2018 Mazda CX-9 Fuses and Fuse box | Checking and replacing fuses

2018 Mazda CX-9 Fuses and Fuse box | Checking and replacing fuses

The 2018 Mazda CX-9 comes equipped with a comprehensive electrical system that uses fuses to protect various components from electrical overloads. The fuse box, which is located inside the vehicle, is critical to the safety of the electrical circuits. Understanding how to check and replace fuses is critical for ensuring proper operation and troubleshooting electrical problems.

In this guide, we’ll look at where the fuse box is in the 2018 Mazda CX-9 and walk you through the process of checking and replacing fuses. Whether you’re dealing with a faulty component or simply performing routine maintenance, understanding the fundamentals of the vehicle’s fuse system allows you to address electrical issues efficiently. Let’s take a look at fuses and fuse boxes to help you gain knowledge and confidence in managing your Mazda CX-9’s electrical system.

2023 MAZDA CX-9 Specs, Price, Features, Mileage (Brochure)

Replacing the Fuses

Replacing the fuses on the vehicle’s left side

If the electrical system does not work, first inspect the fuses on the vehicle’s left side.

1. Make sure the vehicle power is switched off, and other switches are off.
2. Open the fuse panel cover.
   
3. Pull the fuse straight out with the fuse puller provided on the fuse block located in the engine compartment.
   
4. Inspect the fuse and replace it if it is blown.
   1. Normal
   2.  Blown
5. Insert a new fuse of the same amperage rating, and make sure it fits tightly. If it does not fit tightly, have an expert install it. Consult an Authorized Mazda Dealer.
   If you have no spare fuses, borrow one of the same rating from a circuit not essential to vehicle operation, such as the audio or accessory socket circuit.
   CAUTION
   Always replace a fuse with a genuine Mazda fuse or equivalent of the same rating. Otherwise, you may damage the electric system.
6. Reinstall the cover and make sure that it is securely installed.

Replacing the fuses under the hood

If the headlights or other electrical components do not work and the fuses in the cabin are normal, inspect the fuse block under the hood.
If a fuse is blown, it must be replaced. Follow these steps:

1. Make sure the vehicle power is switched off, and other switches are off.
2. Remove the fuse block cover.
   
3. If any fuse but the MAIN fuse is blown, replace it with a new one of the same amperage rating.
   1. Normal
   2. Blown
      WARNING
      Do not replace the main fuse by yourself. Have an Authorized Mazda Dealer perform the replacement.
      Replacing the fuse by yourself is dangerous because the MAIN fuse is a high-current fuse. Incorrect replacement could cause an electrical shock or a short circuit resulting in a fire.
      Do not replace the main fuse and multiplex slow blow fuse by yourself. Have an Authorized Mazda Dealer perform the replacement.
      Replacing these fuses by yourself is dangerous because they are high-current fuses. Incorrect replacement could cause an electrical shock or a short circuit resulting in a fire.
4. Reinstall the cover and make sure that it is securely installed.

Fuse Panel Description

Fuse block (Engine compartment)

DESCRIPTION		FUSE RATING	PROTECTED COMPONENT
1	WIPER.DEI	20 A	Windshield wiper de-icer*
2	IG2	30 A	For protection of various circuits
3	INJECTOR	30 A	Engine control system
4	―	―	―
5	P.WINDOW1	30 A	―
6	―	―	―
7	―	―	―
8	EVVT	20 A	Engine control system
9	DEFOG	40 A	Rear window defogger
10	―	―	―
11	R.HEATER	40 A	Air conditioner
12	EPB L	20 A	Electric parking brake (EPB) (LH)
13	AUDIO	40 A	Audio system
14	EPB R	20 A	Electric parking brake (EPB) (RH)
15	ENG.MAIN	40 A	Engine control system
16	ABS/DSC M	50 A	ABS, Dynamic stability control system
17		50 A	For protection of various circuits
18	WIPER	20 A	Front window wiper and washer
19	HEATER	40 A	Air conditioner

DESCRIPTION		FUSE RATING	PROTECTED COMPONENT
20	―	―	―
21	ENGINE.IG1	7.5 A	Engine control system
22	C/U IG1	15 A	For protection of various circuits
23	H/L LOW L	15 A	Headlight low beam (LH)
24	H/L LOW R1	15 A	―
25	ENGINE3	15 A	Engine control system
26	ENGINE2	15 A	Engine control system
27	ENGINE1	15 A	Engine control system
28	AT	15 A	Transaxle control system
29	H/CLEAN	20 A	―
30	A/C	7.5 A	Air conditioner
31	AT PUMP	15 A	―
32	STOP	10 A	Brake lights
33	R.WIPER	15 A	Rear window wiper
34	H/L HI	20 A	Headlight high beam
35	H/L LOW R2	15 A	Headlight low beam (RH)
36	FOG	15 A	Fog lights*
37		7.5 A	Engine control system
38	AUDIO2	7.5 A	Audio system*
39	INTERIOR	10 A	Overhead light
40	METER2	15 A	―
41	METER1	10 A	Instrument cluster
42	SRS1	7.5 A	Air bag
43	AUDIO4	10 A	Audio system*
44	AUDIO1	25 A	Audio system*
45	ABS/DSC S	30 A	ABS, Dynamic stability control system
46	―	―	―
47	ST.HEATER	15 A	Heated steering wheel*
48	TAIL	15 A	Parking lights
49	FUEL PUMP2	25 A	Fuel system
50	HAZARD	25 A	Hazard warning flashers, Turn signal lights, Taillights
51	DRL	15 A	Daytime running lights
52	R.OUTLET2	15 A	Accessory sockets
53	HORN	15 A	Horn
54	ROOM	25 A	For protection of various circuits

Fuse block (Left side)

DESCRIPTION		FUSE RATING	PROTECTED COMPONENT
1	P.SEAT D	30 A	Power seat*
2	P.WINDOW3	30 A	Power windows
3	R.OUTLET3	15 A	Accessory sockets
4	P.WINDOW2	25 A	Power windows
5	PLG	20 A	Power liftgate*
6	D.LOCK	25 A	Power door locks
7	SEAT WARM	20 A	Seat warmer*
8	SRS2/ESCL	15 A	Trailer hitch*
9	SUNROOF	10 A	Moonroof*
10	INTERIOR2	15 A	Audio system
11		7.5 A	Engine control system
12	MIRROR	7.5 A	Power control mirror
13	AT IND	7.5 A	AT shift indicator
14	F.OUTLET	15 A	Accessory sockets
15	R.OUTLET1	15 A	Accessory sockets*
16	―	―	―

DESCRIPTION		FUSE RATING	PROTECTED COMPONENT
17	M.DEF	7.5 A	Mirror defogger*
18	R.SEAT.WARM	20 A	Seat warmer*
19	AUDIO3	15 A	Audio system
20	―	―	―
21	P.SEAT P	30 A	Power seat*

FAQs

Useful Links

 

View Full PDF: 2018 Mazda CX-9 Owner’s Manual| Auto User Guide

2023 MAZDA CX-9 Specs, Price, Features, Mileage (Brochure)

2018 Mazda CX-9 Instrument Cluster and Display | How to use