You can also receive our Detailed Auto Topics, delivered to your computer, as soon as they are written, please subscribe to our RSS feed. But sometimes there are occasions where one of them works and the other doesn’t. Check if you have ground to the light bulb. Check any grounds the harness has in there. Then to rectify the problem, you would have to pay more for the parts. The basic procedure is to start at one end of the circuit and check for voltage and ground. However, they charge money for their services. Unplug the brake-light switch and if the lights stay on, a short circuit is the case. Also been driving drifting for the last 6 years. All of the bulbs are good. The point of the tool probe should only touch the contact, when checking. In rare cases, there might also be a broken wire somewhere. So replaced the bulb and still not working. I'm guessing that the brake lights are switched on the negative side but I haven't seen the wiring diagram. Try the emergency-flashers and if the lamp still does not light, bulbs or sockets are the very likely cause. The final possibility is a wire shorted to power. The wires appeared to be ok and no water leakage in the cab. Either one light shines more than the other or the taillights completely switch off when you press the brakes. Ok so I went for an inspection sticker and they told me my third brake light was out. Now back up, sugnal, and tsil lights works, but NO Brake Lights. With a bad turn-signal switch, the third-light should still function. Over time, moisture from rain and snow seeps into small places where the wiring and the fuse box is located. A mechanic, on the other hand, is qualified to do such jobs. One for the top/center stop lamp and another for the rear left and right brake lights. If you don’t – there might be a broken fuse or a broken wire. Here are two links. I bought new light coverings and they work just fine. There is often one below the dashboard and there is one under the hood. On this type system, the turn signals and brakes use the same circuit. I couldn’t get my brake lights to work even though my tail lights and Signal lights. If you want to find a fast troubleshooting guide, click here. When we release the brake pedal, it returns to the up-position. Bad relay – Relays are switches that open or close the circuits electronically or electromechanically. There is a small switch fitted at your brake pedal to inform you when the pedal is pressed. The brake lights quit working on my 2000 Chevy Impala. Pressing the pedal should cause the switch to move. If the contacts stick, the switch may continue supplying power to the lights, though it is released. I attached the wiring diagram so you can see what I’m talking about. If the ground is good, the socket should be replaced. What happened? If you have 12 volts to the brake pedal switch – check if you get 12 volts out when you are pressing the switch. The problem is that you cannot often tell if your taillights and brake lights are faulty. I've seen this switch knocked out of place before or even broken. Using the wiring diagram, we can determine which leads should have continuity and when. If it did not, the lights would stay on and not flash. If no 12 on blue wire oh boy. There is no light on the dash telling me so, and besides I find it hard to believe all 3 went out at once. A broken wire to or from the switch may also cause the lower brake-lights not to work. If you do not get voltage on any of the wires to the brake light switch, there is a power supply problem; either a broken fuse or wire. There are good videos on YouTube of how to do this. A wiring diagram and ohmmeter are needed. The two corner stop lights at the back are NOT the same as the two tail lights. Any recommendations to possibly fix the problem? We can also use an ohmmeter to check for continuity between the black lead and body ground. If all lights come on, when the emergency flashers are turned on, this shows the bulbs, wires and sockets are good. We are owned and operated by, Why Your Brake Lights Are Not Working, But the Tail Lights Are, Reasons Why Your Brake Lights Are Not Working, Car Dashboard Warning Lights & Symbols - Meanings, 5 Reasons Why Your Radiator Fan Is Not Coming On, Why You Should Replace Your Cabin Air Filter In Time, How to Change Brake Pads With an Electric Parking Brake. They are in place so other drivers can spot you from behind and so that they can brake at a safe distance from you if you stop. A voltage present between the wires and a ground means continuity on the ground wire should be checked. 