Complete Car Fuse Code Meanings Based on Color & Amperage

Understanding the meaning of car fuse codes is essential for every vehicle owner. By knowing the codes shown on each fuse, you can inspect, replace, or maintain your vehicle’s electrical system more accurately. Using an incorrect fuse—such as one with the wrong amperage—can increase the risk of electrical damage and even lead to safety issues.

This article is designed to help you understand car fuse codes. Read the full explanation below.

What Is a Car Fuse and Why Are Its Codes So Important?

A car fuse is a safety component in a vehicle’s electrical system that functions as an automatic circuit breaker when excessive electrical current occurs. A fuse is designed to blow first before excess current damages more expensive or high-risk components, such as the ECU, electric motors, or lighting systems.

In practice, car fuses play a critical role in preventing short circuits and maintaining electrical stability. When a current surge exceeds the specified limit, the wire inside the fuse melts and cuts off the electrical flow. This mechanism protects the circuit from overheating and serious damage.

It is important to note that fuses differ from other electrical components such as fusible links and relays. Fusible links are typically used for high-current protection and act as the main safeguard for certain electrical systems, while relays function as electrical switches that control current flow to specific components. Fuses, on the other hand, are designed to provide direct protection against overcurrent in individual circuits.

Car Fuse Code Meanings Based on Amperage

In a vehicle’s electrical system, car fuse codes based on numbers indicate the amperage (A) or the maximum electrical current a fuse can handle before it blows.

The higher the amperage rating, the greater the electrical load the fuse can protect. Each vehicle component is therefore equipped with a fuse rated according to its power requirements.

Examples of Car Fuse Codes Based on Amperage

• 10A (10 Amps): Commonly used for light loads such as turn signals, interior lights, and small accessories.
• 15A (15 Amps): Typically used for medium electrical systems, such as car audio, charging sockets, or certain control systems.
• 30A or higher: Used for high-power systems such as radiator fans, air conditioning, and power windows.
• By understanding car fuse codes based on amperage, you can ensure that the electrical system operates safely, stably, and in accordance with manufacturer standards.

Car Fuse Code Meanings Based on Color

In addition to amperage numbers, car fuse codes can also be identified by fuse color. Colors serve as a quick visual indicator of the amperage rating a fuse can handle. This color-coding system follows international standards, making it easier for technicians and vehicle owners to identify fuses without having to read the small numbers printed on them.

By understanding car fuse color codes, you can quickly determine whether the installed fuse matches the electrical requirements of your vehicle. Choosing the wrong color—and therefore the wrong amperage—can cause fuses to blow easily or fail to protect electrical components.

General Guide to Car Fuse Color Codes by Amperage

• Black: 1 A
• Gray: 2 A
• Purple: 3 A
• Brown: 5 A
• Light Brown (Tan): 7.5 A
• Red: 10 A
• Blue: 15 A
• Yellow: 20 A
• White / Clear: 25 A
• Green: 30 A
• Orange: 40 A

Note: These color standards generally apply to blade-type fuses, which are the most commonly used in modern vehicles. Always verify compatibility with your vehicle manufacturer’s specifications.

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Car Fuse Code Meanings in the Cabin Area

Inside the vehicle cabin, there are several fuses identified by letter codes, each protecting a specific electrical system. It is important to note that these letter codes indicate circuit functions shown on the fuse box diagram or vehicle manual and are not printed on the fuse body itself.

• Power (Power Window): Controls the power window system, typically rated at 30 Amps.
• HTR SUB: Related to the air conditioning system and fuel injection (sequential or multiport), rated at 7.5 Amps.
• IG1 / BACK: Supports major electrical systems such as AC, starter, meters, and hazard lights, rated at 7.5 Amps.
• ECU IG1: Supplies power to the electric power steering, ABS, and SRS airbag systems, usually rated at 7.5 Amps.
• ECU IG2: Connected to the vehicle meter, automatic transmission, and shift lock control, rated at 10 Amps.
• DEF: Used for the rear window defogger, rated at 20 Amps.
• KD/L (Door Lock): Protects the door locking system, rated at 15 Amps.
• HAZARD: Controls turn signals and hazard lights, rated at 10 Amps.
• CIG: Used for the power outlet or cigarette lighter socket, rated at 15 Amps.
• ACC: Supports exterior mirrors, shift lock, and audio systems, rated at 10 Amps.
• ST: Used for the starter system and fuel injection, rated at 7.5 Amps.
• FR-FOG RH: Front right fog lamp, rated at 7.5 Amps.
• FR-FOG LH: Front left fog lamp, also rated at 7.5 Amps.

Car Fuse Code Meanings in the Engine Compartment

In addition to the cabin, fuses are also installed in the engine compartment to protect the vehicle’s main systems. Below are some commonly found fuse codes in the engine bay:

• H-LP RH: Controls the right headlamp, rated at 10 Amps.
• H-LP LH: Controls the left headlamp, also rated at 10 Amps.
• EFI: Connected to the fuel injection system and fuel pump, rated at 15 Amps.

Note: Fuse code configurations and amperage values may vary depending on the vehicle brand and model.

How to Check a Car Fuse

1. Turn off the engine and make sure the ignition is in the off position.
2. Locate the fuse box (usually under the dashboard or in the engine compartment).’
3. Refer to the fuse diagram on the fuse box cover to identify the correct fuse location.
4. Remove the fuse you want to inspect using a fuse puller.
5. Check the fuse condition: if the wire is broken or darkened, the fuse is blown; if the wire is intact, the fuse is still good.
6. If the fuse is blown, replace it with a fuse of the same color and amperage rating.
7. Reinstall the fuse and securely close the fuse box cover.

Understanding car fuse code meanings is important for every vehicle owner. Fuses protect the vehicle’s electrical system, so by knowing their location, codes, and functions, owners can more quickly identify potential electrical issues and prevent more serious damage to vehicle components.

In addition, understanding car fuse codes plays an important role during vehicle inspections, especially when participating in car auctions. By checking the condition of the fuses, you can gain insight into how well the vehicle’s electrical system was maintained by the previous owner.

When inspecting a car at a JBA Auction, take the time to look at the fuse box as well. A fuse box that appears neat and clean, uses fuses with the correct amperage ratings, and shows no signs of jumper wires or non-standard electrical modifications generally indicates that the electrical system has been properly maintained. On the other hand, fuses that appear burnt, damaged, or replaced with incorrect sizes may signal underlying electrical issues that should be carefully considered before you decide to place a bid on the vehicle.

If you are interested in purchasing a used car through a process that is secure, transparent, and flexible, you can participate in JBA Indonesia car auctions. For more information about our auction activities, please contact JBA WhatsApp at +62 817-0993-078 and follow all JBA social media channels for the latest updates on vehicle auctions and automotive insights.