New (to me) '14 S7, couple issues

[joe_momma]

Picked up a '14 S7 last week, one owner 108k miles. Has a couple of issues I need some guidance on:

1 - cruise doesn't work, error on the dash is "ACC and Audi brake guard: currently unavailable. No sensor vision". I haven't checked the two (?) sensors up front for damage yet, anything in particular to check for? Loose connections, dirty contacts, etc?

2 - driver heated/cooled seats - don't appear to work. The dash indicator for heating comes on for 15-20 seconds and then turns off (all 3 levels do the same thing). Seats don't appear to warm. Nothing seems to happen with the cooling feature when it turns on. Massage function works well. Any ideas here?

100k mile service - I don't know if this was completed or not. Manual says timing belt inspection is due - best to just replace it while you're in there I'm guessing?

So far, loving the car.

[STXA7]

Picked up a '14 S7 last week, one owner 108k miles. Has a couple of issues I need some guidance on:

1 - cruise doesn't work, error on the dash is "ACC and Audi brake guard: currently unavailable. No sensor vision". I haven't checked the two (?) sensors up front for damage yet, anything in particular to check for? Loose connections, dirty contacts, etc?

2 - driver heated/cooled seats - don't appear to work. The dash indicator for heating comes on for 15-20 seconds and then turns off (all 3 levels do the same thing). Seats don't appear to warm. Nothing seems to happen with the cooling feature when it turns on. Massage function works well. Any ideas here?

100k mile service - I don't know if this was completed or not. Manual says timing belt inspection is due - best to just replace it while you're in there I'm guessing?

So far, loving the car.

The type of people on this forum that could answer your questions might ask for a VCDS log to check for errors etc it’s a plug in diagnostic tool for VAG cars.

There’s a atleast one large thread regarding the ACC errors. In some cases the actual rear view mirror integrated camera sensor board has failed. Apparently you can send it in to a 3rd party repair type place that will “re-ball” the solder on the board. Last time I read it, the story was that dealers are on indefinite back order even if you have the couple thousand they charge for a new unit.

In my experience I’ve had auto cruise control disable, and side warning disable when there were loose connectors up in the front bumper area, and once was the home link module corrosion on a wire. (Garage door opening stopped functioning)

Changing all your fuses in (both ? ) fuse box(es) is inexpensive and worth a try

Electric cleaner spray and clipping in all the various connections would be more involved and require some DIY aptitude


Sent from my iPhone using Audizine Forum

[joe_momma]

Thanks for the info...I plan to get it up in the air this weekend for an oil change and I'll check/clean all the connections up front while I have it in the air. I was going to check/replace the fuses for the seats as well - I've seen fuses that looked "good" actually be bad. Might not be a bad idea to just inventory them all and get what I need to replace all of them. Fuses are cheap enough that I won't feel like I'm just throwing parts at it lol. I'm planning to get VCDS soon, seems like a mandatory tool for these cars.

[Akakios]

VCDS code read out or OBD11 please. We are all just guessing based on experience until then.

[joe_momma]

Ordered VCDS yesterday, hope to have it Monday.

[joshtowe]

For the ACC issue, a “no sensor vision” error typically means there’s a physical issue with one of the bumper mounted sensors. If it was an issue with the camera, it would say “no camera vision” and you’d definitely have a lane assist error too as the ACC and lane assist both utilize the mirror camera.

I had the exact same issue on my 2014 A7 when I first bought it a couple months ago. I’ve read that the sensors in the bumper can sometimes pop out of the mounting bracket and can give an intermittent “no sensor vision” error. I went and put some pressure on each sensor and I heard the driver side sensor make a little “click” noise which I assume was the sensor being popped into place. It’s been 4k miles since then and the error hasn’t popped up a single time. I’d give that a try. I can guarantee you it has nothing to do with the camera.

