Brake Lights Not Working When Headlights Are On


Your Jeep Grand Cherokee’s brake lights may be out or not working. Several different things can cause this. They crossed wires, burnt-out bulbs, blown fuses, or a bad connection in a circuit of the combination switch. If the headlights are not on, the brake light might not work.

Crossed Wires

The problem could be the bulb if the brake lights aren’t working. It could also be the socket that has become corroded. The brake light switch is primarily an on/off the plunger. It works in conjunction with the TBL (transformer-based lighting) system. If the brake lights are still not working, you should first check the fuse. If the fuses aren’t working, you can try swapping them with other fuses of similar amperage. The circuit may be faulty, but you can always check it with an electrical test light. The test light is inexpensive and readily available at Wal-Mart or other parts stores.

The next step is to replace the brake light switch. Depending on the make and model of your Jeep, a cross-wire could have caused your brake lights not to function. If this problem has been plaguing your Jeep Grand Cherokee for months now, it may be a sign of a bad switch. If this is the case, check the wiring harness for damage.

Another way to troubleshoot cross-wires in Jeep Grand Cherokee brake lights is to look for rust. A rusty bolt can cause the wire to touch both terminals, so checking it first is essential. Alternatively, you can substitute a jumper wire to replace a lousy brake control. You should also check for loose wires.

Checking for cross-wires in Jeep Grand Cherokee brake lights can be difficult. One way to troubleshoot the problem is to use a stick tester. Use a stick tester to check the terminals of the wiring harnesses and test the wiring. If the problem persists, you can use a wire tester to check the connections and ensure they’re not shorted.

Blown Fuses

If your brake lights don’t work when the headlights are on, one of the leading causes could be blown fuses. When you pull the fuses out, you should replace them with the same amperage fuse as the old one. If this solution does not work, you should try to find out the cause of this problem and fix it before it worsens. Besides, a blown fuse could be a sign of bad electrical ground. In such a case, you should check if you have any loose connections, damaged wire ends, or corrosion.

In addition to blown fuses, you should also check for a short in the wiring harness. If this doesn’t solve the problem, check other fuses of the same amperage. If none of the fuses is blown, check the wiring harness. You should check the fuses to see if the wiring is loose or frayed. Also, make sure the brake light switch is working correctly.

Lastly, check the bulbs. If you’ve noticed that your tail lights are not working when the headlights are on, the bulbs might have blown. Replacing them is a quick and easy fix. It’s not hard to do, and you can do it yourself with essential tools. You can also try rewiring your Jeep Grand Cherokee to ensure the brake lights are working correctly.

You can check for a blown a fuse by using a voltmeter. Alternatively, you can check if the headlight relay is the source of the problem. Check whether there’s any discoloration on its base or terminals. These symptoms could indicate a bad headlight relay. Once you’ve replaced the fuse, the problem will persist.

Read More: What Wheels Interchange With a Jeep Grand Cherokee?

Burnt Out Bulbs

You’re not alone if your Jeep Grand Cherokee has burned-out brake lights. Several factors cause this common issue. Most vehicles have electronic lighting systems, but older models still have incandescent bulbs that need replacing. It’s a relatively cheap and straightforward task you can do yourself at home. If you’re unsure how to replace the bulbs, here are some things you can do to check whether they’re burning out.

First, you need to locate the faulty bulb. If the light is under the tail light lens, you can turn a flashlight on it to see whether it’s inside the housing. Then, twist the bulb holder counterclockwise to loosen it from the socket. Be sure to apply dielectric grease to the bulb socket to keep it from fusing or corroding.

A faulty design is another cause of burned-out brake lights on a Jeep Grand Cherokee. This design causes the brake lights to stop working when the headlights are on but still work when the headlights are off. The problem is centered on the tail light assembly. There are three silver contact points on the assembly. One contact point is opposite the other two. Next to these contacts is a ground connector. Lastly, the plastic itself is depressed and slightly warped.

The first step in a fix is to check the fuses. You should check the center brake light switch if all three bulbs are burned out. Otherwise, the cause of this problem is probably the fuse in the center brake circuit. The brake light fuse is typically located under the hood or on the kick panel inside the passenger compartment. Make sure to check the fuse and replace it if necessary. If this does not solve the problem, contact a mobile mechanic for a more reliable solution.

Bad Connection In A Circuit

If the brake lights do not come on while the headlights are on, there’s a chance that the braking system’s fuse is terrible. And the brake light switch is functioning correctly. The brake light switch itself is not the problem. You can shift the brake light sensor contact towards the pedal by rotating the connector. The sensor should light when the brake pedal is pressed. The switch position can also be adjusted to make the lights come on even if the driver’s foot moves the brake pedal just a little.

Before you replace the switch, you should test it. To do this, remove the steering column covers and the sound insulator. You should then be able to access the ground lead of the switch. Once you have located this, plug in a multimeter with a 20-volt DC scale and probe both ends of the switch. Ensure the voltage reading matches the voltage displayed on the multimeter. If the voltage reading does not match, the switch may be impaired.

A bad connection in a circuit of a combination switch can also cause brake lights to stop working when the headlights are on. You can perform a series of tests to find out the cause of your Jeep Grand Cherokee brake lights not working when headlights are on. First, check the wiring harness. The brake light switch is connected to the signal switch and activated when the brake pedal is depressed.

If you cannot find the source of the problem, try replacing the fuse. A blown a fuse usually indicates a bad connection in the circuit. Secondly, check the electrical ground. A bad ground can be caused by corrosion, and loose wire ends. If you find the fault in the ground, you can permanently solve the problem.