What Does CTSY Fuse Mean? (Explained)

The CTSY fuse is an important fuse that needs proper attention and care. I’ve got the all best information that you need to know about the CTSY fuse of your vehicle! Read more.

In this article, I will explain what a CTSY fuse means, the dangers of having a blown-up CTSY fuse, how to prevent your CTSY from blowing up regularly, its location, etc. 

By the time you read this article to the end, you’ll be able to fully understand what the CTSY fuse means and how to manage blowing-ups.

What is CTSY Fuse and How does it work?

CTSY fuse is an acronym that means Courtesy light or done light fuse which is a fuse concerning automobile lighting. It’s a fuse responsible for the small interior light on the headliner and other lighting components of a vehicle. What controls the fuse box? The fuse box is mainly powered by the car battery.

The CTSY fuse is the fuse that houses circuits that are used for controlling car lighting and other lighting-related functions. It has different wires that can pose danger when any of them are faulty. The CTSY is the fuse that connects the wires for lighting in an automobile.

It is crucial to keep the fuse in place as it can be toxic and cause harm to the car’s electronics when it gets blown. The CTSY is a 20-ampere fuse that powers the lights in your Chevy car. The fuse is always either hot or live and it features white, orange, and brown wires. 

While the white wire signal helps ground the circuit, the orange signal indicates that the light is powered by the courtesy fuse. 

The brown wire, on the other hand, means that the beneath-the-hood light is controlled by the park lights.

How to Prevent CTSY Fuse Blowing

As I’ve mentioned earlier above, a blown CTSY fuse can cause more harm for you and your automobile. However, it is a major case as many drivers complain of their CTSY fuse constantly getting blown up. This may be the same case for your automobile.

Below are the possible ways you can do to prevent your CTSY fuse from getting constantly blown up:

  • Step 1: Replace your bulbs regularly and ensure to put them correctly. A bad bulb is prone to get blown up, so always ensure to purchase a good quality one.
  • Step 2: Ensure to use quality products all through your fuse wire connections and prevent two wires from rubbing with each other. Also, ensure that there are no loose wires and tight connections.
  • Step 3: Ensure that the circuit doesn’t get wet as that can generate sparks which will end up blowing up the entire fuse.
  • Step 4: Check for grounding: Pull the visors and check if the visor wires are not punched or grounding out. If they’re punched or grounding out, get some crimp connectors and connect them back together.

How To Fix A Blown Fuse

Below are the steps required to fix a blown fuse:

  • Step1: First, recognize where the outage happened and then turn it off.
  • Step 2: Switch off the power source to the fuse box and then figure out the blown fuse.
  • Step 3: Replace it with a new one and then test the new fuse to check if it’s working well.
  • Step 4: Trace the wires and check for any exposed wires. Test all the switches including the one that automatically turns the light on. 
  • Step 5: Employ the service of a professional car mechanic to repair it if it keeps blowing up even after trying the above methods.

What Vehicle Parts Does a Blown CTSY Fuse affect?

A blown CTSY fuse affects the lighting in your car and that will result in a lack of light in your vehicle. Lack of light is annoying and could pose even more harm than what it’s viewed as.

It can also affect the information display center (Instrument panel) of your vehicle. This will disrupt the information that is being displayed on the instrument panel. Therefore, this could lead to over-speeding, fuel issues, and even overall damage to the automobile. 

Aside from the instrument panel, another system that a blown CTSY fuse can affect is the tailgate lock and its switch. A blown CTSY fuse will cause the tailgate lock and its switch to not work efficiently. Thus, you’ll be unable to open or lift the back compartment of your automobile.

Also, the horn relay and remote control view switch could get faulty due to the CTSY being blown. Here’s a point I will make to avoid a blown fuse. Read the manual of your vehicle or CTSY fuse to know the amount of ampere to put. For a 4WD, for example, going for a 30 amp fuse will be outrageous to your vehicle.     


Why do I have a voltage drain in my CTSY circuit?

A voltage drain is likely to occur in your CTSY circuit when two wires in the circuit are rubbing against each other. Also, this can happen when a button that should be off on your circuit is left on.

What will happen when I use the wrong fuse materials for my car?

When you use the wrong or low-quality fuse products for your car, blow-ups will easily occur. Also, your entire car circuit may be damaged. Hence, I recommend you always use higher quality products for any of your automobile parts.

Final Thoughts

The CTSY fuse is one of the most important components of the vehicle lighting system. It interacts with other elements of your automobile which is why it’s dangerous when it is blown up. It’s crucial to identify whatever may be the cause of your CTSY getting blown up regularly. Also, you shouldn’t always do DIY repairs for your CTSY. Hence, I recommend that you employ a professional to repair any issues.