[Avantly]

I've had both of my ACC sensors fail and in both cases it was because weather plugs were not put in the unused pin holes in the connector shell. Water made it in and ate the pins. The sensor side connector is removable and is essentially a custom molded male header. I had to extract the old pins replace them with some gold plated pins from a standard .100" PCB header. It was a bit of work but that was around 2 years ago and no problems since. I put a little U shaped crimp in the middle of the pins to help retain them in the connector body, and used a syringe to inject epoxy into the holes after the pins were inserted and aligned (by refastening the connector body back on to the ACC sensor). I didn't have the exact type of weather plug used for that connector but I had some for something similar (probably a standard deutsch or delphi) and those worked just fine. In my case, only the pins on the outer side of the ACC connector body were corroded; Once removed from the sensor, the other side (which insert into a female header on the ACC circuit board) were in good shape. I also replaced the terminals in the harness connector shell as they were done for.

[joe_momma]

Thanks for the info. Updated shipping says delivery is tomorrow so I should have some info by Wednesday. I did see a YT video where a guy had some corrosion in one of the pins at the ACC module, and cleaning that up fixed his issue.

[Avantly]

Mine were so corroded that the +12V pin had basically disappeared on the master sensor xD

FYI if the master sensor isn't working, neither sensor is detected. I can't remember which side is master.

[joe_momma]

Good info! Based on the video I saw the driver side is the master, but that's info from one YouTube video so take it with a grain of salt.

[Avantly]

Nowadays I take everything including the OEM service info with a grain of salt xD

[joe_momma]

Ran the VCDS scan - I did see some faults in modules related to the ACC. Anything specific I should post or be looking for that would help you guys?
Also, it reported a short to + on the driver seat bottom heating element. Guess I have some wiring to dig into....

[Valpo A7]

There is a video out there by samcrac on an RS7 that talked about home alignment for the ACC radars in the front of the car. Dealer will charge several hundred $$ for it.

Heated seat could be as simple as a fuse or as bad as a broken heating element in the seat itself.

The car has a timing chain and not a belt. It’s an engine out repair.

I would be more worried about if the transmission service is up to date. You will also want to check in to the turbo oil screen recall to make sure it’s done. There is a TSB about the PCV valve as well that carried an extended warranty but you are likely outside that extended warranty now.

[Avantly]

If both ACC sensors are talking (they are at separate addresses) then the problem won't be the pin corrosion I referenced - When that happens, they don't talk. Without seeing codes I can't speculate further.

[joe_momma]

Here are the codes I was able to see in the log (bear with me - first time using VCDS so I'm a complete noob with it)...if there are other addresses I should check please let me know:
Address 05: Acc/Start Auth. (J393) Labels:. 8K0-907-064-05.clb
Part No SW: 4H0 907 064 DR HW: 4H0 907 064 DR
Component: BCM2 2.0 H35 0510
Revision: 00002001
Coding: 0D8A2046000000000000
Shop #: WSC 02391 785 00200
VCID: 7CA62AAB16E7E4CAD3F-8028

Subsystem 2 - Part No SW: 4H0 905 852 C HW: 4H0 905 852 C
Component: J764 ELV MLB H40 0046
Serial number: 0213000329403005

1 Fault Found:
00956 - Key 2
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 01100010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 163
Mileage: 174959 km
Time Indication: 0
Date: 2025.01.08
Time: 11:42:26

Address 13: Auto Dist. Reg (J428) Labels:| 4H0-907-561.clb
Part No SW: 4G0 907 561 A HW: 4G0 907 561
Component: ACC3 H19 0410
Serial number: 00000000000000 Dataset Number: 4G8909863C 0032
Coding: 7601010101
Shop #: WSC 02391 785 00200
ASAM Dataset: EV_AdaptCruisContrAU57X 002010
ROD: EV_AdaptCruisContrAU57X_002_AU57.rod
VCID: 280E26FBB27F986AE77-807C

3 Faults Found:
10240 - Sensor for Automatic Distance Control
C110B F0 [00001000] - Limited Visibility
[FAULT_BLR_BLK8_31]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 7
Fault Frequency: 155
Reset counter: 234
Mileage: 173779 km
Date: 2024.07.01
Time: 09:23:25

Control Module temperature: 34 C
Voltage terminal 15: 14.012 V
Velocity_vehicle_reference: 11.76 m/s
Longitudinal_acceleration_vehicle_reference: 0.28 m/s

145152 - Function Restriction due to Faults in Other Modules
U1113 00 [00001000] - -
[FAULT_CIS_SWA_FAIL]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 212
Mileage: 175048 km
Date: 2025.03.20
Time: 16:45:41