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. Jim, common problem. Honda, Toyota and many other vehicles use these rubber pads and have this problem. If you have the “third” or dedicated brake light (the one not in your tail lights), check the harness after they diverge. Before replacing a switch check to see if it can be tested. The emergency flashers often use the same wiring, bulbs and sockets as the brakes. One of the more common is a bad brake-light switch. Mechanics also have the proper equipment to test and solve your brake light issue. In general, an electrician or mechanic would charge you $100 or more just for identifying the issue. Identify the correct fuse and replace it with a similar one. Since there are a lot of reasons for the brake light to fail while the taillight is working, it is difficult to decide which is the source problem. I have checked the connections and they seem ok. Finding such a shorted-circuit, is best left to a professional. More voltage shows high resistance in the ground circuit. It is possible that rodents have nibbled away at the wiring inside your car or that the wiring has deteriorated over time. Home » General » Why Your Brake Lights Are Not Working, But the Tail Lights Are, In General by Magnus SellénUpdated: October 2, 20207 Comments. I have no idea what is causing this problem. 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. Jeep Liberty 2006 Ltd. Rear brake lights are not working. I have been working with cars since I was 16 and I’m specialized with in-depth Automotive diagnostics. have a 98 dodge 12 valve i switched 3rd brake light to led. To test an analog brake-light switch for staying on, remove the switch and test for continuity between the terminals. We will find out below that there are a few reasons that this can happen. The third brake light does not flash with turn signals. If that is the case then there is some other problem haunting you. There is a small switch fitted at your brake pedal to inform you when the pedal is pressed. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. If continuity is indicated when released, or open-circuit shows when depressed, replace the switch. If not, then you have no other choice but to visit a mechanic or an electrician. If you got 12 volts out from the brake pedal switch but no voltage to the tail lights – there is a broken wire or corrosion between the brake pedal switch and the taillights. Please read, "Tips on  Automotive Electrical Testing," for more information. Anyways, spending some money here is better than paying a hefty fine in the future. This is a strange problem since essentially the connections for both lights come from the same source. If it too is not working, the brake-light switch, a bad fuse or an unplugged harness is likely. Check for continuity with an ohmmeter, between the ground wire and a known good ground. Goes through a plug then to the led third light. I replaced the #27 fuse which is 15 amps, I also bought new 2057 Bulbs. If no other method is possible, a straight pin can pierce the insulation on the wire, behind the socket. Be sure to repair any damage to insulation, caused by testing. Sometimes, the same bulb is used for the taillight and the brake light. All electronic equipment in a car is supplied electricity through wires that go through a fuse box. A quick test is to try the emergency-flashers, on vehicles that use the brake lights as flashers. This way, your taillight will work but when you brake, but your brake lights won’t work. Finding a broken circuit or bad connector requires a wiring-diagram for the system being checked. The third brake light works, located at the top above the rear glass. The tail lights work on the top but the bottom tail lights does not work. Check if you have 12 volts to the brake pedal switch. Only thing is, the corner brake lights will some times work and some times not. Many modern third-brake lights use an LED and do not have bulbs that can be replaced. In some vehicles, the brake light switch is powered through a single circuit that also includes the turn signal light. When they do, this guide can help find the problem. Assuming you have already replaced the bulbs, there is a switch that the brake pedal touches when depressed that activates the lights. Replaced bulbs and still not working. Try our new Category View for Detailed topics segregated by their topic. 1 Comment; Flag; More. Pushing the probe into a light socket will spread the contacts and cause the socket to fail. Check a wiring diagram to identify which wires to follow and measure at. For tougher problems give AGCO a call. You might have sparse knowledge of electronics and rather than solving the problem, you could elevate it. So if one of the three stop lights works when the pedal is depressed, the switch is working. When the brake lights will not come on, the first thing to check is the third-brake light. Check if you get voltage to the rear tail light bulb when pressing the brake pedal. A lack of power or ground shows the first half holds the problem. No Voltage at third Brake Light when brake Pressed. Parking lights and signals are working fine. Thank You! There are good videos on YouTube of how to do this. Unplug that plug with the blue wire and check for 12 volts when brake pushed there. Hello I’m Magnus, the owner and the writer of this