Projects & Repairs --> Lights --> Headlights --> 2004 Mercedes ML320

2004 Mercedes ML320.

Replacing Headlight Bulbs On A 2004 Mercedes ML320

(Covers M-Class Model Years 1998 to 2005)

In This Article:

A small shield is removed and 3 bolts are taken out. The headlamp assembly is unplugged and removed from the car. The bulb compartments are opened and the bulbs replaced.

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Skill Level: 2-3 (Basic to Intermediate)

Time Taken: About 30 Minutes

By Jim Wilk, Licensed Auto Body Technician


The first step in changing the headlight bulb in this Mercedes was to open the hood to gain access to the head light area.

First I had to remove the shield between the headlight and bumper cover. Using a small flat screwdriver I pushed down on the release clip and pulled lightly.

Release the metal cover or splash guard around the headlight, Mercedes. 


 Metal shield around headlight, ML320.

After I released the clip I swung the shield outward towards the fender and unhinged the shield from the fender.

Here the shield has been removed completely. The green arrow points to the hinge and the red arrow points to the release clip.


Now that the two nuts attaching the headlight assembly to the body are exposed, I used a 10mm socket to removed the two nuts. Headlight mounting bolts, Mercedes ML320, M-Class. 


 Top bolt location for headlight, Mercedes M-Class. With the 10mm socket I removed the top bolt (red arrow).

Then with a flat screwdriver I pushed up the factory assembly holding clip (green arrow).


With my thumb I lifted the release clip and pulled both of the wire harnesses out. Then I was able to remove the headlamp assembly. Unplugging thehead light wire, Mercedes ML320. 


 Access to the low-beam head light, Mercedes ML 320. The green arrow points to the turn signal bulb. I turned it to the left (counter-clockwise) to remove.

Using my thumb I pressed the release lever to the low beam headlight bulb cover. The cover just swung down to expose the bulb.


View of the low beam headlight bulb wiring and retainer clip.

To remove the bulb, the wires are unplugged and the retainer clip (red arrow) is pressed and moved out of the way. Then the bulb can be pulled out.

Low beam headlight replacement, Mercedes Benz M-Class. 


High Beam Removal:

 Reaching the high-beam head light bulb on a Mercedes-Benz ML 320. To remove the high beam headlight bulb cover I turned the cover to the left (counter-clockwise).


View of high beam headlight bulb wiring and retainer clip.

To remove the high-beam bulb, the wires are unplugged and the retainer clip is released. Then the bulb can be pulled out.

Remove high beam bulb on Merc M-Class ML320. 


Note On Handling Headlight Bulbs:

Do not touch headlight bulbs with your bare hands, because the oil on your skin can ruin the light bulb. Use a paper towel or tissue to handle the new light bulb.



 Headlight assembly mounting area on Mercedes ML320. View of headlight mounting area.


The car after the headlight assembly has been put back on the car. Mercedes ML 320. 


More Info:

Tools Used:

  • Small Flat Screwdriver
  • Sockets: 10mm

Materials Used:

  • Headlight Bulbs
  • Turn Signal Bulbs

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Written January 28, 2009