andonevris

Exactly my thinking, seems too coincidental. I'll post up once I get to the bottom of it in case it helps anyone else in the future

Jack88

I thought the bit behind the rear view did play a part in ACC, but to what extent I can't seem to find. None of the literature breaks it down into what part each component plays. You might just be able to ask a dealer if replacing the windshield could cause your problem. They may answer without needing to see the car.

derfA8L

Here's a tech description of the A8's ACC system. While it primary uses the two radar sensors in the lower front grill sections, it also relies on a number of the car's other systems, so perhaps the camera in the rear view mirror comes into play also. The 2011 owner's manual shows the adaptive lane assist using that camera, while it also shows ACC using the two grill radar sensors...but perhaps there is some sharing going on.


cruise control with stop & go function

The central element of the Audi driver assistance systems is the adaptive cruise control with stop & go function, an automatic distance control system. The system, which is available in a number of larger models, regulates the speed and the interval to the vehicle ahead by automatically accelerating and braking in a speed range of 0 to 250 km/h (0 – 155.34 mph).

The ACC stop & go uses two radar sensors installed at the front of the vehicle which are automatically heated when it is cold. They transmit radar waves at a frequency of 76.5 gigahertz covering a roughly 40 degree wedge-shaped field measuring approx. 250 meters (820 ft) in length. A computer processes the signals and thus detects vehicles ahead.

The driver can influence the function of the ACC stop & go; the interval to the vehicle ahead and the control system dynamics are adjustable in steps. The system accelerates smoothly or sharply, depending on the setting. Deceleration is limited to roughly 4 m/s2 (13.12 ft/s²), which is a good third of what is possible. In stop-and-go traffic, the ACC stop & go automatically slows the car to a stop. After a brief stop, the vehicle moves off again automatically and follows the vehicle ahead. After a longer stop, the driver must tap the accelerator or the cruise-control lever.

The adaptive cruise control with stop & go function is a highly intelligent system – thanks to its broad networking. It works closely together with other driver information systems, and each of them contributes its own specific strengths. All told, the ACC stop & go in the Audi A8 takes data from around 30 control units, with which it works to continuously analyze the complete area around the vehicle. This expanse of knowledge enables the system to recognize complex scenarios and predictively support the driver. Because it also cooperates with the navigation system, it knows the course of the selected route in advance and can also compute the lane in curves, for example.

The ACC stop & go uses its networked knowledge in numerous situations. Whether quickly passing a car turning right from an interurban road or if another vehicle pulls into the lane occupied by the vehicle on the highway, the system handles many situations with the reflection and composure of a skilled driver, making driving even more fluid and harmonious.

Audi offers the adaptive cruise control in a number of different versions, with and without stop & go function, depending on the model series. The function of the individual versions varies slightly due to the different degrees of networking and the expansion levels.

andonevris

Thanks for that info derfA8L. 30 control units for the ACC!!

I have spoken to Audi to see if the screen change could affect the ACC, they said it's possible but need the car in to give me a definitive answer. i.e. "get your wallet out sir"

derfA8L

I'd have a chat with your insurance company. Since they refused you the ability to get the windscreen work done at an Audi dealer, I'd put them on notice that they may have to reimburse you for the cost of diagnostics and recoding IF it's determined that is the issue---in as much as the repair to your car was incomplete and could not be adequately accomplished by the insurance company's approved independent glass shop. Keep the records of your communications with the approved shop where they say they have so much experience working on these cars and disavow that their work caused the problem with the ACC system.

andonevris

I think it's a logical next step. To be fair my insurers are pretty good and I've been with them for nearly 20 years without a claim, apart from a couple of glass claims, hopefully they'll play ball.

Jack88

Insurance companies are always good when you don't make claims.

andrewmr

I'd get the guys that did the glass replacement involved once the dealer says it's related to the windshield.

derfA8L

Totally disagree, respectfully. These are the same guys that gave the OP a line of BS, denying responsibility...and they clearly haven't a clue. Once the dealer has the car hooked up to the diagnostics equipment they can address any recoding or realignment issues in the moment. It won't be inexpensive, but it will (should) be corrected IF that is the issue. I've previously discussed this topic with my dealer's service manager and he confirmed that there is some realignment/recoding that needs to be done when replacing a windshield on an A8 (and now also on other models). That's my opinion, anyway.

triniexr

Just out of curiosity, whats the price difference between the dealership vs the private guys?

When I used to work at a dealership people would bring their vehicles in for glass replacement but it was outsourced to a private guy. Only thing was that the glass was an OEM piece not a knock off.