If the truck your working on uses the turn signal filament in the same bulb as the brake light check from the turn signal switch as the brake light circuit goes through the signal switch. Mechanicbase is a blog created for all car and automotive lovers. There is no light on the dash telling me so, and besides I find it hard to believe all 3 went out at once. The wires appeared to be ok and no water leakage in the cab. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. If you need to you can login here or register here. If the switch does not show continuity when pressed, replace the switch. Did you figure out the problem? The tail lights work on the top but the bottom tail lights does not work. Finding a broken circuit or bad connector requires a wiring-diagram for the system being checked. Full system voltage between the black wire and system ground suggest missing or broken ground. Power and ground here, means the problem is in the second half of the circuit. If you have both ground and voltage – your bulb is broken or there is corrosion. All of the bulbs are good. I have Honda odyssey 2011. When i step on the Brake, The third light goes on but, the sides do not light up. 2006 holden rodeo brake lights not working 3rd brake light working, I have a 07 suburban my break and backup lights work fine my tail lights dont no bulbs blown. Clicking this will make more experts see the question and we will remind you when it gets answered. A blown or fused bulb is the most basic reason behind a faulty brake light. Third Brake light not working I have a 2013 JKU, and for about 3 weeks I have been driving around without my third brake light (partly because I was not aware). Sometimes, the same bulb is used for the taillight and the brake light. The brake lights and taillights are often comprised of one light bulb, but they work differently. Both brake lights works except for the 3rd light. I checked the bulbs and fuses and they are ok. All other lights work. A bad turn-signal switch may interrupt the brake light circuit when it should not. Check a wiring diagram to find out. Also been driving drifting for the last 6 years. Undo the cover using a set of screwdrivers and remove the bulb by pressing and turning, then check to see if it has blown out. If 12 there to ground check the light ground point which is white wire with black stripe screws to hatch door frame right above license plate. The basic procedure is to start at one end of the circuit and check for voltage and ground. Therefore, it is necessary for both your taillights and brake lights to work. There is often one below the dashboard and there is one under the hood. Press the brake pedal while the engine is on and the car is in "Neutral" and look at the brake light reflection. Over time, moisture from rain and snow seeps into small places where the wiring and the fuse box is located. Again try the emergency-flashers to check for wiring, socket and lamp problems. With only two terminals, continuity should show in one position and an open circuit in the other. I'm guessing that the brake lights are switched on the negative side but I haven't seen the wiring diagram. (In rare situations, some cars use ground through the brake pedal switch, and this makes this more complex). Inspect sockets closely for signs of discoloration, distortion or corrosion on the contacts. If not – you have a broken brake pedal switch. Before replacing a switch check to see if it can be tested. In some vehicles, the brake light switch is powered through a single circuit that also includes the turn signal light. In rare cases, there might also be a broken wire somewhere. I do have the 3rd brake lights. I have an 07 Jeep patriot doing the same thing. There are good videos on YouTube of how to do this. If they do, the ground should be good. If the ground is good, the socket should be replaced. Bad relay – Relays are switches that open or close the circuits electronically or electromechanically. There are good videos on YouTube of how to do this. I bypassed stop light switch and have replaced turn signal switch. When your brake lights don't work, it is usually because of a blown fuse, a worn-out or broken brake light switch, or a burned-out light bulb. With parking lights on they light up too, but with brake pushed in they completed go out. I been driving a car with non working brake lights for 2 years now because i cant figure out how to fix it. So if one of the three stop lights works when the pedal is depressed, the switch is working. If no 12 on blue wire oh boy. When the lower lights do not come on and only the third-brake light works, the brake-light switch may be ruled out. The owner's manual or service data will show fuse box location. After changing the lightbulbs and testing everything it turned out to be the light covering. The first, the guy shows the location and basic overview of the brake … I tried checking the fuse under the hood and on side of the door. Driving during the night without brake lights or tail lights can thus be extremely dangerous. Nothing seems to work. If only the third light is out and the lowers still work, see if it will flash with the emergency-flashers. If it does not operate with the flashers, bad bulbs or sockets in the third-light are likely. Unplug that plug with the blue wire and check for 12 volts when brake pushed there. Be certain to seal any area check in this manner as the damaged wire may cause future problems. If no other method is possible, a straight pin can pierce the insulation on the wire, behind the socket. We can also use an ohmmeter to check for continuity between the black lead and body ground. I bought new light coverings and they work just fine. All electronic equipment in a car is supplied electricity through wires that go through a fuse box. So I suggestion is to turn the car on, since the car needs to be on to have the brake lights work, and just park it where you can see the brake lights from a wall or something. Many modern third-brake lights use an LED and do not have bulbs that can be replaced. If it does not, a problem exists with this circuit. Usually one said "stop" and the other said "brake" and one was in the … When should you replace your brake rotors? What could be … In rare instances, the brake booster may fail, and the pedal will not rise enough to contact the switch. SOURCE: Brake light dont work. This can be a real struggle to find since the wiring from inside the brake light system might go from the front of the car to the rear. The third brake light works, located at the top above the rear glass. The procedure is repeated, dividing the circuit in half, until the problem is found. It'll tell you the connector at the BCM and the wire color or pin number. Many things can and do go wrong. Look in the trunk (if applicable). Otherwise if everything else you’re telling me is exactly how it is, then you’re looking at bad light sockets or bulbs or connector somewhere or wiring. Check all the connections and make sure everything has been tied together properly. Yes Checked Bulbs, The two Lower back Lights Work. Here are two links. Identify the correct fuse and replace it with a similar one. The brake lights quit working on my 2000 Chevy Impala. 