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Steering Column Switch/ Tube Module Replacement
 
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Pelican Technical Article:

Steering Column Switch/ Tube Module Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$260

Talent:

**

Tools:

Small flathead screwdriver driver

Applicable Models:

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

Parts Required:

Steering column tube module

Hot Tip:

Be sure to disconnect the battery and wait 30 minutes

Performance Gain:

Working switches

Complementary Modification:

Replace steering wheel with upgraded model

For the W204 series Mercedes has replaced all the switches on the console with a singular steering tube module. This means if your switches, clock spring, horn, steering angle sensor or other components fail you have to replace the entire module. While the module is not cheap it is at least easy to replace.

The airbag and steering wheel removal is required for this repair. When you remove the driver airbag, it is important you disconnect the battery and wait at least 30 minutes for any residual electricity in the system to dissipate. Once the airbag is removed, store it in a safe place facing up. If you connect the battery with the air bag removed it will cause a fault code and warning light that you will have to reset. If you do not connect the battery you can put everything back together without having to worry about this.

Please see our article on steering wheel removal and do not forget to disconnect the negative battery cable. Make sure it can't make accidental contact with the battery and allow 30 minutes for all the electricity to dissipate out of the vehicle.

To replace the steering column tube module you will need to first remove the steering wheel (red arrow) and the trim piece around the gauge cluster (yellow arrow).
Figure 1

To replace the steering column tube module you will need to first remove the steering wheel (red arrow) and the trim piece around the gauge cluster (yellow arrow). Please see our articles on these procedures for additional information.

With the wheel and trim piece removed unclip the leather bag that connects the steering column tube module to the dash.
Figure 2

With the wheel and trim piece removed unclip the leather bag that connects the steering column tube module to the dash. Use your hands and simply squeeze it in and unsnap it from the dash (red arrow).

With the leather surround unclipped you can slide the module forward and off the steering column shaft (red arrow).
Figure 3

With the leather surround unclipped you can slide the module forward and off the steering column shaft (red arrow).

The wiring harness connects to the inside of the module.
Figure 4

The wiring harness connects to the inside of the module. Turn it over and use a small flathead screwdriver to release the plastic plug on the top of the switch connection (red arrow). Keep this plug, as you will want to reinstall it when replacing the unit.

With the tab off you can use the small flathead screwdriver to release the tab on the connection (red arrow) and separate the wiring connection.
Figure 5

With the tab off you can use the small flathead screwdriver to release the tab on the connection (red arrow) and separate the wiring connection. The harness is attached to the inside of the module. Use your screwdriver and release the tab on the harness (yellow arrow) and remove it from the module.

Installation of the new module is the reverse of removal.
Figure 6

Installation of the new module is the reverse of removal. There will be a transportation safety devise on the front of the unit. Do not remove this until the unit is in place on the steering column.

After connecting the wiring harness make sure to reinsert the plastic plug into the connection (red arrow).
Figure 7

After connecting the wiring harness make sure to reinsert the plastic plug into the connection (red arrow).


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Page last updated: Fri 12/2/2016 02:55:50 AM