grand cherokee lights issues

Jeep Grand Cherokee Brake Lights Not Working when Headlights are On

The problem of Jeep Grand Cherokee brake lights not working when headlights are on is one that can happen due to a variety of reasons. If you have ever been in this situation, this article is for you. We will tell you everything you need to know. Read on.

What Causes Grand Cherokee Brake Lights Not to Work when Headlights are on?

The most likely cause of a Grand Cherokee brake light not working is a bad brake light switch. If the switch is bad, it will not send the correct voltage to the tail lights when the headlights are on which causes them not to work.

Another possibility is a short in the wiring harness that connects to the brake lights. This can be caused by corrosion in the wires or a bad connection in one of the connectors on that wiring harness. The final possibility is a blown fuse that controls that circuit.

On most vehicles, this fuse will also control other things such as license plate lights and third brake lights. The best way to diagnose this condition would be to use a voltmeter to check for voltage at the taillights.

Can a bad headlight switch cause taillights not to work?

In short, yes. The headlight switch also controls the tail lights as well as the Parking light. If the headlight switch is bad it can cause the tail lights to not work. The way a headlight switch works is that it allows power to flow through it and if that switch isn’t working then power can’t flow through it which means that no power will be sent to those lights in the vehicle.

Should tail lights be on when headlights are on?

The short answer is that, in most cases, your tail lights should be on whenever your head lights are on. They’re designed to work together, and your tail lights provide an important safety function: they alert drivers behind you of your intentions.

If you’re driving during the day, you might not need your headlights, but it’s still a good idea to have them on. In daylight conditions, the light emitted by your vehicle is less important than its presence. Turning on your headlights alerts other drivers to your presence, which means they’re less likely to collide with you.

Are Grand Cherokee brake lights supposed to come on when car is off?

Brake lights are supposed to come on anytime the brake pedal is depressed. Having them come on when the car is off is not necessarily normal, but it is not a critical issue. If your brake lights are coming on without being depressed, then there could be an issue with the switch (the part that tells the car that you are depressing the brake pedal and turns on the brake lights). This can usually be fixed by replacing or adjusting a faulty switch.

Is the tail light and brake light the same?

The brake light and the tail light are two different lights that serve different purposes. The brake lights on a car are designed to illuminate when you press down on the brake pedal. They alert drivers behind you that you’re slowing down or stopping, and they increase in intensity as your vehicle decelerates.

Taillights, on the other hand, are always illuminated when you’re driving to warn drivers behind you that your vehicle is there. However, the tail light shines much more brightly when your brake lights are illuminated. This aids drivers behind you in noticing that you’re slowing down or stopping.

What to do if the brake lights are not working when headlights are on

If the tail lights, brake lights or any other lights are not working, first check to make sure the light bulbs are not burned out. If they are, you will need to replace them. When a car’s brake lights do not work, it could be due to one of two reasons.

Either there is a problem with the wiring that connects your brake lights with your car’s electrical system or there is a problem with your brake light switch itself. If you find that your brake lights are not working, it is important to take your vehicle to a professional and have it checked out immediately.


In the end, there are ways to fix jeep grand cherokee brake lights not working when headlights are on, but they’re often going to take a little bit of effort. Stop in at your local repair shop if you’ve got one, or tackle the problem at home with the help of some internet search results.