Need to replace the HID ignitor on your Mercedes-Benz? This guide provides instructions on how to remove and change the HID ignitor on a Mercedes-Benz vehicle.


  • Mercedes HID Headlight not working
  • Left or Right Low Beam Light not on
  • Mercedes ballast doesn’t ignite.

How to replace Mercedes ballast/ignitor

Caution: HID system generates thousands of volts and can cause serious injuries. Make sure to remove the key from the ignition, turn off the headlights, and use gloves during this procedure.

What you will need

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  • Mercedes Ignitor
  • Gloves


The ballast and ignitor were mounted under the headlight on older Mercedes-Benz models. Typically this required that you either remove the headlight or loosen the front bumper to access the ballast.

On newer Mercedes models, the ignitor is mounted right on the back of the HID bulb. Use gloves when replacing the ignitor on a Mercedes-Benz vehicle.

  1. Open the hood and access the back of the headlight.replace mercedes hid ballast ignitor
  2. Remove the cap by twisting it counterclockwise.remove cap from headlight to replace mercedes hid ballast
  3. Unplug the wire from the ignitor.unplug wire from mercedes ballast ignitor
  4. Twist the ignitor counterclockwise to remove it.remove ballast mercedes ignitor headlight diy
  5. Install the new ignitor. Line up all four locking tabs, then twist them clockwise to lock in the to change mercedes ballast ignitor

How to troubleshoot Mercedes-Benz ignitor

First, you must confirm that the HID bulb is not burned out. Burned-out HID bulb is a widespread problem.

A common sign of a bad Mercedes-Benz ignitor is that one of the headlights is out. When the ignitor starts to fail, it will work randomly. If the HID bulb is burned, it will never come back or work randomly once it fails.

First, check the low beam fuse. Mercedes uses a fuse for each of the headlights. Therefore you have left and right headlight fuses.

If the fuses check out and are not burned, you need to check the ignitor.

Swap the ignitor with the other side.

  • If the headlight where you moved the ignitor does not work, the problem is the ignitor.
  • If the headlight where you moved the ignitor works, the problem is NOT the ignitor.

We hope you find the Mercedes-Benz HID Ignitor Replacement DIY guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.

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