Control Module temperature: 22 C
Voltage terminal 15: 14.408 V
Velocity_vehicle_reference: 3.14 m/s
Longitudinal_acceleration_vehicle_reference: -0.04 m/s

93440 - Function Restriction due to Faults in Other Modules
U1113 00 [00001001] - -
[FAULT_CIS_VIDEO_FAIL]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 254
Reset counter: 194
Mileage: 173778 km
Date: 2024.06.28
Time: 14:35:31

Control Module temperature: 37 C
Voltage terminal 15: 13.896 V
Velocity_vehicle_reference: -0.01 m/s
Longitudinal_acceleration_vehicle_reference: 0.00 m/s


Address 8B: Adaptive Cruise 2 (J428) Labels:| 4H0-907-561.clb
Part No SW: 4G0 907 541 A HW: 4G0 907 541
Component: ACC3 H19 0400
Serial number: 00000000000000
Coding: 7601010101
Shop #: WSC 02391 785 00200
ASAM Dataset: EV_AdaptCruisContr2AU57X 002008
ROD: EV_AdaptCruisContr2AU57X_002_AU57.rod
VCID: 261228C3B86B8E1AD5B-8072

1 Fault Found:
145152 - Function Restriction due to Faults in Other Modules
U1113 00 [00001000] - -
[FAULT_CIS_SWA_FAIL]
Intermittent - Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 6
Fault Frequency: 1
Reset counter: 212
Mileage: 175048 km
Date: 2025.03.20
Time: 16:45:41

Control Module temperature: 19 C
Voltage terminal 15: 14.453 V
Velocity_vehicle_reference: 3.05 m/s
Longitudinal_acceleration_vehicle_reference: -0.03 m/s



I'm thinking I should make a separate thread for the heated/cooled seat issue to keep this one cleaner in regards to the ACC. I did see a fault on the driver seat module (short to plus) but I haven't dug in to that yet. As a possible positive - it does seem the cooling feature works, it's just not as prevalent as the cooling feature in the wife's old RX350.

[Avantly]

You need to take a close look at the right side ACC sensor. Compare its height, mounting, etc to the left side. Inspect the grille around it carefully. Is the right side sensor centered in the hole in the grille/cover just like the left? Is the distance between the face of the sensor and the inside edge of the grille the same on both sides? The sensor seems to be indicating that it is seeing a close reflection, i.e. immediately in front of the sensor somewhere. It could be the result of damage to the sensor, but if it appears undamaged then you need to inspect everything around it and it's mounting first. Also you need to check and make sure some dingus didn't put a coat of paint on it as I am pretty sure that will give you a limited visibility error as well.

For maintenance make sure you take a close look at the maintenance schedule for the car, and I'd highly recommend determining maintenance history - I would do a combination of getting the car added to a "my audi" account to see previous dealer history combined with a carfax report, if you don't already have the carfax report there are sites out there which offer cheap third party carfax reports for around 5 bucks, I wouldn't pay full price for a carfax as it is not worth it imo.

Research the oil screen issue and recall, find out when transmission fluids+filters and rear sport diff were serviced last, etc.

[joe_momma]

Thanks - this weekend looks to be a washout so I should have some time to inspect the modules closely. I think the plastic around the modules just pops out? I was going to inspect the connections and make sure they're clean while in the area.

I did check the VIN with the Audi website and it showed no open recalls, so I'm guessing it has had the oil screen done. I do have the CarFax on it (dealership provided it). I need to run it through the My Audi app and see if any Audi dealership work shows. Do you know the service mileage for the trans and diff by chance?

[Valpo A7]

OK for the DSG trans I saw 35,000 miles for the first time then 40,0000 mile intervals after that. If you have a sport rear diff then there is an interval for that as well.

https://di-uploads-development.s3.us...-Year-2014.pdf

Now if you do not have the sport diff then Audi approaches it as fluid for life. I know on my old A7 I first changed both standard diffs and the center transfer at 200K miles and all was still good.

[Avantly]

All S6 and S7 should have sport diff I think?

When I added my S6 to the audi website it took about 2 weeks for the previous dealer service info to appear.

For the ACC sensors, I suspect you will find something is just off with the mounting or grille, and yes the grills do pop off like the older cars, starting with one side.

