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06-13-2015, 05:47 AM | #1 | ||
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Cruise Control Failure after coding
One of the things I hate most is working on the car and making it worse than it was
I was interested in adding the dynamic cruise control feature to my car. It uses the brakes when driving down hills to slow you down. My car only has the regular cruise. So i added $544 (cruise control with braking ) to my VO and did FA_WRITE to CAS and NFRM. I then did SG_CODIEREN in expertmode to the CAS,NFRM,DSC and KOMBI modules. Upon cycling the ignition, i get an error message saying "cruise control failure" in the idrive. Scanned the car with INPA and got these obscure errors: Quote:
Quote:
I removed $544 from the VO and recoded the modules but the errors still persist. Now the cruise control doesn't work at all. I tried going into Tool32 and doing the steering angle reset procedure. Process ran fine but didn't fix the problem. Should I update the DSC module with winkfp?
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06-13-2015, 06:26 PM | #4 |
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Unfortunately SZD is not listed as a module for me in INPA or NCS Expert, it think coding is all in the DSC module.
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06-13-2015, 08:48 PM | #5 |
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Tried updating the DSC module with WinKFP. Completed but didn't fix the problem. FYI if you reprogram your DSC you'll have to run all the recalibration items in INPA to get your DSC working properly.
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06-13-2015, 11:53 PM | #7 | |
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Yeah, had a go recoding the modules and no luck.
I think its maybe because I coded $544 without removing $540 (regular cruise). Tried deleting $540 and then adding $544 and it has different behaviour. I no longer get cruise control failure on startup, and no error codes present in INPA. But when I try to activate cruise, I get this code from the DSC module: Quote:
Has anyone got a TRC file for their DSC module? Annoyingly its the only module I haven't got a backup of
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06-14-2015, 06:28 AM | #8 |
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This could not be used since my system also has a problem, but the TRC file which changed each VO and was initialized, is attached.
It may be able to use for comparison. But in my system, 540 and no specifying were the same contents. |
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06-14-2015, 11:21 PM | #9 |
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Thanks for that, I compared but didn't find any real differences.
I think it might be my programming setup has put wrong vo defaults into the DSC I have come up with a workaround, so if I VO code the DSC and KOMBI to $544 (with $540 removed) and then change ACC_AUSSTATTUNG to wert_03 Then I get cruise control with braking, but I don't get the cruise popup display in the cluster that shows the set speed. Otherwise the cruise control works and applies brakes down hills. Not ideal but at least it works. I will see if I can play with the DSC options with the dynamic cruise and see if I can get a working default. Otherwise I will try and reinstall BMW standard tools.
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06-15-2015, 07:43 AM | #10 |
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When adding 544 to VO and setting ACC_AUSSTATTUNG to wert_03, I was surprised that the cruise control operated.
It is that 6 cylinders has 544 functions. When the lever was pulled especially to the front for a long time, it turned out that a brake lamp lights up clearly. It is completely wonderful. I appreciate. However, it is the same that meter is not displayed. I also need to do my best in this dissolution. |
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06-15-2015, 07:50 AM | #11 | |
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Cool, good to see the workaround worked for you as well.
Quote:
Also I am wondering under normal operation does the dynamic cruise control activate the brake lights when braking down hills?
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06-15-2015, 08:37 AM | #12 |
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Since I tested at night, I found out that a brake lamp lit up.
If you continue pulling stalk to -dir, a car will be slowed down strongly and a brake lamp will turn it on the second half. So in the downhill of excessive speed, I guess that a brake lamp lights up. |
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06-17-2015, 05:31 PM | #13 |
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Actually I have now found out theres at least 3 types of cruise control stalk. Theres:
1. A control stalk which has a distance control for active cruise 2. Control stalk with up/down/forwards/backwards (the one I have) 3. Control stalk with up/down and forwards/backwards with 2 positions, light press for 1kph speed increments, strong press for 5kph increments. The 3rd one is used for dynamic cruise. So that would probably explain why option $544 doesn't work because we have the wrong stalk. Probably the can message is different for the stalks and the DSC doesn't like it. The solution might be to buy a new switch column but that doesn't explain why I can't revert to stock. PXF00367, what model and what options are fitted to your car? Did you have any other modifications?
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06-18-2015, 08:05 AM | #14 |
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My 135i is 2007/12 N54 MT CCC, so may be near your car spec, and not carrying out special modification.
I do not think that the difference in a function is brought about by the difference in stalk. stalk which I got is 61319123041 and this is actually common to almost all E8 and E9 series. The information which I have acquired about cruise control is the following. http://www.bmw.com/com/en/insights/t...cruise_control S540A Cruise control S541A Active cruise control S544A Dynamic cruise control Since information is not displayed on kombi, it does not understand in detail, but it seems that my cruise is two steps, 1kph and 10kph. But the rate control in a curve is not certain. I do not know why your setup does not return, either. In search of a 135i owner with other auto-cruise, I am going to acquire information. |
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06-21-2015, 05:23 PM | #16 |
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Attached my kombi trace for option S540A and S544A
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06-30-2015, 07:00 PM | #19 |
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Ah thats a shame. I haven't made any progress either. Tried the latest (that i could find) v54 daten files and didn't make any difference to the programming.
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11-23-2017, 07:40 AM | #20 |
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Vince, did you ever resolve this issue?
It suddenly happened to me after I fitted a donor DSC module (done the same previously without issue). Last time i drove the car to work to program and encode using ISTA/P but this time i used Tool32, NCS Expert and INPA. I have a feeling the Tool32 method of writing the VIN stuffed things up. Even after a full recode in ISTA/P i still have the same problem. I tried connecting both of my spare DSC control units (all are coded to my car), same two faults (A3AF and CDAD) persist. I also went as far as chopping and soldering in a new section of wire for the speed signal output from the DSC to the bundle of wires under the dash, believing i may have disturbed the harness too many times from swapping masters, boosters, DSC modules etc. No change. |
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11-23-2017, 04:05 PM | #21 | ||
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Quote:
I have never bothered to revert the dynamic cruise control after my workaround. The cruise control is great and I wouldnt want to go back to stock, which is when I get that error. I received a pm from Duesentrieb who suggested to reset the Varianten Codierung: Quote:
On N54 I think this is done by going into INPA MSD80, status analog/digital -> digital value -> car equipment ->reset On N54 it learns the car's equipment (one of them being cruise control). It may have gotten stuffed up somehow and you can try this, but might have to be done via tool32 on N55. I have tried this fix to get the popup for the current set speed of the cruise control to display on the cluster but no luck I have not tried to revert back to stock to fix the CDAD and A3AF errors. With my workaround I don't get any errors so might be worth coding in dynamic cruise control $544 if you cant get it working on $540
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11-24-2017, 03:20 AM | #22 |
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Vince - you're a lifesaver man! If you ever come up to Sydney i owe you a beer.
N55 is supported but it's a bit of a hack to get it to work and yes - it's largely in German. So i hooked it back up to ISTA, deleted the DME adaptation values and stored versions (I figured this is as close to your suggestion as possible). Didn't work. Part of the procedure is to wait 30s afterwards, which i did but still no bueno. This is another of those situations where INPA is better than ISTA. I crawled my way through the German menus and then found "gelernte Varienten" amongst the possible adaptations resets. It is the only one with varienten in it. So i clicked it, held my breath and wala.. no more annoying cruise control failure warning punching my nose every time i start the car! Hopefully this helps someone out there. I did find a few threads with no resolution so we are not the only ones suffering this random issue. |
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