Active steering and DSC failure:/

[bmwdirtracer]

It would seem to me that the steering wheel module/clockspring is incorrectly installed. If this unit is not perfectly aligned, it won't work, and will give exactly the issue you're having. I have never installed a used one, and really don't know how you'd align that.

[328 Power 04]

Also sounds like clockspring ribbon is tearing and possibly shorting.

[bmwdirtracer]

3rd unit....all used. There's an alignment pin there, somewhere, as I recall....I can't find it referred to, on Alldata, but I seem to recall having had this issue once, with a brand new unit, years ago....I think ptarditi helped me to get it realigned. Let me see if I can ask him to weigh in here.

[Bimmers86]

so the clockspring could cause the szl module to not work correctly ? could make sense since i have moved the clockspring over on to the newly installed szl units every time...

[328 Power 04]

Yes, because the U_SZL and U_ISIS signals, as well as airbag and horn go through those wires.

[Bimmers86]

aha. all buttons work. included horn. but i think i might have one more clockspring i can try. but is there a way to align the clockspring in case its been rotated ?

[Bimmers86]

so replacing the slipring is the next step ?

[bmwdirtracer]

Both Alldata and my old TIS, and also Pelican Parts indicate that only new parts can be used for the SZL and the clockspring / slipring. Certainly, the slipring must be taped so that it doesn't turn, when it is removed to do work below. I can't advise on using a used SZL from a different car, because I've never tried that, and have been advised that it can't be reprogrammed to a different car.

https://www.pelicanparts.com/techart...eplacement.htm

[Bimmers86]

You can use , used parts. That i know for a fact. I just installed and coded one of mine now in another car that had problem with steering sensor. Worked perfect there. I think i can skip that part now. But is there a module or a relay that sends signal to szl anywhere ?

[bmwdirtracer]

After studying your screen shots again, I see that you have codes for "Failure in communication between steering wheel control module and steering column control module" That communication takes place through the clockspring / slipring. I'd replace that item, with a brand new part which is locked from the factory, or at the very least with one that was correctly taped in straight ahead position when it was removed.

[Bimmers86]

Ok will do. But cant understand why this should affect the active steering.

[bmwdirtracer]

By the way, what's the production date of your car? I keep guessing, when trying to look up wiring diagrams and other information. We didn't have a diesel here, but everything else will be pretty much the same for a given date.

I saw at the top somewhere that you have ISTA. Can I ask why you're using the older DIS, instead of ISTA? I'd think ISTA's test plans would be more thorough. Certainly, it took me a while to start appreciating ISTA, over the older DIS. Each program has its advantages.... I had hoped that ptarditi would weigh in on this thread. Since he's at the dealership, he'll have seen SZL / active steering issues more than I have.

[Bimmers86]

Old habbit i guess. Dis and ista should be pretty much the same but im not so familiar with ISTA.

[Bimmers86]

Anyone have voltage pinout from szl. Afs module and the sensors on the rack ?
Is F-can the blue and white wire on szl ? Should this go directly to the afs module or to the dsc module ?

[Bimmers86]

Productiondate is 2004/ 03

[bmwdirtracer]

If you connect the car to ISTA, and follow the test plan for your codes, it will give you the wiring diagrams to test, and tell you what to test for.

[Bimmers86]

Status update:
Installed another SZL and slipring.
After coding and fault code delete. i run the calibration test plan. I now can adjust the cummulativ steering angle. (this is the one i have never seen budge from 0 in test plan)
The calibration still failes at the same place but this must be a good sign.it also seems like the DSC light has gone. Have not test driven it but will do later. I had som new fault codes i will upload later also.
Maybe i just have been unlucky with other SZL but they have booth worked in other cars without AS thoug...

[Bimmers86]

Test drove the car and the dsc light came on when i did a hard accelleration. Flat pedal 20 - 70 km /h . When i drive slow it seems to work, but still have AFS light.

[Bimmers86]

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[Bimmers86]

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Never seen the error code on the steering gear before. What is that ? Could it be the planetary gear on the servo motor ?

[328 Power 04]

You need to be calibrating the lateral acceleration sensor and yaw on completely flat and level ground.

[Bimmers86]

I believe i have tried this earlier but will try again they should read 0 when standstill right ?

[Bimmers86]

I think i managed a calibration. But when i run the test plan when car was standstill all values where good measures on...

[Bimmers86]

Still no solution

[bmwdirtracer]

Early on, both Abel and I suggested that the mechanical alignment might be incorrect. IF that's true, IF the physical alignment is out by more than a tiny bit, it's going to piss off the computers every time. I think you've devoted a huge amount of energy and time to working with the computer systems.....and they're still telling you that they're unhappy, and won't finish (or keep)calibration. While you have been exceptionally thorough, you have no equipment to tell you whether the wheels are actually pointed in the correct direction. Find a top quality shop that has a top-quality 4-wheel laser alignment machine, and make sure to get a "before-and-after" report, so you'll know whether you've made an important change.