website. We specialize in electrical diagnosis, minor or major. Other things use that ground when the key is on so its not strong enough then to activate the armature within the relay. Clicking this will make more experts see the question and we will remind you when it gets answered. Mechanicbase is a blog created for all car and automotive lovers. Find the wire that connects the brake light and the turn signal switch and replace it. I bypassed stop light switch and have replaced turn signal switch. You can also win a free AGCO coffee cup, by reporting any errors you find, with this form. Yes Checked Bulbs, The two Lower back Lights Work. Inspect the bulb filament and replace any found bad. 2006 chevy truck, 4.8L 2wd Some of these had two fuses for brake lights. Check all the connections and make sure everything has been tied together properly. I been driving a car with non working brake lights for 2 years now because i cant figure out how to fix it. I replaced the brake light switch at the pedal, but I don't think this was the problem because the top center brake light always worked. 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. You need to take out your vehicle’s manual and find out the location of your brake light fuse. (In rare situations, some cars use ground through the brake pedal switch, and this makes this more complex). Most brake light problems are fairly simple to find. When the lower lights do not come on and only the third-brake light works, the brake-light switch may be ruled out. In rare instances, the brake booster may fail, and the pedal will not rise enough to contact the switch. Nothing seems to work. The 3rd Brake light is working fine therefore I spliced the power feed from this working light to the left rear brake light. When we use the turn signal switch, it cancels the brake light signal, on the side selected. These are sometimes used by the cruise control, transmission and other systems. Step 3 These are far more difficult and may require professional service. The first, the guy shows the location and basic overview of the brake … A blown or fused bulb is the most basic reason behind a faulty brake light. You know that it has power before this point since the third brake light is still getting power. Now when you press the brake pedal the brake light works any ideas Some vehicles may have multiple switches on the brake pedal, and some switches may have more than one set of contacts. Look in the trunk (if applicable). Be certain to seal any area check in this manner as the damaged wire may cause future problems. With only two terminals, continuity should show in one position and an open circuit in the other. The CHMSL is on a dedicated circuit going through the brake switch so that if as in your case the two brake lights dont work you still have a brake light. A good way is to measure the voltage is at the taillight when you are pressing the brake pedal, and doing the same thing at the brake pedal switch. Now it's even easier to find the information you need. If electrical current is reaching the switch but the lights are not working, even if the switch is in good condition, follow the current flow with your test light to the stop lamps and look for a possible open or short in the circuit. 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. The top light still works, but the bottom 2 do not work at all. Check a wiring diagram to find out. Both brake lights works except for the 3rd light. What could be … I have Honda odyssey 2011. Did you figure out the problem? If the flashers work, check for blown fuses as a few vehicles use separate circuits for the lower and third brake lights. I have an 07 Jeep patriot doing the same thing. Purchased new covers (not Ford OEM, made in Taiwan) and Slyvana LED bulbs. Many vehicles have small plastic pads, where the switch contacts the pedal, when released. 2001 Chevy Impala rear brake lights are not working. Again try the emergency-flashers to check for wiring, socket and lamp problems. If you see that the third brake light is the only one not working, try your emergency flashers. How often should you change your brake pads? Taillights are necessary for nighttime driving. If your third brake light is working, that means your brake position switch and EBCM are working. Therefore, it is necessary for both your taillights and brake lights to work. If the bulb used in the brake light has gone faulty, it will not work when you depress the brakes. With the brakes still applied, less than 0.1 volts should show on the black wire, when checked to the body ground. I noticed this morning that none of my 3 brake lights are working. 1984 Ford F250. If not – you have a broken brake pedal switch. If you need to you can login here or register here. I checked the fuses M1 and M18 or whatever had CHMSL on the fuse box cover. These must normally be replaced as an assembly and are not serviceable. 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