Rear Brake light and turn signal not working on driver side

2011 F-150 Platinum. The rear brake light and turn signal is not working on the driver side. I have replaced the bulbs and the connectors but to no avail. I checked the fuses and they are fine as well. When I take my electronic key and unlock the truck the driver rear lights will not light up but when I lock the doors it does light up in the back. Need Help…. Never have seen this before.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Lighting problems like this can seem very confusing, so it is best to start with the basics. Check for power and ground at the turn and brake light sockets. I suspect in your case you will have a good ground but you won’t have any power. If you discover there is a bad ground, this will be the simplest repair. The power side of these lamp circuit is from the BCM. (body control module) So if you don’t have power at the sockets, you will need to locate the BCM and check for power coming out of the BCM.

Before you do that, you will need to connect a scanner that can communicate with the BCM. Believe it or not, you could have a BCM code that is stopping your brake and turn signal lights from working. Most people don’t have access to a scanner that can access the BCM, so you will most likely need to book an appointment with us to do this. If there are no codes in the BCM, it is most likely the BCM that needs to be replaced. Before I went and replaced it, I would check all the power and grounds at the BCM.

BCM’s are common failure items on Fords, so it is likely the problem. But you will want to do due diligence and communicate with the BCM. I recommend the following inspection to help you out. Electrical components are not working

Be sure to send the technician a note about your exact issue so he or she can come best prepared for your repair.

Good luck!

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Check Your Fuses

The first thing to check is whether or not the brake light fuse has blown. This fuse is usually located in the fuse box under the hood, and it`s relatively easy to check. Just remove the fuse and hold it up to a light – if the wire inside is broken, then you`ll need to replace the fuse.

Failing Sensor

If a sensor fails, it can interrupt this complex design and cause a part to stop functioning properly. If both the headlights and parking lights fail along with the tail lights but the brake lights keep working, a sensor is likely to blame.

Likewise, the brake light circuit is also connected to the turn signal circuit. This means that the brake light will not come on if the turn signal switch is damaged. Your mechanic will locate the wire connecting the turn signal switch and brake light switch.
In many newer cars there is one light bulb per tail light. There are two filaments in each light bulb. One is for your brake light and one is for your turn signal.
Under normal op- eration, the brake signal will override the turn signal.
If one or more of your brake lights aren`t working properly, it could mean one of three things: The brake light system fuse is blown, the brake light bulbs are burned out or the brake light wiring switch is broken. All these issues are easy to troubleshoot.
It is a 15amp fuse that powers the stop light switch on the brake pedal. The brake light switch sends power to rear brake lights.
A turn signal relay (also known as a flasher relay) is the electronic device that controls your car`s turn signal lights. The clicking sound when you activate your turn signals usually comes from the turn signal relay.
Tail lights are engaged when the you turn on your headlights or when your parking brake is on, whereas the brake lights will light up immediately when you apply pressure to the brakes. On most vehicles, the tail lights are red and the brake lights are a more luminous red.
A third brake light provides an extra signal to distracted drivers—and studies confirm that it reduces automobile accidents.
Brake lights

It may seem obvious but these are essential for letting drivers behind you know when you`re braking. By law you need to have two working brake lights. However, because they`re positioned on the back of your car it`s not unusual for you to go for a few days, without noticing that one of your bulbs has gone.

On self-propelled vehicles, no, they are separate light sources, with a possible exception for ancient vehicles. One can tell that they are separate, because turn signal lights are orange, front and back, while brake lights and rear marker lights are red.
Like all fuses, the brake light system fuse can be found in the power distribution center, which is under the dashboard or tucked away underneath the hood.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Okay so when I turn my lights on at night my brake lights do not work, when I don’t have my lights on they work fine.
ANSWER : Hi there. Based on your inquiry, it’s highly probable that you have a damaged light switch or some electrical fault inside the turn signal relay. However, it’s also possible that the brake switch above the brake pedal could also be the source of your problem. Due to the fact that multiple electrical components might be causing this issue, it’s a smart idea to first have a professional mobile mechanic complete a brake lights are not working inspection, so they can determine what’s causing all of these issues and recommend the right repairs.

Rear Brake light and turn signal not working on driver side
ANSWER : Lighting problems like this can seem very confusing, so it is best to start with the basics. Check for power and ground at the turn and brake light sockets. I suspect in your case you will have a good ground but you won’t have any power. If you discover there is a bad ground, this will be the simplest repair. The power side of these lamp circuit is from the BCM. (body control module) So if you don’t have power at the sockets, you will need to locate the BCM and check for power coming out of the BCM.

Before you do that, you will need to connect a scanner that can communicate with the BCM. Believe it or not, you could have a BCM code that is stopping your brake and turn signal lights from working. Most people don’t have access to a scanner that can access the BCM, so you will most likely need to book an appointment with us to do this. If there are no codes in the BCM, it is most likely the BCM that needs to be replaced. Before I went and replaced it, I would check all the power and grounds at the BCM.

BCM’s are common failure items on Fords, so it is likely the problem. But you will want to do due diligence and communicate with the BCM. I recommend the following inspection to help you out. Electrical components are not working

Be sure to send the technician a note about your exact issue so he or she can come best prepared for your repair.

Good luck!

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

Brake lights are not working. replaced brake light swtch still no brake lights. the third brake light the connection was melted at
ANSWER : The first thing to do is to repair third brake light and replace the brake light fuse and then see if the third brake lights work and the lower lights start working? If only the 3rd brake light starts working then you may need a further checks on the turn signal flasher or switch could be bad.

Passenger side brake light is not working – 1971 Volkswagen Super Beetle
ANSWER : It may just be chance that the other light quit working as well. Replace ALL of the brake light bulbs at the same time with the right bulbs and if they still do not work, suspect a problem in the circuit. Have a trained professional inspect the vehicle’s brake lighting circuit for any faults like a blown fuses or a malfunctioning switch. A certified technician from YourMechanic can come to your car’s location to inspect the brake lights and perform appropriate repairs.

When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

My front flashers turn signals and brake lights dont work. I have replaced the bulbs and checked the fuses. What could cause these
ANSWER : The different lights all go through the turn signal light turn switch. If the brake light switch is not working at all then the third brake light would not work. You will need to replace turn signal switch and check brake light switch also and replace it if no third brake light is working.

No dash lights, back right tail light is out, no parking lights. Brake lights work though as does head lights.
ANSWER : Hi there. In many cases, when you have electrical problems like you’re describing, it’s caused by multiple electrical component failure. It’s likely that a few electrical relays are not working; especially if you have systems that utilize the same components (such as your brake light and tail lights). I would recommend having a professional mobile mechanic come to your location to complete an electrical problems inspection first, so they can pinpoint what is damaged and recommend the right repairs.