ACC retrofit-Active Cruise Control

Recently the ACC in my 2004 740d stopped working from one day to the next.
When I try to engage it I just get the "---km/h" for a few seconds on my speedometer as if my speed was below 30km/h where it shouldn't engage.
Could this be the ACC-sensor itself or some other speed input to the ACC?
I just got INPA installed on my laptop but I'm having a bit of difficulty finding my way around there. I managed to navigate to the ACC in the menues but couldn't figure out how to simply get a reading from the sensor to see if it's working or not.

Originally Posted by Hamilton1974

Recently the ACC in my 2004 740d stopped working from one day to the next.
When I try to engage it I just get the "---km/h" for a few seconds on my speedometer as if my speed was below 30km/h where it shouldn't engage.
Could this be the ACC-sensor itself or some other speed input to the ACC?
I just got INPA installed on my laptop but I'm having a bit of difficulty finding my way around there. I managed to navigate to the ACC in the menues but couldn't figure out how to simply get a reading from the sensor to see if it's working or not.

Have you scanned the car for errors ?

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I think I managed to do that and couldn't see any faults relating to the ACC. But I might be mistaken, as I said I had some problems understanding things in INPA.
As soon as I get a chance to plug into the car again I'll get some screenshots of what I get when I look at the faults.
Temps are still below freezing most days and I don't have a warm garage to work in so I might need to wait until it gets a bit warmer.

Originally Posted by Hamilton1974

I think I managed to do that and couldn't see any faults relating to the ACC. But I might be mistaken, as I said I had some problems understanding things in INPA.
As soon as I get a chance to plug into the car again I'll get some screenshots of what I get when I look at the faults.
Temps are still below freezing most days and I don't have a warm garage to work in so I might need to wait until it gets a bit warmer.

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Sorry for the long read but I really nead help with this.

I changed out my ACC2 sensor (after breaking mine) for one from an E91. I set it up in inpa, aligned it and it didn't work.. I hade 2 errors in the acc wich I managed to remove by resetting the VVT (I think) in the engine controll unit.

Now to the wierd thing. It started working but only as a normal cruise control not able to see what speed i'v set in the dash and not keeping the distance to the car in front and it doesn't really know what gear to be in in low speeds, changing rapidly up and down if I don't set the gearbox to manual mode.

I have communication errors with the ACC in the DSC, EGS, KOMBI and probably something els. I am able to communicate with it fully through INPA but I can't read out the coding of thr acc with NCS exper and I have yet not figured out how to flash the module with Winkfp, just some failed attempts.

I even tried to connect the old broken ACC2 and to behold it worked and all the errors in the control units disappeared and I was able to read out thr coding from the old "broken" ACC2. And then I connected the new one and the same problems reappeared...

Does anyone have any suggestions I'm kinda stuck here at the moment?

Originally Posted by rippjd

According to the Service Literature for the E65 and E60... the E65/E66 has always used the Bosch DSC 5.7 system. This has a single brake pressure sensor attached to the DSC block. In contrast, at introduction the E60/E61/E63/E64 used the Bosch DSC8 system which normally has no external brake pressure sensors. If ACC was fitted to the E60/E61/E63/E64 then BMW installed 2 external brake pressure sensors in-line (one each for front and rear circuits). Note the different brake parts diagrams in ETK depending on if you have option 541 or not. I assume there is no provision on the DSC8 block for a single pressure sensor?
Then later BMW put the DSC8+ system on the E60/E61/E63/E64 which eliminated the external pressure sensors, but allowed ACC with Stop & Go by adding SRR sensors (Short Range Radar).

From 05_E60 Chassis Dynamics
Dynamic Stability Control DSC8
Dynamic Stability Control DSC8 manufactured by Bosch is used for the first time in the E60.
New system features:
• The hardware component of DSC8 is a newly developed component.
• The electric precharging pump (eVLP) has now been omitted.
• The DSC module is connected to the Powertrain CAN (PT-CAN) and to the Chassis
CAN (F-CAN).
• 2 new pressure sensors are incorporated in the brake lines in the ACC optional
extra.
Advantages of System Over DSC5.7
DSC8 has the following advantages over DSC5.7:
• 25% lower structural volume
• 30% lighter (saving 700 g in the module, saving of 1.8 kg through omission of the
electric precharging pump)
• Control-unit memory 768 kB ROM (previously 256 kB ROM)
• Processor computing cycle time 5 to 10 ms (previously 20 ms)

I might try this retrofit myself as I already have the ACC wires pulled from a used main harness.

i find DSC part 34516783365 but not found, on ebay only part 34516783360
and i don't know part on item 34516783360-01 what -01? anyone help me...
thank you

Originally Posted by vibbelito

Sorry for the long read but I really nead help with this.

