root cause. Start by checking the affected circuit for loose connections, damaged wiring, or burned components. If the problem persists, consult a professional mechanic. Our fuse box diagrams help you identify which circuit is problematic, allowing you to pinpoint the issue quickly and prevent vehicle damage or fire hazards.

How do I safely replace a blown fuse?

To safely replace a blown fuse: (1) Turn off the engine and all electrical systems. (2) Locate the fuse box using our diagram. (3) Find the blown fuse by examining the filament inside—a blown fuse appears darkened or broken. (4) Note the amperage rating on the fuse. (5) Remove the blown fuse using the provided fuse puller tool or carefully with your fingers. (6) Insert a new fuse with the exact same amperage rating. (7) Start the engine to verify the circuit works. If the replacement fuse blows immediately, don't replace it again—seek professional service. Our detailed diagrams ensure you find the correct fuse position quickly.

What's the difference between a fuse and a relay?

Fuses are passive protection devices that melt and break the circuit when current exceeds safe levels, preventing damage and fire. Relays are electromagnetic switches that control high-power circuits using low-power signals from switches. Fuses protect circuits from overcurrent, while relays switch circuits on and off or redirect power. Fuse boxes contain both components, and our diagrams identify which positions contain fuses and which contain relays. Understanding this distinction helps you troubleshoot problems: a blown fuse indicates overcurrent issues, while a relay failure causes the circuit to not respond to control switches.

Where can I find the fuse diagram for my specific vehicle?

ProCarManuals provides comprehensive fuse box diagrams for thousands of vehicle makes and models organized by year. Use our search feature to find your specific vehicle by make, model, and year. We cover Acura, Honda, Toyota, Ford, Chevrolet, BMW, Mercedes, Audi, and many other manufacturers. Each diagram shows the fuse box location, circuit labels, amperage ratings, and detailed explanations. Our guides help you quickly locate the fuse you need, understand circuit functions, and troubleshoot electrical problems. If you can't find your vehicle, contact our support team for assistance.

What electrical problems can I diagnose with a fuse diagram?

Fuse diagrams help diagnose non-functioning circuits by showing which fuse protects which system. If your headlights don't work, find the headlight fuse position in the diagram and check if it's blown. Same for power windows, wipers, interior lights, power seats, and other electrical features. A blown fuse indicates an overcurrent condition in that circuit. Non-blown fuses with non-functioning components suggest relay failure, wiring problems, or failed switches. Our detailed diagrams identify circuit names and their locations, allowing you to systematically troubleshoot electrical issues before seeking expensive professional service. Replace blown fuses with correct amperage ratings and investigate repeated failures.

Are fuse boxes the same in all model years of the same vehicle?

Fuse box layouts often change between model years, even for the same vehicle make and model. Engine updates, added safety features, new electrical systems, and design revisions cause manufacturers to modify fuse configurations. A 2020 Honda Civic may have a different fuse box layout than a 2015 Civic. ProCarManuals provides separate diagrams for each model year to ensure accuracy. Always consult the diagram for your specific year to find the correct fuse positions. Incorrect fuse selection from a different year could damage circuits or create safety hazards. Our organized, year-specific diagrams prevent these mistakes.

What should I do if my vehicle has multiple fuse boxes?

Most vehicles have at least two fuse boxes: the main underhood panel near the engine and an interior panel under the dashboard. Some vehicles have additional fuse boxes in the rear, under seats, or in other locations. Our comprehensive diagrams identify every fuse box location in your vehicle and provide separate diagrams for each one. The underhood box typically protects engine-related circuits (fan, fuel pump, ignition), while the interior box protects comfort and convenience features (windows, lights, wipers, seats). Identifying which fuse box contains the circuit you need prevents wasting time searching. Always consult all relevant diagrams when troubleshooting electrical problems in multi-box systems.

Can I use a higher amperage fuse to prevent future blown fuses?

Never use a fuse with higher amperage than specified. Doing so creates serious safety risks. Higher-amperage fuses allow excessive current through circuits designed for lower power, causing wire overheating, component damage, and potential fires. If a fuse blows, it indicates the circuit is drawing more current than safe, often due to shorts, failing components, or improper modifications. Installing a higher-amperage fuse masks the problem rather than solving it. Always replace fuses with the exact amperage rating shown in your vehicle's fuse diagram. If a replacement fuse blows immediately, investigate the underlying electrical fault. Professional diagnosis prevents damage and ensures vehicle safety.

Holden Trax, Car Fuse Box, Holden

Holden Trax 2017-2020 Fuse Box Diagram – Location, Fuses & Relay Assignments

By Todd Mitchell

On: Tuesday, August 5, 2025 12:58 PM

In this article we take a look at the first-generation Holden Trax (TJ, facelift) produced from 2017 to 2020. Here you will find the fuse box diagrams for the 2017, 2018, 2019 and 2020 Holden Trax, get information on the location of the fuse boxes inside the car and learn about the assignment of each fuse (fuse layout) and relay.

Passenger Compartment Fuse Box

Fuse Box Location

The interior fuse block is located in the glove box.

holden trax 2017 2020 fuse layout 1 2024 12 16 13 47 11

Open the glove box.
Squeeze the top outer edges of the glove box towards the centre and lower downwards.
Release the damper on the left side of the glovebox.

