What causes the fault code after replacing the rear taillight on a BMW X5?

1 Answers
LucilleRose
07/30/25 3:51am
BMW X5 rear taillight fault code causes are as follows: Switch failure: Over time, switch wear, poor contact, corrosion, and aging can cause the rear taillights or headlights to not illuminate or have poor contact. Detection method: Set the multimeter to the 200V voltage range, locate the rear taillight headlight wire, and connect the two probes to the positive and negative terminals of the headlight wire. Turn on the power and switch to see if there is voltage displayed. If there is no display, the switch may be faulty. Find the headlight switch wire and use a wire or iron tweezers to short-circuit the switch wire. If it lights up, it indicates the switch is faulty. Bulb failure: Bulbs are mostly "filament-type" bulbs. Driving on uneven roads or prolonged use can easily cause the internal filament to break or fuse, resulting in no illumination. Detection method: Unscrew the rear taillight bulb and observe if the filament is broken. Rear taillights generally have two filaments, one for the headlight and one for the brake light. If one is broken, it could be the headlight or rear taillight.
Was this review help?
2
0
Share
More Forum Discussions

How to Deal with a Clogged Carbon Canister?

If the carbon canister is clogged, it is essential to promptly take the vehicle to a repair shop or a 4S store for professional cleaning. Otherwise, the car may experience issues such as abnormal noises while driving, weak acceleration, fuel line leaks, difficulty starting the engine, or abnormally high fuel consumption. Below is some relevant information about the carbon canister: 1. The carbon canister is part of the vehicle's gasoline evaporation control system, installed between the fuel tank and the engine. It has been a mandatory requirement for vehicles produced in China since 1995. The function of the carbon canister is to direct vapor into the engine cylinders for combustion and prevent it from evaporating into the atmosphere. 2. Under normal usage, the carbon canister generally does not get damaged, and no special maintenance is usually required. However, if the fuel quality is too low, it can affect the normal operation of the carbon canister. Therefore, it is advisable to use high-quality fuel when refueling. This not only ensures better performance of the carbon canister but also extends the engine's lifespan and further reduces the vehicle's fuel consumption.
7
2
Share

What Does Plug-in Hybrid Vehicle Mean?

Plug-in Hybrid Vehicle (PHV) is a new type of hybrid electric vehicle. Different from traditional hybrid vehicles that combine gasoline power and electric drive, the driving principle and drive unit of plug-in hybrid vehicles are no different from those of electric vehicles. The reason it is called a hybrid is because this type of vehicle is equipped with an engine that charges the battery. Here is some relevant information about plug-in hybrid vehicles: 1. The biggest selling point of plug-in hybrid models lies in their adaptability. First, in most regions except Beijing, they can be registered with special new energy license plates, avoiding traffic restrictions. They do not suffer from the 'range anxiety' of pure electric vehicles, and can even be used as ordinary gasoline vehicles without any major issues, making them clearly more advantageous than electric vehicles for long-distance travel. 2. Currently, there are more and more new models on the market that offer plug-in hybrid versions alongside conventional gasoline versions, providing a much wider range of purchasing options for PHVs compared to pure electric vehicles.
3
3
Share

Can I directly add water when the windshield washer fluid runs out?

You can add water when the windshield washer fluid runs out, but it is best to use windshield washer fluid. Adding water can easily cause scale buildup, leading to nozzle clogging. Here is some relevant information about windshield washer fluid: 1. High-quality windshield washer fluid is made from deionized water and various environmentally friendly additives, with functions such as cleaning, antifreeze, antistatic, and anti-corrosion. Some better-quality windshield washer fluids also have features like rapid snow and ice melting, anti-glare, and anti-fogging, which play a significant role in improving driving safety. 2. Inferior windshield washer fluids are mostly made by mixing water and alcohol, which not only damages the gloss of the car's paint and the hardness of rubber strips but can also cause color differences, swelling, and dissolution in rubber or other plastic parts. After cleaning the windshield, the washer fluid flows near the air conditioning intake, and the volatile odor of the fluid can enter the car's interior through the ventilation ducts. The harmful gases emitted by inferior windshield washer fluids can become invisible killers that endanger the health of car owners.
11
5
Share

Will the car drip water on the ground when the air conditioner is turned on?

When the car air conditioner is turned on, water droplets may drip down. Relevant information is as follows: 1. It is normal for a car air conditioner to drip water. The principle of a car air conditioner is the same as that of a household one. The low-pressure vapor of the refrigerant in the cooling system is sucked in by the compressor and compressed into high-pressure vapor, which is then discharged to the condenser. The water is the condensation formed on the condenser during normal operation, and when it accumulates, it slowly drips down. 2. Sometimes, the compressor installed in the engine compartment may also condense moisture from the air, causing it to drip onto the ground. If the low-pressure pipeline is not wrapped with insulation foam, the surface of the pipeline can easily condense moisture from the air, and water droplets often gather and drip from the lowest point of the pipeline. 3. If the air conditioner is too cold, moisture in the air may condense on the outside of the air vents, creating a phenomenon of white smoke. Moisture in the air may also condense on the plastic casing of the evaporator or the surface of the plastic pipeline that delivers cold air, resulting in dripping water.
10
0
Share

What to do when there is fog inside the rear tail light due to water ingress?

Usually, the so-called water ingress and fogging occur during normal use when the tail light accumulates water or develops fog inside due to poor sealing. When fog appears inside the tail light, it typically takes about 1-1.5 hours for the fog to completely dissipate when the light is on. If the light is off, the fog inside the tail light will only disperse after parking in a dry environment with humidity below 50% for more than a day. Solutions are as follows: 1. Remove the dust cover of the tail light to allow the water vapor inside to escape quickly, though the process is relatively slow. 2. Turn on the tail light for 30 minutes to raise the internal temperature of the tail light, accelerating the evaporation of small water droplets inside. 3. Use an air gun to blow air into the tail light, promoting air circulation inside, which can speed up defogging and dehumidification. The air gun must undergo water removal treatment.
19
1
Share

What does variable gear ratio steering in cars mean?

Variable gear ratio steering system refers to adjusting the steering ratio of the car's steering mechanism based on the vehicle's speed and steering angle. Below is relevant information: 1. When the car is driving at low speeds or with large steering angles, it provides a smaller steering ratio. When the car is driving at high speeds or with small steering angles, it provides a larger steering ratio to enhance the stability of the vehicle body. 2. Currently, there are mainly two types of variable gear ratio steering systems. One relies on a special rack to achieve the effect, with relatively simple working principles and lower production costs. The other method is more complex, utilizing planetary gear structures and electronic systems, resulting in higher production costs. Structurally, they can be divided into mechanical variable steering ratio systems and electronic variable steering ratio systems. 3. The naming of variable gear ratio steering systems varies among different car brands. For example, BMW calls it the AFS active steering system, Audi refers to it as the dynamic steering system, Toyota and Lexus name it the variable gear ratio steering system, and Mercedes-Benz calls it the direct steering system. Although their functions are similar, the production technologies used by each car manufacturer differ, with higher-end car brands generally having better-developed steering systems.
16
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.