2006 chevy truck, 4.8L 2wd Some of these had two fuses for brake lights. But sometimes there are occasions where one of them works and the other doesn’t. Check for a blown fuse and be careful, as many vehicles have more than one fuse box. The final possibility is a wire shorted to power. If it is not working with the flashers, then you may have a bad light or socket. In the illustration above, assume the red wire is the power lead for the brake lights and that the black wire is the ground for the circuit. Many vehicles have small plastic pads, where the switch contacts the pedal, when released. I need the Diagram that shows the Connector Locations on the Truck. On this type system, the turn signals and brakes use the same circuit. In this position, the brake light switch changes to an open-circuit. You can check and solve this problem by opening your car’s trunk and removing the taillights’ back cover. I have checked the connections and they seem ok. With the brakes depressed, lightly touch the terminals with a voltmeter, to check for voltage. If the contacts stick, the switch may continue supplying power to the lights, though it is released. If you question that at all, confirm the back up lights work. When we release the brake pedal, it returns to the up-position. I have been working with cars since I was 16 and I’m specialized with in-depth Automotive diagnostics. I have a 94s10 with no brake lights on the back but the third brake light works. The Electrical Ground. 1984 Ford F250. Parking lights and signals are working fine. Find the wire that connects the brake light and the turn signal switch and replace it. Jeep Liberty 2006 Ltd. Rear brake lights are not working. I have checked the fuse in the coin tray and it looks ok to me. A quick test is to try the emergency-flashers, on vehicles that use the brake lights as flashers. Ok so I went for an inspection sticker and they told me my third brake light was out. Service data for the vehicle in question will normally identify the type. If the flashers work, check for blown fuses as a few vehicles use separate circuits for the lower and third brake lights. Assuming you have already replaced the bulbs, there is a switch that the brake pedal touches when depressed that activates the lights. 2002 Chevy Blazer, rear brake lights do not work but the third light above the window does. The emergency flashers often use the same wiring, … If you see one or two of the brake lights illuminate, you can deduce that the issue is with the bulb on the failed brake light. In general, an electrician or mechanic would charge you $100 or more just for identifying the issue. If you look at pic 2 it shows that ground for both sides and a different one for the third brake light. No matter what your problem, there is a reason for it and there is a solution. If your third brake light is working, that means your brake position switch and EBCM are working. How often should you change your brake pads? Want Answer 0. Hello I’m Magnus, the owner and the writer of this website. You can test the brake light switch with a multimeter to make sure the pins get connection/0 ohm when you are pressing or releasing the switch. Good fuses mean the most likely cause is the brake-light switch. Only thing is, the corner brake lights will some times work and some times not. If the bulb used in the brake light has gone faulty, it will not work when you depress the brakes. have a 98 dodge 12 valve i switched 3rd brake light to led. One of the more common is a bad brake-light switch. Substitute a known good bulb, from the other side, to verify bulbs that cannot be confirmed otherwise. A volt ohm meter or a LED test light will be needed for some tests. So replaced the bulb and still not working. If not, then you have no other choice but to visit a mechanic or an electrician. On vehicles that use the same lights for brakes and turn signals, a bad turn-signal switch can cause the lower brake-lights not to work. With the brakes still applied, less than 0.1 volts should show on the black wire, when checked to the body ground. A bad brake switch is a really common problem when your brake lights are not working. Check for continuity with an ohmmeter, between the ground wire and a known good ground. Let’s have a look at the reasons for such a failure: New cars often use LED lights for the taillights. Test the switch, as described above, except there should be continuity when the switch activated. Analog switches are very straight forward. We specialize in electrical diagnosis, minor or major. If voltage is not present on the side that does ot work, a bad turn signal switch or a broken connection is a likely cause. If it did not, the lights would stay on and not flash. I attached the wiring diagram so you can see what I’m talking about. A voltage present between the wires and a ground means continuity on the ground wire should be checked. Then to rectify the problem, you would have to pay more for the parts. Goes through a plug then to the led third light. Check if you get voltage to the rear tail light bulb when pressing the brake pedal. It's primarily a problem with the turn signal switch since the hazards and stop lights both are on the same circuit. Be sure to repair any damage to insulation, caused by testing. Using the wiring diagram, we can determine which leads should have continuity and when. Only a few things normally account for brake lights staying on. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. Try the emergency-flashers and if the lamp still does not light, bulbs or sockets are the very likely cause. A blue wire connects the brake lights switch to the rear lamps junction block. It looks like if that fuse isburned out, that would still let the third brake light work. Pressing the pedal should cause the switch to move. 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