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Headlight Bulb and Assembly Replacement
 
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Pelican Technical Article:

Headlight Bulb and Assembly Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$10 to $600

Talent:

**

Tools:

8mm socket, flathead screwdriver

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Bulbs or assemblies

Hot Tip:

Do not touch the bulbs with your bare hands

Performance Gain:

Working headlights

Complementary Modification:

Polish the lenses

The Mercedes C350 came with different option including lights. Our project car came with the AMG style package but not the Zenon lights. The procedures for working on the lights are very similar. Sometimes it is just the difference of a different type of bulb or wiring connection. Therefore this article should get you close even if your vehicle is optioned differently. Just make sure of the type of equipment on your car before ordering parts.

All of the bulbs in the headlight can be changed without removing the assembly from the vehicle even though it is a tight fit on the left side. I have removed the assembly to get better pictures of the procedure, as you will be doing some of this by feel. When changing bulbs be sure to never touch the bulb with your bare fingers or hands. The oils in your skin can cause a hot spot on the bulb and greatly decrease the life of the bulb.

The lenses on the headlights cannot be replaced independently. So if you damage a lens you will need to replace the whole assembly. The procedures are the same for both sides.

While you can replace every bulb in the headlight assembly that are in the vehicle, if you need to replace the assembly you will need to remove the front bumper cover.
Figure 1

While you can replace every bulb in the headlight assembly that are in the vehicle, if you need to replace the assembly you will need to remove the front bumper cover. Please see our article on front bumper cover removal for all the steps and procedures needed.

As you can see in the picture you can access all of the assembly ports while the units are still in the car (red arrow).
Figure 2

As you can see in the picture you can access all of the assembly ports while the units are still in the car (red arrow). That being said, it is a tighter fit on the left side headlight.

If you are removing the assembly begin by disconnecting the electrical connection by using a small flathead screwdriver and sliding the clip back on the connection (red arrow).
Figure 3

If you are removing the assembly begin by disconnecting the electrical connection by using a small flathead screwdriver and sliding the clip back on the connection (red arrow). Then squeeze the clip and slide the connection off.

There are three mounting/adjusting points for the headlight assembly (red arrows).
Figure 4

There are three mounting/adjusting points for the headlight assembly (red arrows).

The top mount and adjuster is removed from below.
Figure 5

The top mount and adjuster is removed from below. Use a 8mm socket and remove the bolt and large washer (red arrow).

Remove the 8mm side bolt and washer (red arrow).
Figure 6

Remove the 8mm side bolt and washer (red arrow).

This photo illustrates how the adjusters work; by turning the plastic adjuster (red arrow) you can raise and lower the angle of the beam (yellow arrows).
Figure 7

This photo illustrates how the adjusters work; by turning the plastic adjuster (red arrow) you can raise and lower the angle of the beam (yellow arrows). Once this is set you tighten down the 8mm bolt and washer.

Remove the front 9mm bolt and washer (red arrow).
Figure 8

Remove the front 9mm bolt and washer (red arrow).

You can now carefully remove the headlight unit from the vehicle.
Figure 9

You can now carefully remove the headlight unit from the vehicle. Place something soft under the unit on your work surface to prevent damaging the lens.

This photo illustrates the access ports on the rear of the assembly.
Figure 10

This photo illustrates the access ports on the rear of the assembly. If you are changing bulbs with the assembly in the vehicle this will help you figure out which port is for which bulbs: 1- Headlight, 2- High beam, 3- Turn signal, 4-Standing and parking Light, 5- Standing Light. All of the ports are plastic and just twist off the assembly.

Open the port for the headlight and remove the electrical connection from the bulb by pulling it straight off (red arrow).
Figure 11

Open the port for the headlight and remove the electrical connection from the bulb by pulling it straight off (red arrow). The bulb is held in the base by a wire clip (yellow arrow).

Move the end of the wire clip (red arrow) out from the receptacle (yellow arrow) and pivot the clip back.
Figure 12

Move the end of the wire clip (red arrow) out from the receptacle (yellow arrow) and pivot the clip back. The bulb will only fit into the receptacle in one direction. It has a small cut out in the receptacle for the bulb (green arrow). This is important when you are trying to fit a bulb in the tight confines on the left assembly with it in the car.

With the wire clip removed you can replace the bulb.
Figure 13

With the wire clip removed you can replace the bulb. Remember to be sure to never touch the bulb with your bare fingers or hands. The oils in your skin can cause a hot spot on the bulb and greatly decrease the life of the bulb.

Open the port to the high beam and pull the wiring connection off the bulb (red arrow).
Figure 14

Open the port to the high beam and pull the wiring connection off the bulb (red arrow).

The bulb will only fit into the receptacle in one direction.
Figure 15

The bulb will only fit into the receptacle in one direction. It has a small cut out in the receptacle for the bulb (yellow arrow). This is important when you are trying to fit a bulb in the tight confines on the left assembly with it in the car. The high beam bulb is held in place by three small spring clips (red arrows)

Simply pull the bulb straight back and out.
Figure 16

Simply pull the bulb straight back and out. The spring clips are not very strong. Also, be sure to never touch the bulb with your bare fingers or hands. The oils in your skin can cause a hot spot on the bulb and greatly decrease the life of the bulb.

The standing lights are located behind the two top plugs (red arrows).
Figure 17

The standing lights are located behind the two top plugs (red arrows).

These just pull straight back out of the housing and the bulbs just pull straight out of the receptacles (red arrows).
Figure 18

These just pull straight back out of the housing and the bulbs just pull straight out of the receptacles (red arrows). Remember to be sure to never touch the bulb with your bare fingers or hands. The oils in your skin can cause a hot spot on the bulb and great decrease the life of the bulb.

The turn signal bulbs and connections twist out from the assembly, while the bulb pulls straight out form the base.
Figure 19

The turn signal bulbs and connections twist out from the assembly, while the bulb pulls straight out form the base. Remember to be sure to never touch the bulb with your bare fingers or hands. The oils in your skin can cause a hot spot on the bulb and great decrease the life of the bulb. Installation is the reverse of removal.



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