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