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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:

$100 to $400

Talent:

**

Tools:

Philips head screwdriver driver

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Steering column switch module

Hot Tip:

Be sure to disconnect the battery

Performance Gain:

Working switches

Complementary Modification:

Replace steering wheel with upgraded model

Depending on how your Mercedes W123 was optioned you may have a turn signal stock only or one with cruise control attached. If you are having difficulty with the turn signals not working correctly you should check the turn signal relay before changing out the stalk as this is a usual source of problems when the lights start to act up. Please see our article on turn signal relay replacement for additional help.

Whether you have just a turn signal stock or the attached cruise control you will need to get under the dash to disconnect the wiring. This is one of those spots where over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

NOTE: We have removed the steering wheel so we could get pictures of wiring but you do not need to remove your wheel to replace the stalk.

Disconnect the negative battery cable (red arrow).
Figure 1

Disconnect the negative battery cable (red arrow). Make sure it cannot make accidental contact with the battery while working.

Remove the five screws holding the under dash panel and remove the panel, please see our article on under dash panel removal for additional information if you need it.
Figure 2

Remove the five screws holding the under dash panel and remove the panel, please see our article on under dash panel removal for additional information if you need it.

With the panel removed follow the cable from the turn signal stalk until you come to the connection up under the dash.
Figure 3

With the panel removed follow the cable from the turn signal stalk until you come to the connection up under the dash. There are a lot of pins in this connection so take your time and wiggle and pull it apart (red arrow).

If your vehicle has cruise control follow that wiring harness up to its connection point up above the brake pedal and disconnect it (red arrow).
Figure 4

If your vehicle has cruise control follow that wiring harness up to its connection point up above the brake pedal and disconnect it (red arrow).

Move to the steering column and using your hands pull back and remove the rubber cover over the turn signal stock.
Figure 5

Move to the steering column and using your hands pull back and remove the rubber cover over the turn signal stock.

There are four Philips heads screws you need to remove; the two larger at the front of the stalk (red arrows) hold the stalk in position and these are usually screwed in pretty tight so be careful not to strip them.
Figure 6

There are four Philips heads screws you need to remove; the two larger at the front of the stalk (red arrows) hold the stalk in position and these are usually screwed in pretty tight so be careful not to strip them. The smaller two screws on the rear (yellow arrows) are for the horn contacts. Use you Philips head screwdriver and remove the front screw and you just need to loosen the rear screws until the wires slip out.

Remove the stalk from the column feeding the wiring harness(s) through as you remove it.
Figure 7

Remove the stalk from the column feeding the wiring harness(s) through as you remove it. Installation is the reverse of removal.

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