![]() If there is no superficial damage, the mechanic will then begin to examine the different components along the electrical circuit. The mechanic will begin by examining the back of the car for any superficial damage like broken tail light covers, and loose, or frayed wiring. When checking electric components on your vehicle, especially, fuses and relays, the mechanic will bring a multimeter which will help him or her diagnose what specific component has failed. The brake light switch circuit is completed when the brake pedal is pushed, but if the switch has been pushed out of place or is not connecting properly, the brake pedal may not be able to complete the circuit, meaning that the lights will not illuminate. A vehicle with a bad relay or bad ground may not be able to successfully power your rear lights.īad Brake Light Switch: If the rear lights illuminate normally but do not become brighter when braking, the brake light switch may not be functioning properly. A wire that is not grounded properly is unable to protect the circuit and provide an outlet for excess charge that build up. ![]() A relay may also fail because it is not grounded properly. A burned out bulb will not affect the circuit of the entire rear light system, and the other rear light should continue to function normally.īad relay: A relay transfers power from the battery to the lights themselves, but when a relay fails, the connection is unable to be completed. When the filament breaks inside a bulb, it cannot illuminate the gas inside the bulb. Sometimes when a taillight lens cracks or breaks, it can allow moisture to enter the lens and cause a short circuit, blowing the fuse.īurned Out Bulbs: In the case where only one of your rear lights appears to be out, the cause is most likely a burned out bulb. When a fuse blows, it prevents the circuit from completing, in this case preventing the rear lights from illuminating. Video on how to replace the tail light bulbs.Service type Rear lights are not working InspectionĢ021 Mercedes-Benz S500 L6-3.0L Turbo HybridĢ022 Mercedes-Benz S500 L6-3.0L Turbo Hybridīlown Fuse: As a first resort, a mechanic should expect the corresponding fuse for your rear lights. Reinstall the assembly by pushing it in place and locking it using the twist tab you unlocked before.Install the new bulb by pushing it into the socket and turning it slightly to lock it into place.Twist the bad light bulb gently and pull it out.Here is a picture to identify the bad light bulb. Optional Step: Pull out the wire connector.Turn the locking plastic to a vertical position by rotating it 90 degrees.Locate the side of the tail lights with the burned / defective bulb.Tail, parking, standing (Light bulb type needed: R5W 5007 Amazon link here).Backup Lamp ( Light bulb type needed: P21W).Turn Signal Light Bulb Lamp (Type needed: PY21W See example here).Brake Light / Stop Light Bulb ( Bulb type needed: P21W).You will be able to replace the following: ![]() Video on how to replace the tail light bulbs.On this page, you will find the following: Do not use LED lamps when replacing bulbs in your Mercedes Benz you will still get a message on your dash display. Get rid of Lamps Defective Error Message on your instrument cluster. This DIY applies to:Ģ001-2007 Mercedes Benz C Class all models such as C230 C320 C240 C280 C55. Learn how to replace the tail light bulbs/lamps.
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