[joe_momma]

Looks like I need to plan to service the trans (fluid/filter) and spark plugs soon.

[Botbasher]

I did check the VIN with the Audi website ....

When I added my S6 to the audi website it took about 2 weeks for the previous dealer service info to appear.

What Audi websites are you doing this with?

Thanks!!

KS

[Avantly]

What Audi website are you doing this with?

Thanks!!

KS

You have to create an account using your real name on the myAudi site, then add your VIN to your vehicle list. There is some sort of verification process where they verify the name with the VIN, and when this is completed you should then see any dealer service performed on your vehicle. IIRC mine isn't complete, it goes back to around 2015, but it does show all the dealer performed scheduled maintenance done before I purchased it and ironically shows services that don't appear on the carfax. I haven't trusted carfax in a long time after purchasing two vehicles in the past decade that were previously totaled (sellers were honest about it; but vehicle still had green title) and carfax showed no accidents despite the repairs being done at a licensed body shop. Carfax only shows data that people are willing to sell to them, but myAudi dealer history should show everything right down to inane things like a gas cap replacement.

[Botbasher]

You have to create an account using your real name on the myAudi site, then add your VIN to your vehicle list. There is some sort of verification process where they verify the name with the VIN, and when this is completed you should then see any dealer service performed on your vehicle.

I got... Vehicle information failed to load

We are unable to load the information for your vehicle. Please try reloading the page.

I presume it'll eventually populate?? My car was dealer serviced till 85k (soccer moms ride), I bought it at 96, so there is little it shouldn't show but I'd like to see the history!

The other thing I've always looked for is a way to get the PR Code sheet. My car was custom ordered, so it didn't get one in the trunk for some reason and when I asked Audi NA, I got 20 pages of "possible" PR Codes that could be on the car. Cest La Vie!

Thanks for the info!

KS

[Avantly]

I got... Vehicle information failed to load

We are unable to load the information for your vehicle. Please try reloading the page.

I presume it'll eventually populate?? My car was dealer serviced till 85k (soccer moms ride), I bought it at 96, so there is little it shouldn't show but I'd like to see the history!

The other thing I've always looked for is a way to get the PR Code sheet. My car was custom ordered, so it didn't get one in the trunk for some reason and when I asked Audi NA, I got 20 pages of "possible" PR Codes that could be on the car. Cest La Vie!

Thanks for the info!

KS

Mine said that for about 2 weeks and then suddenly it all popped up!

[joe_momma]

As far as recall status - I just Googled "Audi recall status" and it took me to an Audi page where I entered my VIN. I have the myAudi app, but I'm going to check the website out - looks like it has more features.

EDIT to add: MyAudi website pulled the service history (I got the app and entered the VIN a week or so ago). Trans was serviced (fluid) at 65k, plugs were done at 75k, and brake pads/rotors at 80k. No mention of any diff service.

[Valpo A7]

Looks like the rear sport diff should have been done at 60,000 miles. As I understand there are 2 fluids that go in it and each are separate. Front diff at 120,000 miles. If the trans was serviced at 65K then its due. When they did the plugs hopefully they changed all 8. There was a guy on here that had a tuned S6 and found out that the dealer more than likely did not change all 8 plugs during service so a couple of the plugs went double change span. The plugs are irridium

[Avantly]

The sport diff fluid change isn't hard to do, but there have been several documented cases where dealers and independent shops managed to put the wrong fluid in the wrong chamber resulting in ATF in the gears and gear oil in the wet clutches... Replacement cost was insane. Despite the new replacement cost, used sport diffs continue to be (relatively) cheap and if you drive the car hard I'd be changing it sooner than 60k intervals IMO.

4.0T symptoms with worn plugs are quite interesting... On cold starts you can definitely tell when it's time to change them xD

[joe_momma]

Right on, thanks for the info. Honestly, I haven't pushed it hard at all - I've not even gone full throttle in it yet. Close, but not all the way. I legitimately don't trust the tires on it, and I don't want to be "that guy" that piles it up acting a fool with questionable rubber. PO was from what I can gather an older gent so it likely hasn't been driven terribly hard, outside of the rash on the wheels but that appears to be lack of parking lot ability. I'll see if I can find some video on the center/sport diff service. What about the front or rear diff - anything need to be done there?