I changed out my ACC2 sensor (after breaking mine) for one from an E91.

I installed an ACC2 sensor from an E60 into my E65. It did not work correctly until I coded it with the E65 settings. Eventually I flashed it with newer software and it worked well. I always wondered if the E90/E91/E92 sensor was the same hardware as the E60/E65. At a minimum, I suspect the E91 software is incorrect for the E65. You may need to force flash using WinKFP... and not use "comfort" mode?

Originally Posted by rippjd

I installed an ACC2 sensor from an E60 into my E65. It did not work correctly until I coded it with the E65 settings. Eventually I flashed it with newer software and it worked well. I always wondered if the E90/E91/E92 sensor was the same hardware as the E60/E65. At a minimum, I suspect the E91 software is incorrect for the E65. You may need to force flash using WinKFP... and not use "comfort" mode?

Yes I am also suspecting that the software for the E90 is completely different. Is there anyone here that has mounted the ACC from an E90 onto an E65?
If I remember right, the VIN coded to the acc is from an E91 but the UIF says e60, sooo...

Onto the Winkfp thing. I have been trying to flash it but always gets all different kinds of errors. (in comfort mode) mostly that it cannot find the ZB when I enter the one from INPA. If I go to "update module" and chose the module manually it cannot find the address or something like that or the other way around. Or I get some other errors.

I have been trying to find a good guide to force flash it preferably to the same software as the old "broken" ACC2 sensor but with no luck.. So if someone could find some sort of guide for that it would be appreciated!

I think NCS also gives me an error that it cannot find the module.

Something interesting, in INPA in the ACC module there is an expert mode where you can do all kinds of things, but the coding part of it you need a password to access wich I cannot seem to find...

This is the new sensor

The coding index of the old ACC found in INPA


And the coding index of the new one from the E91. This is the only way I'm able to read the coding of it since I can't access it via NCS


I then wrote it to a NETTODAT.TRC file to be able to read it in NCS Dummy and compare the coding from the new and old one and it sure differece a lot between the two.

There is a way to download the coding index and rewrite it but I haven't been able to import it back to the ACC via INPA as of yet.

I won't give up just yet. Let's see how deep this rabbit hole can go.

I will try to force flash the software from the E65 when I figure out how

Update: I think I managed to force flash the ACC successfully with the software from the E65.
1 attempt. I first got an error saying projects don't match and at the first try flashing I got an error and the flashing did not succeed but I could still find the acc in the INPA UIF section with its address but all other things were missing. (it might have failed due to lpw battery) I then drove the car for 30min an the acc worked as previously (only as a normal cruise control)

2nd attempt I got the same message that projects don't match but this time it flashed the software successfully and I got a whole bunch of errors in inpa, cleared them and locked the car to let it go to sleep.

I will update later if it worked and post screenshots.

Originally Posted by rippjd

I finally made some time to attempt alignment of my used ACC2 sensor.

Background:
The sensor came from a model year 2006 E60/E61 5-series, manufactured in June 2006. It is still running the original software, 6 773 712, versus the newer 6 779 874. A 5D14 ACC2: SENSOR MALADJUSTED fault was logged at 27216 km (16911 miles) with "Betriebsstundenzaehler = 401.38 Stunden" or "Operating hours = 401.38 hours". Divide the miles by operating hours and you get about 42 mph average. This seems feasible for a vehicle run mostly on the highway and confirms this ACC2 sensor has low miles.

