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the SCM is the steering column control module. This lives in your steering column between all of the stalks on the column. You have to remove the steering wheel, air bag and the SCM module to disassemble it and replace it. Also you have to be careful of steering wheel placement when re-installing, along with the torque of the center bolt and of course the airbag.
The car reports it, I scanned the codes out.
Resetting the fault (9001 I believe) bring back the code immediately: 'stored and current' condition.
I verified my clock spring, the transmission is receiving the shift button signals but the SCM doesn't see any values coming through.
the SCM is the steering column control module. This lives in your steering column between all of the stalks on the column. You have to remove the steering wheel, air bag and the SCM module to disassemble it and replace it. Also you have to be careful of steering wheel placement when re-installing, along with the torque of the center bolt and of course the airbag.
Is that close to the steering angle sensor or the same thing? I had my mechanic do the steering angle sensor and all he did was watch the video on youtube on how to do it and took about an hour. Only really tough part was getting the center bolt holding the steering wheel on off. He had the air gun though and it came right off, didn't really budge with just hand tools. Video has you disconnecting the car battery so no accidental airbag discharge when disconnecting. You also need a long torx screwdriver to get at the screws under the steering wheel. You can use a marker to mark the gears of the steering wheel to make sure it goes on exactly the same as it came off.
Is that close to the steering angle sensor or the same thing? I had my mechanic do the steering angle sensor and all he did was watch the video on youtube on how to do it and took about an hour. Only really tough part was getting the center bolt holding the steering wheel on off. He had the air gun though and it came right off, didn't really budge with just hand tools. Video has you disconnecting the car battery so no accidental airbag discharge when disconnecting. You also need a long torx screwdriver to get at the screws under the steering wheel. You can use a marker to mark the gears of the steering wheel to make sure it goes on exactly the same as it came off.
The steering angle sensor is part of the steering column module. As for hammering the old center bolt back on, no thanks.. New bolt is cheap and by torquing it back down to spec, you don't have to worry about damaging anything.
SCM is a very positive module to get working well. People in this thread can attest that steering wheel work was fairly simple. Thank God MrK. skillfully located all the precious docs to help guide progress. Its a complete DIY empowerment.
Simply resolder the loose connector pins carefully left out to get your attention. The bonus is EIS nearby ... the result is a mind boggling engine/tranny improvements (Look at link in my signature).
Last edited by CaliBenzDriver; 05-01-2023 at 02:50 PM.
Does this SCM control the buttons on the steering wheel or the horn? I have no horn, or steering wheel buttons. This weekend I replaced the clock spring and that didn't help. I also have checked all related fuses and relays. Banging my head against the wall on this one.
The Steering Control Module directly controls the Steering Angle Sensor. It also acts as a pass-thru for everything attached to the steering column... so yes horn, wheel control buttons, shift paddles, turn signals, wipers...
SCM is built with pressed pins circuit boards that have a limited reliability. Fortunately its easy to work with once you have the wheel removed (center your wheel at 0°Ref. to help reassembly or better follow WIS procedures).
> PRACTICALLY:
Proceed by layers or just do it all right at once
SCM is built like an interconnected sandwich stack of modules, connectors, boards.
- Either you spend time splitting-hair about testing where your issue is located then order a collection of parts...
-OR you solder all loose pins then test all works well afterwards.
- INCENTIVE:
SCM "wheel position sensor" is a super busy module for these cars with smart braking functions.
Read that...:
Once I've fixed my low mileage SCM & EIS, my tranny started to shift remarkably fast... "No faults" go figure!
So yeah, a working horn is good but this failure is an opportunity to do a lot of good with a little spare time.
Steering column top has a dry ball bearing that's waiting for lubricant to make your steering wheel velvet smooth.
This small problem can be treated as an opportunity for vast improvements! A quick cheap job can be good enough.
Last edited by CaliBenzDriver; 05-01-2023 at 02:50 PM.
one layer of SCM with dry bearing race and loose pins (w212)
Have a look at your column for positive opportunities to improve many issues at once.
Follow your horn connection to clock-spring to SCM sandwich stack... post pics of these connections if you will
Last edited by CaliBenzDriver; 05-01-2023 at 04:01 PM.
I'm a little confused on this for some reason. This is a picture of the back side of my steering column before removing from cover. Are you saying if I remove this out of the cover I will see what your picture is showing? Or will I have it dismantle it more to see what you are showing?? Mine looks a lot different than what you are posting. I'm driving an E55, is yours a different model of car?
I'm a little confused on this for some reason. This is a picture of the back side of my steering column before removing from cover.
Are you saying if I remove this out of the cover I will see what your picture is showing? Or will I have it dismantle it more to see what you are showing??
Mine looks a lot different than what you are posting. I'm driving an E55, is yours a different model of car?
Yes different chassis, different options, different years but similar technology.
You can test signals from horn button using a scanner with live car data.... then closely inspect SCM.
N80 is the hub module
You can concentrate on N80 known as SCM where all options connect to.
Last edited by CaliBenzDriver; 05-01-2023 at 06:34 PM.
12-21-2017, 08:45 PM
