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Ignition Switch Replacement
 
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Pelican Technical Article:

Ignition Switch Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$370

Talent:

**

Tools:

2 flathead screwdriver drivers

Applicable Models:

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

Parts Required:

Ignition switch

Hot Tip:

Be sure to disconnect the battery and wait 30 minutes

Performance Gain:

Car starts

Complementary Modification:

Replace steering wheel with upgraded model

The ignition switch on your Mercedes is coded to the vehicle, so you will have to reprogram the system for the computer to recognize it. The switch itself is easy to remove but you must first remove the steering wheel, steering column tube module and the trim around the gauge cluster. Please see our articles on these procedures for additional assistance. Remember before removing the airbag and steering wheel to disconnect the ground cable and wait 30 minutes for the electricity to dissipate from the system.

PLEASE NOTE: MBZ no longer sells these parts. They are considered Theft Relevant Parts (TRP). You must now buy them through the service dept where installation and programming is required by MBZ only.

The switch itself is easy to remove but you must first remove the steering wheel (red arrow), steering column tube module (yellow arrow) and the trim around the gauge cluster (green arrow).
Figure 1

The switch itself is easy to remove but you must first remove the steering wheel (red arrow), steering column tube module (yellow arrow) and the trim around the gauge cluster (green arrow). Please see our articles on these procedures for additional assistance. Remember before removing the air bag and steering wheel to disconnect the ground cable and wait 30 minutes for the electricity to dissipate from the system.

With everything removed you can get access to the switch module from behind the dash (red arrow), but first you need to remove the trim piece the front (yellow arrow).
Figure 2

With everything removed you can get access to the switch module from behind the dash (red arrow), but first you need to remove the trim piece the front (yellow arrow).

While Mercedes sells a special tool for removing the trim piece (red arrow) you can do it with two thin flathead screwdrivers.
Figure 3

While Mercedes sells a special tool for removing the trim piece (red arrow) you can do it with two thin flathead screwdrivers. There are plastic notches on the inside to the trim piece; insert the two screwdrivers until they are seated against the notches and then turn the piece counter clockwise. Make sure the screwdrivers are seated well so you do not risk scratching the trim piece.

Remove the module by reaching in and pushing down on the module with your left hand (red arrow) while pressing in from the front (yellow arrow) with your right hand.
Figure 4

Remove the module by reaching in and pushing down on the module with your left hand (red arrow) while pressing in from the front (yellow arrow) with your right hand.

Slightly turn the unit and press in the tabs on the electrical connections (yellow arrows) and separate the connections from the module.
Figure 5

Slightly turn the unit and press in the tabs on the electrical connections (yellow arrows) and separate the connections from the module.

If you have an automatic transmission you will need to remove the lock out cable.
Figure 6

If you have an automatic transmission you will need to remove the lock out cable. Turn the unit so you have access to the cable on the top. Squeeze in the two clips (red arrows) and slide the cable forward (yellow arrow).

You can now slide the lock out tab up and out from the ignition module (red arrow).
Figure 7

You can now slide the lock out tab up and out from the ignition module (red arrow).

Installation of the new unit is the reverse of removal.
Figure 8

Installation of the new unit is the reverse of removal. Remember you will need to have the vehicle programmed to accept access to the new ignition switch module.


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Comments and Suggestions:
glk350-2010 Comments: Thanks for the work around. I am adding a remote starter to the Mercedes Benz GLK350 2010. How do I reprogram the key/ignition?

Regards,
November 14, 2016
  Followup from the Pelican Staff: You will need an advanced Mercedes-Benz scan tool. - Nick at Pelican Parts  

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