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Fog and Side Marker lights
 
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Pelican Technical Article:

Fog and Side Marker lights

Steve Vernon

Time:

1 hour1 hr

Tab:

$10 to $260

Talent:

**

Tools:

10mm socket, T20 Torx, trim removal tool, floor jack, jack stands, wheel chocks, safety glasses

Applicable Models:

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

Parts Required:

Bulbs or light assembly

Hot Tip:

Clean the bulb connections

Performance Gain:

Working lights

Complementary Modification:

Polish headlights

The Mercedes C350 came with different option including lights. Our project car came with the AMG style package but the procedures for working on the fog and side marker lights are very similar. Sometimes it is just the difference of a different type of bulb. 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.

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.

While it is possible to work on the lights without removing the front fender liners it only takes a few minutes and makes everything so much easier.
Figure 1

While it is possible to work on the lights without removing the front fender liners it only takes a few minutes and makes everything so much easier. Begin by removing the connection for the lower panel to fender liner (red arrow).

Next remove the three push/pull pins (red arrows) from the liner, the three 10mm nuts (yellow arrows) and the connector (green arrow).
Figure 2

Next remove the three push/pull pins (red arrows) from the liner, the three 10mm nuts (yellow arrows) and the connector (green arrow).

If you do not want to remove the front section completely release the four push/pull clips on the inside and lower edge of the liner (red arrows).
Figure 3

If you do not want to remove the front section completely release the four push/pull clips on the inside and lower edge of the liner (red arrows).

Use a trim removal tool and pry the small clip (red arrow) out from the base of the clip (yellow arrow).
Figure 4

Use a trim removal tool and pry the small clip (red arrow) out from the base of the clip (yellow arrow). Then pull the whole clip out. If you do not remove the front liner use a trim removal tool and pry the liner back out of the way.

Make life easier and remove the front section of the liner.
Figure 5

Make life easier and remove the front section of the liner.

The fog lights sit in the lower section of the bumper cover (yellow arrow) and are connected by a single wiring connection (red arrow).
Figure 6

The fog lights sit in the lower section of the bumper cover (yellow arrow) and are connected by a single wiring connection (red arrow).

Disconnect the wiring from the front fog lights (red arrow) by squeezing in the tabs on the connection and pulling it back off the housing.
Figure 7

Disconnect the wiring from the front fog lights (red arrow) by squeezing in the tabs on the connection and pulling it back off the housing.

To replace the Halogen bulb on the AMG style lights turn the bulb-housing counter clockwise in the light housing and remove it (red arrow).
Figure 8

To replace the Halogen bulb on the AMG style lights turn the bulb-housing counter clockwise in the light housing and remove it (red arrow).

The Halogen bulb pulls and wiggles straight out from the housing.
Figure 9

The Halogen bulb pulls and wiggles straight out from the housing. 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.

To remove the fog light assembly use a T20 Torx and remove the four screws (red arrows).
Figure 10

To remove the fog light assembly use a T20 Torx and remove the four screws (red arrows).

Pull the fog light assembly out from the bumper cover.
Figure 11

Pull the fog light assembly out from the bumper cover.

If you need to change the exterior trim piece gently pry up the plastic tabs from the bumper cover (red arrows).
Figure 12

If you need to change the exterior trim piece gently pry up the plastic tabs from the bumper cover (red arrows).

After installation there is an adjustment knob on the bottom of the housing for adjusting the angle of the beam (red arrow).
Figure 13

After installation there is an adjustment knob on the bottom of the housing for adjusting the angle of the beam (red arrow).

The wiring of the side markers contains the bulb holder; to remove it from the housing simply rotate the connection 45 degrees and pull it from the housing (red arrow).
Figure 14

The wiring of the side markers contains the bulb holder; to remove it from the housing simply rotate the connection 45 degrees and pull it from the housing (red arrow).

To replace the bulb simply pull it straight out.
Figure 15

To replace the bulb simply pull it straight out.

To change the housing and reflector use a T20 Torx and remove the single screw (red arrow).
Figure 16

To change the housing and reflector use a T20 Torx and remove the single screw (red arrow). Then press down on the tab on the top of the reflector (yellow arrow).

You can now carefully push and pull the reflector and housing out from the bumper cover.
Figure 17

You can now carefully push and pull the reflector and housing out from the bumper cover. Installation is the reverse of removal.

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