With the ACC2 sensor installed on my 2005 E65, I cleared the fault and it immediately returned, however this time it showed the km from my vehicle. Several other communication errors came up for other modules (DSC, EGS, DME, KOMBI).
===============
Coding:
I wrote option $541 to the SA list for both my CAS and LMA modules. Then used NCSExpert to read the coding data from the ACC2 sensor and it came back as using the ACC2_E60.C27 file. There is one newer, coding index C28, which likely would be used if the latest software was flashed to this sensor. I then default coded the module and exported the differences - see below. Now it's ready for use in the 7-series!
===============
Alignment:
First I tried ISTA/D with the vehicle 120 cm in front of a piece of particle board. The procedure did warn me "improved coding data are available for detecting ACC sensor misalignment, re-encode ACC control unit with Progman Version 30.0 or higher". Either-way, the alignment procedure failed due to "reception level too low".

Next I found a square fiberglass utility box in a relatively flat parking lot. I tried INPA this time as this software tends to give you more information than the "hold my hand" ISTA/D. F6 goes to ACTIVATE, then F6 for JUSTAGE or "Adjustment", then F3 again for JUSTAGE and you will go through 3 separate processes, each having several Steps.
The first process is typing values from the BMW special tooling (wheel clamps, laser, mirror, etc), which of course I do not have. I typed in 4 dummy values to move on.
On the second process you get Amplitude values (signal strength). This time the fiberglass apparently reflected enough radar that I had real values (around 700). I didn't have the correct driver bit on me, but went through the process until Step 10 when INPA let me know I failed the alignment procedure.

Next I found a metal dumpster in a different parking lot and came prepared with a metric tape measure and Torx bit to adjust screws from the back. Note the Amplitudes are much higher (around 5000) with metal. Vertical adjustment (Step 6) was already almost perfect. Horizontal was off quite a bit initially, over +0.2 to the right, then I went too far to the left - see Step 8 & 9. A slight rotation of the lower right screw (Step 8 adj & 9 adj) and INPA was happy - see Step 10 adj.

Lastly I hit F5 and went through 5 more steps where the adjustment offsets were written to the ACC2 module, faults were cleared and I was ready to go.
=================
Test Drive:
I went for a drive to see if you really had to code any modules other than the ACC2. I had the same message in the instrument cluster pop up as soon as I pulled the cruise control stalk. I ran ISTA/D. Now only the KOMBI and ACC2 had faults:
A3AF No message from DME, receiver KOMBI, transmitter DME-DDE
CD38 ACC2: ACC in system network not detected

I default coded the KOMBI to let it know the car now had ACC2. Obviously you do need to code the KOMBI. I cleared the two faults and went for another drive. To my amazement ACC worked. It braked more than I would like when the car in front of me moved over one lane to the left, as apparently the sensor thought the car was still partially in my lane... but for a very rough alignment with nothing more than a tape measure and garbage dumpster, I'll take it.

Once I drive it more, I'll provide more feedback. I may also flash newer software and try the ISTA/D procedure again.


For those who want better accuracy... check out the homemade tool in the middle of this page:
http://www.audi4ever.com/forumv2/ind...topic=62730.20

And here is the factory Audi tool which I believe is aligning the same Bosch sensor. See the 2nd video:
http://www.pro-align.co.uk/adr-acc-video-page/

I install acc2 on my E60 535i, i need DSC 8 but part i find on Ebay 34516783360, this part can use on my car? on realoem DSC8 Part 34516783365... please help me

Originally Posted by inspi

And final adjustment

Attachment 474747 Attachment 474748
Attachment 474749 Attachment 474750

I need calibration it on my E60 535i, How do you calibration use ISTA?
Can you help me calibration acc2!
Thank you

My ACC1 including the connector and stalk is available - it is the one I retrofit into my 2002 e65 745i. 100% worked like a dream. The new e66 already had ACC installed, so I no longer need this one.

Originally Posted by osc

My ACC including the connector and stalk is available - it is the one I retrofit into my 2002 e65 745i. 100% worked like a dream. The new e66 already had ACC installed, so I no longer need this one.

Is it acc2?

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Originally Posted by vibbelito

is it acc2?

acc1

Late question
I don’t understand where to put the wires from caped connection behind de bumper?and where to take ground wire?


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So please help me...
Fuse wire where I must put it?
Cas wire where is must put it?
And the wires from capped connections where I must put them...


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Post #6 has part of the wiring diagram. Search for "BMW WDS" and you can find the entire diagram along with locations.