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BMW 325i Tail Lights

Major Causes of Faulty BMW 325i Tail Lights

Your BMW 325i tail lights are very important when it comes to guaranteeing your safety on the road, but they can't do much protecting once they stop working. Defective tail lights can lead to traffic violations and accidents, so fixing them as soon as possible is a must. Here are some of the possible reasons behind your malfunctioning tail lights:

Burned-out tail light bulbs

Faulty bulbs are the most common causes of tail light failure. Your tail light bulbs normally need replacement after several years of use, but you might have to resolve other issues with your tail lights if your burned-out bulbs are relatively new. Examine your bulb sockets and make sure that they are free of rust. It would also be a good idea to check for any cracks on the lenses that might be letting moisture into your tail light assembly.

Blown fuses

Blown fuses are also a major culprit behind tail light failure. If you noticed that both of your tail lights stopped working at the same time, there's a big chance that a damaged fuse is the root of your problem. Check the fuse located behind your car's glove compartment and replace it if it's damaged.

Wiring problems

Loose wiring connections, broken wires, and corroded wires are also very common reasons behind blown tail lights. Although fixing these electrical issues in your Bimmer is best left to professionals, you can try diagnosing the wiring issue first using your car's service manual. Check the wiring diagram for your car's tail lights and see if you have some faulty or loose connections. You can also do a voltage test using a digital ohmmeter or multimeter to see if your wires are able to deliver consistent power to your tail lights.

Other troubleshooting reminders

A close inspection of faulty tail light bulbs can also give you some clues regarding the exact nature of the problem. Bulbs that fail due to old age usually have a dark metallic sheen, while bulbs that are blown due to a poor seal typically have a black, dirty appearance. If the reason for your failed bulbs are broken or stretched filaments, your tail lights were probably subjected to too much shock or vibration.

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  • Tips to Keep Your BMW 325i Tail Lights in Perfect Condition 27 February 2013

    Ensuring that you your BMW 325i tail lights are in perfect running condition is one of the best ways to avoid getting into a rear-end collision. To lengthen the lifespan of your tail lights and get them to perform at their best, here are some tips:


    Make sure that your tail light lenses are clean and clear.


    Even if your tail light bulbs are in prime condition, your tail lights can still appear dim because of dirty and scratched tail light lenses. Luckily, there are several tail light cleaning options for you, and some of them can even be done using household items. For a safer and more thorough cleaning, you can opt to have your lights serviced by a professional every couple of years, or you can get a commercial restoration kit to clean your tail light lenses. If you want a more budget-friendly approach, you can gently rub your tail light lenses with some toothpaste, baking soda paste, or aluminum polishing compound.


    Check your wires for signs of damage.


    A visual check can usually tell you if you have a loose connector or ground wire and cracks or corrosion on the wires. However, it is also advisable to regularly test your wires with a digital voltmeter or multimeter to see if they are providing enough power to your tail lights.


    Examine your tail light lenses regularly for cracks and other damage.


    Cracks, scratches, and grime on your tail light lenses are not only unsightly; they also reduce the lifespan of your tail light assembly. Scratches and dirt buildup can be easily fixed by cleaning your tail light lenses both on the inside and on the outside. Small cracks can be sealed using some clear silicone or clear plastic sealant. However, if your tail light lenses have sustained some serious cracks, you should replace them immediately to avoid corroding your bulbs and bulb sockets.


    Know the correct type of tail light bulbs for your car.


    When replacing your tail light bulbs, always remember to use the right one for your vehicle. You can tell what type of bulb you have by looking at the code that is usually printed on its base. Also make sure that your tail light's mounting bolts are securely tightened to avoid getting your tail lights damaged by excessive vibration.