Troubleshooting Mercedes Headlights

Written by daniel valladares
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Troubleshooting Mercedes Headlights
The headlights of your Mercedes-Benz are important for the safety of your vehicle. (Front-light of black mercedes image by Mladenov from Fotolia.com)

Troubleshooting the headlights on your Mercedes-Benz vehicle is fairly simple. The three issues to check with the headlights (once you've started your car to make sure the battery's working) are the electrical connectors, the bulbs and the fuses. If the connectors are loose, the bulbs are burnt out or the fuses are broken, the headlights will not function properly. You don't need to be a Mercedes mechanic to check for all three of those problems and fix them. The entire process requires no tools aside from a replacement bulb or fuse.

Skill level:
Easy

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Things you need

  • Clean cloth
  • Replacement H7 bulb
  • Replacement 15 amp auto fuse

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Instructions

  1. 1

    Park the vehicle and turn off the engine. Open the bonnet.

  2. 2

    Lightly tug on the electrical connector at the rear of the headlight assembly. If it comes out, securely plug it into the rear of the assembly.

  3. 3

    Rotate the housing cover counterclockwise and pull it off. The larger housing holds the low-beam bulb. The smaller housing holds the high-beam bulb. Rotate the bulb holder counterclockwise and remove it from the vehicle. Remove the old bulb and use a clean cloth to install the new bulb.

  4. 4

    Place the bulb holder back into the assembly and rotate it clockwise to secure. Reattach the housing cover.

  5. 5

    Remove the cover from the underhood fuse box. Locate the "HEADLAMP" fuse. If the metal piece inside the fuse is broken, it will need to be replaced. Pull the fuse out of the fuse box and replace it with a new fuse. Place the cover back onto the fuse box. Close the bonnet.

  1. 1

    Park the vehicle and turn off the engine. Turn the front wheels inward and remove the front wheel housing cover by turning the rotary catch counterclockwise and pulling the cover off.

  2. 2

    Lightly tug on the electrical connector at the rear of the assembly. If it comes out, securely plug it into the rear of the assembly.

  3. 3

    Rotate the housing cover counterclockwise and pull it off. The larger housing holds the low-beam bulb. The smaller housing holds the high-beam bulb. Rotate the bulb holder counterclockwise and remove it from the vehicle. Remove the old bulb and use a clean cloth to install the new bulb.

  4. 4

    Place the bulb holder back into the assembly and rotate it clockwise to secure. Reattach the housing cover. Reattach the front wheel housing cover.

  5. 5

    Open the bonnet. Remove the cover from the underhood fuse box. Locate the "HEADLAMP" fuse. If the metal piece inside of the fuse is broken, it will need to be replaced. Pull the fuse out of the fuse box and replace it with a new fuse. Place the cover back onto the fuse box. Close the bonnet.

  1. 1

    Park the vehicle and turn off the engine. Open the bonnet. Remove the headlamp cover in the engine compartment by removing the retaining clip and pulling the cover off.

  2. 2

    Lightly tug on the electrical connector at the rear of the assembly. If it comes out, securely plug it into the rear of the assembly.

  3. 3

    Rotate the housing cover counterclockwise and pull it off. The larger housing holds the low-beam bulb. The smaller housing holds the high-beam bulb. Rotate the bulb holder counterclockwise and remove it from the vehicle. Remove the old bulb and use a clean cloth to install the new bulb.

  4. 4

    Place the bulb holder back into the assembly and rotate it clockwise to secure. Reattach the housing cover.

  5. 5

    Remove the cover from the underhood fuse box. Locate the "HEADLAMP" fuse. If the metal piece inside of the fuse is broken, it will need to be replaced. Pull the fuse out of the fuse box and replace it with a new fuse. Place the cover back onto the fuse box. Reattach the headlamp cover and the retaining clip. Close the bonnet.

Tips and warnings

  • Never touch headlight bulbs with your bare hands. Oil on your skin can ruin the bulb. Always use the clean cloth to handle the new bulb.

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