Fuse Box Diagram

holden trax 2017 2020 fuse layout 2 2024 12 16 13 47 25

Assignment of the fuses in the dashboard

№	Description
F1	BCM 1
F2	BCM 2
F3	BCM 3
F4	BCM 4
F5	BCM 5
F6	BCM 6
F7	BCM 7
F8	BCM 8
F9	DLIS
F10	SDM B+
F11	DLC
F12	HVAC MDL
F13	L/GATE RLY
F14	CGM
F15	2018-2020: LDW Gentex
F16	–
F17	ESCL B+
F18	2017: UPA B+ / SBZA BT 2018-2020: PAS / SBZA
F19	BCM RVC
F20	Clock Spring
F21	2017: AC APO 2018-2020: APO AC / PRNDL
F22	2017: DC APO 2018-2020: APO DC FRT
F23	–
F24	–
F25	2018: OnStar
F26	2018: EVP
F27	2017: IPC 2018-2020: IPC PTC RLAD
F28	2018-2020: TRLR Feed2
F29	–
F30	–
F31	IPC B+
F32	Audio / Nav
F33	2018-2020: TRLR Feed1
F34	PEPS Module
S/B01	2018-2020: PTC 1
S/B02	2018-2020: PTC 2
S/B03	PWR WNDW MTR FRT
S/B04	PWR WNDW REAR
S/B05	Logistic Mode RLY
S/B06	2018-2020: PWR Seat DR
S/B07	–
S/B08	Trailer Interface Module
Relays
RLY1	ACC/RAP
RLY2	L/GATE
RLY3	–
RLY4	Blower
RLY5	Logistic Mode

Engine Compartment Fuse Box

Fuse Box Location

To disengage the cover, lift upwards and remove.

holden trax 2017 2020 fuse layout 3 2024 12 16 13 47 38

Fuse Box Diagram

holden trax 2017 2020 fuse layout 4 2024 12 16 13 47 49

Assignment of the fuses in the engine compartment

№	Description
F1	Sunroof
F2	OSRVM SW, Rain Sensor, PWR Window Driver
F3	–
F4	–
F5	EBCM Valve
F6	–
F7	ESCL
F8	TCM B+
F9	–
F10	HDLP Leveling SW, HDLP Leveling MTR LH/RH, Rear Vision Camera ISRVM
F11	Rear Wiper
F12	RR WDW Defog
F13	–
F14	OSRVM Heat
F15	–
F16	Heated Seat Module
F17	2017: Compass Module, TIM R/C 2018: Compass Module, TIM DC/DC Converter FSCM R/C 2019-2020: TIM
F18	ECM R/C, TCM R/C, FICM R/C
F19	Fuel Pump
F20	–
F21	Fan RLY (AUX BEC)
F22	–
F23	Ignition Coil, Injector Coil
F24	Washer Pump
F25	–
F26	2017: Canister Purge SOL, Water Valve SOL, Turbo Wastegate SOL, Turbo Bypass SOL, O2 Sensor Pre/Post 2018-2020: EMS Var-1
F27	–
F28	–
F29	ECM PT IGN-1, IGN-2
F30	2017: MAF Sensor 2018-2020: EMS Var-2
F31	High Beam LH
F32	High Beam RH
F33	ECM B+
F34	Horn
F35	A/C Clutch
F36	Front Fog Lamp
FU1	EBCM Pump
FU2	FRT Wiper
FU3	Blower
FU4	IEC R/C
FU5	–
FU6	–
FU7	–
FU8	Cooling Fan Low/Mid
FU9	Cooling Fan High
FU10	EVP
FU11	Starter SOL
SP	Spare Fuses
Relays
1	Run Crank
2	Fuel Pump
3	2018-2020: Cooling Fan Mid
4	–
5	PT Relay
6	Cooling Fan High
7	Starter
8	Cooling Fan Low

Auxiliary relay box

To disengage the cover, lift upwards and remove.

holden trax 2017 2020 fuse layout 5 2024 12 16 13 47 57

№	Relays
RLY01	ELECTRIC VACUUM PUMP
RLY02	COOLING FAN 1
RLY03	COOLING FAN 2
RLY04	–

Luggage Compartment Fuse Box

Fuse Box Location

The rear compartment fuse box is located in the passenger side of the rear compartment. To remove the cover, pull outwards.

holden trax 2017 2020 fuse layout 7 2024 12 16 13 48 34

Fuse Box Diagram (2017)

holden trax 2017 2020 fuse layout 8 2024 12 16 13 48 41

Assignment of the fuses in the trunk (2017)

№	Description
F1	–
F2	–
F3	–
F4	–
F5	–
F6	–
F7	–
F8	–
F9	–
F10	–
F11	–
F12	–
F13	–
F14	–
F15	–
F16	–
F17	Spare
F18	–
S/B01	–
S/B02	–
S/B03	–
S/B04	AC DC INV
S/B05	–
S/B06	–
S/B07	–
S/B08	–
Relays
RLY1	–
RLY2	–

Fuse Box Diagram (2018-2020)

holden trax 2017 2020 fuse layout 9 2024 12 16 13 48 49

Assignment of the fuses in the trunk (2018-2020)

№	Description
F1	2018: Amplifier
F2	2018: RDCM
F3	–
F4	2018: NOX Soot
F5	2018: NOX Soot/Heater Pipe
F6	2018: SCRPM
F7	2018: SCRPM
F8	–
F9	–
F10	–
F11	–
F12	–
F13	–
F14	–
F15	–
F16	–
F17	–
SB1	2018: DC/DC
SB2	2018: DC/DC
SB3	DC/AC Inverter
SB4	2018: NOX Heater Pipe
SB5	–
Relays
RLY1	–
RLY2	–
RLY3	2018: ECM/NOX Soot
RLY4	2018: ECM/NOX Heater Pipe
RLY5	–