I replaced the bulb headlight on driver side, why it not working.

My driver side headlight go out, I bought the exactly the same one. I replaced and it's not working. I don't know what wrong. Can u help me? Thank u.

My car has 110000 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. Thanks for writing in about your 2000 Lexus ES300. Sometimes the bulb is not the reason why the headlight is not working. In fact, some common causes include a bad relay, faulty electrical harness that attaches to the headlight, or a fuse issue. However, in some cases, especially with halogen headlights, touching the actual bulb with bare fingers can cause the light bulb to burn out instantly due to oil residue on the fingers. This causes an overheating situation on the bulb and can happen very quick.

Two things you should do before calling a mechanic include checking the connection from your light bulb to make sure it wasn’t installed backwards; and second, check the fuses to see if any of them are burnt. If those are good, contact one of our local mechanics to complete a headlight inspection for you and make the right repair.

How to Identify and Fix Common car Problems ?

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

The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault.
Headlight Fuse or Relay

If a headlight fuse blows, it could cause the headlights to stop working. Most headlight systems are also designed with a relay that switches the power between low beam and high beam headlights. If this relay goes bad, it could allow power to the high beams, but not the low beams.

If both of your low-beam headlights are out, but both of the high-beams work fine, it`s possible that both of your low-beam halogen headlight bulbs have simply burned out. After all, the lightbulbs in a modern halogen headlamp unit can burn out just the same as light bulbs in your home or office.
If the light does not work with a new bulb, check whether the circuit breaker or fuse governing the fixture has tripped or blown. This often happens when a bulb burns out the moment it is turned on. For safety when resetting a breaker or changing a fuse, stand on a dry surface.
It will most likely be under the hood of your vehicle where your main fuse panel is located. However, it may be located inside the cab of the vehicle if you vehicle is equipped with an interior fuse box.
A bad headlight relay is among the more common reasons we see for low beam headlights not working while the high beams do. You see, the low and high beams each have their own relay, which is essentially an electrical switch.
The most common sign of a bad headlight relay is headlights that don`t work. A headlight relay will typically fail in the open position, preventing voltage from reaching the headlights. If the low beam relay fails, the low beams won`t work.
Generally it is 30 Amps, but it depends on the wattage of bulb used in the headlamp. 30 A fuse is for halogen bulbs upto 100 watts.
Where is the Headlight relay located? You can find the Headlight relay in the electrical distribution unit of the engine block. In case you need support locating the relay, refer to your owner`s manual.
Hence, a fused bulb does not light up as no current passes through its filament. Q. An electric bulb does not glow sometimes, although it does not fuse.
An electric bulb may fuse due to a break in its filament. A break in the filament of an electric bulb means a break in the path of the current between the terminals of the electric cell. Therefore, a fused bulb does not light up as no current passes through its filament.
Bulb itself could be fused or damaged. Some connections may be loose or faulty. Electrolyte may not free charges. Battery is weak, so the current is not strong enough to light the bulb.
Connect the test light to battery power. Touch the test light probe to the socket`s ground on the connector terminal. If the test light glows, check the bulb socket and connector for corrosion or a bad contact. If the test light doesn`t glow, check the ground side of the circuit for an open.
Sometimes a faulty headlight switch or multi-function combination switch is the cause of one headlight not working. If one of the modes like high beam or low beam is not working when selected, the problem may be the switch, especially if there is no problem with the bulb, fuse, or the electrical power to the switch.
Neither of the headlights work

Bulbs usually don`t burn out together, but it`s still important to rule that out by checking for power. Most total headlight failures are caused by a bad component like a fuse, relay, or module.

A relay harness connects your HID lighting system directly to the car`s battery. This allows the lights to draw power from the battery rather than the rest of the vehicle`s system. The main benefit of installing a relay harness is that it can help to provide a regulated flow of energy to your HID headlights.
Neither of the headlights work

Bulbs usually don`t burn out together, but it`s still important to rule that out by checking for power. Most total headlight failures are caused by a bad component like a fuse, relay, or module.

When one of the bulbs is fused or disconnected, electricity stops flowing only through the faulty bulb. For other bulbs, there is still path for electricity to flow. Hence, the remaining bulbs still continue to glow.
There exists a single path for the current to flow in a series circuit thus when one bulb fuses the entire circuit breaks and none of the bulb lights up and the circuit becomes open.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

The driver side reverse light won’t work, only the passenger side light works. I’ve changed all the bulbs and I still can’t get it to come on.
ANSWER : I would suspect that that there is a problem with the socket for the light bulb. Corrosion will build up in the bulb socket and not allow power, or ground, to get to the bulb. If the bulb is okay, then there is probably a wiring issue. You will first need to determine if the bulb socket is getting power and ground. That will tell you if it is a problem with the socket, or if it is something else.

To avoid any unnecessary repairs, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the issue with your lights and fix it as necessary.

