Car Fuse Guide: Solve 80% of Car Electrical Problems Easily

By Magari Poa on 24/09/2025

When it comes to car troubles, most drivers think of the battery, alternator, or fuel system. However, in reality, up to 80% of electrical car issues are linked to a faulty fuse. For many Japanese and Korean cars (the most common in Kenya), understanding your fuse box can save you time, money, and stress.

This guide explains how to check fuses, replace them safely, and understand what each fuse means.

What is a Car Fuse and Why is it Important?

A car fuse is a small electrical safety device designed to protect your car's wiring and components. When there's a surge of electricity, the fuse blows (breaks), preventing damage to expensive systems such as the ECU, ABS, or airbags.

Ignoring a blown fuse can lead to major electrical malfunctions, so knowing how to handle them is crucial.

How to Check Car Fuses (Step-by-Step)

Turn Off the Car – Always switch off the ignition and ensure the front and rear lights are off.
Locate the Fuse Box – Most cars have one in the cabin (near the dashboard) and another in the engine bay.
Remove the Suspected Fuse – Use a fuse puller or small pliers.
Inspect the Fuse – If the wire inside is broken or the color looks burnt, the fuse is blown.
Replace with Correct Fuse – Always replace with the same amperage (A) and same color. Using a higher or lower amp fuse can damage your car's wiring or electronics.

Pro Tip: Never bypass a fuse with wire or foil. It may cause a fire.

Common Fuse Symbols and Their Functions (Japanese & Korean Cars)

Here's a quick reference list of common fuses and what they control.

Fuse Code	Function	Amperage
P/WDW-LH	Left power window	30A
P/WDW-RH	Right power window	30A
TAIL RH	Right tail light + front stair lamp	10A
RR HTR	Rear glass heater	30A
A/BAG	Airbag system	15A
CLUSTER	Dashboard cluster	10A
TAIL LH	Left tail light + number plate light	10A
AUDIO	Radio, mirror buttons, clock	10A
C/LIGHTER & P/OUTLET	Cigarette lighter + outlet	20A
RR FOG	Rear fog lamp	15A
HTD MIRR	Heated mirrors + motor	10A
IG COIL	Ignition/start fuse	20A
IMMO	Immobilizer (anti-theft)	10A
S/HTR	Seat heater	20A
A/CON SW	Air conditioning	10A
START	Starter, alarm, ignition key	10A
ECU-IG	Car computer (ECU/ignition)	15–20A
ABS	Anti-lock braking system	20A
SRS	Supplemental Restraint System (airbag)	15A
HEATER	Cabin heater	15–20A
GAUGE	Dashboard warning indicators	10A

Most fuse boxes also include 3 spare fuses for emergencies.

Common Car Problems Caused by Blown Fuses

Windows not rolling up/down ? Check P/WDW fuses (30A).
Radio and clock not working ? Likely AUDIO fuse (10A).
Headlights or tail lights out ? TAIL LH/TAIL RH fuse (10A).
Car won't start ? Could be IG COIL or START fuse.
Aircon not cooling ? A/CON SW or Ac/COMP fuse.
Dashboard warning lights always on/off ? CLUSTER or GAUGE fuse.
Airbag light on ? A/BAG or SRS fuse.

Why Fuse Care Matters for Kenyan Drivers

Kenya's roads are dusty, humid, and bumpy, which accelerates fuse wear and corrosion. In addition, many ex-Japan and ex-Korea cars have older wiring systems, making them more prone to electrical glitches.

By learning to identify and replace fuses correctly, you can:

Avoid unnecessary mechanic visits.
Extend the life of your car's electrical systems.
Drive safer, knowing critical systems (airbags, ABS, headlights) are functional.

Final Takeaway

Car fuses may be small, but they're the first line of defense for your car's electrical system. By knowing how to check and replace them, you'll solve most minor car issues quickly. Always ensure you use the correct amperage and never ignore a blown fuse.

Next time your radio, lights, or AC suddenly stop working, check your fuse box before rushing to a mechanic—you might save thousands of shillings!