I changed the lightbulbs on my cars headlights but the driver side headlight won’t turn on…
ANSWER : Hello. Ironically, I happen to have a 2000 CLK 430 as well and I experienced an almost identical scenario as you did. I had a fog light out on my vehicle, thinking it was a bulb I went ahead and replaced the light bulb but once I replaced it it still did not fix the issue. Upon further inspection of my vehicle I found that the some of the insulation around the wiring leading to the fog light was brittle and causing wires to be exposed. I taped the wires with some electrical tape because Mercedes-Benz has a very sensitive electrical system and if a wire is exposed it will cause resistance. If the electrical system senses too much resistance it will cut power off to that component to help protect other electrical parts. I suggest to have a technician such as one from YourMechanic inspect the wiring of your fog light that is out, check the fog light fuse in the side fuse compartment, and also check the clearance light bulb. The clearance light bulb is a small bulb located under the fog light and is integrated into the fog light circuit. If the clearance light is out it will interrupt the fog lights power. On my vehicle it was a clearance light being out and the damaged wiring to the fog light causing my fog light to be inoperative. You are able to find a technician and schedule an appointment to evaluate your vehicle here https://www.yourmechanic.com/services/fog-or-driving-lights-are-not-working-inspection

Driver side door lock button not working, and passenger side sliding door makes a buzzing noise
ANSWER : Hi there. These door issues are common on this vehicle. Most of the time the main issue is the master door lock switch on the driver door. It sounds like you already replaced that. As for the sliding door problem, most of the time, this is a failure within the door module or it can be a connection issue.

I typically take the door apart and check the connections on the module and inside of the door just to make sure that there is nothing apparent in there. If the connections and the wiring are fine, then I use a scan tool to check the module to see what the inputs and outputs are doing. If you need to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your door problem and recommend a repair.

Passenger-side brake light won’t work even after replacing bulb
ANSWER : Since the problem is only on one side, you can rule out the fuse and other parts of the circuit that are shared by both bulbs. I would look closely at the connector for the nonfunctional bulb, as it may be damaged or corroded. If the bulb looks OK, you’ll want to test for power and ground at the bulb. Since the bulbs share more of the same circuit components, lack of power indicates a problem in the power side wiring. No ground would indicate a bad ground connection or a problem with the wiring on the ground side of the circuit. Electrical diagnosis can be difficult, which is why I suggest having a trained professional diagnose your brake light problem for you. The team at YourMechanic is an excellent option since we make house calls.

On the driver side of my car the low beam headlight doesn’t work. I checked all fuses and changed the bulb, but it still doesn’t work
ANSWER : Hey there. When you say you checked the fuses & the relays, and everything was getting power, did you check the actual outlet for power? You can use a voltmeter to test the available voltage at the bulb socket. You can also use an ohmmeter to test the resistance of the socket and make sure the socket itself has not failed. If this is the case, you will need to rewire a new bulb socket into place. If performing this at home, your main concern should be with making sure the new connections are protected from the environment. If you do not have the right amount of available voltage at the socket, you will want to trace from the fuses and relays to the socket every foot or so until you find where the voltage drop occurs. This is where your issue is and it must be corrected by whatever means necessary, which can only be determined once the issue was found. You may have a short or a damaged wire/connection along the way. If you would like to have this taken care of, a qualified professional, like one from YourMechanic, can come to your car’s location to diagnose the headlight problem and follow through with repairs.

Power mirror on passenger side will not retain it’s setting driver side works perfect.
ANSWER : A technician with an advanced scan tool can verify the issue. The mirror system is complex and involves many modules. The Body Control Module is a possible cause, but it’s doubtful; replacement requires reprogramming, which requires special equipment. I would check the driver’s and passenger’s door modules; toggle or move the switch on the driver’s side to see if it causes the problem, and ensure that the mirror glass itself is not loose on the passenger’s side mirror assembly.

Without diagnosing the problem with advanced equipment, the issue is hard to diagnose. A qualified YourMechanic technician can show up to the location of your vehicle with a scan tool to inspect and diagnose your power mirror issue.

My driver’s side headlight won’t turn on and a new bulb didn’t fix it
ANSWER : Your vehicle has a recall on the headlight wiring connectors and bulbs. If the connectors do not have a made in Mexico tag on them, then they will need to be replaced with new bulbs and connectors as per recall E04 dated March 2005. The recall has to be performed by a qualified dealer and should be free of charge. However, if this doesn’t solve your problem, have a certified technician check your headlight’s out. They will be able to diagnose the issue and make any necessary fixes.

driver side power lock doesnt work.
ANSWER : Thank you for writing in. There are several reasons you may be having these issues with the locks. However, without knowing what model of Chevy you are driving it is difficult to know what exact components you are working with. The best way to figure out what the issue is with electrical testing. You will want to start with the switch and see if the power is making it passed the switch when activated to actually power the door lock actuator. If the power is reaching the actuator and it is not using the power, you can assume there is an issue with the unit. This kind of testing can be done with a test light or voltmeter. The alarm issue is typically a wiring issue, and may be completely unrelated. Only further testing and inspection will tell. For more help accessing and testing the locking circuit, contact our service department to schedule an appointment.