Adaptive cruise control not working

[bigcw]

Hi all

Just swapped my trusty A6 Le Mans for an RS6 V10.

However the adaptive cruise control doesn't want to work. It says 'ACC not available' whenever I hit the button. I know I have to be going over 19mph, but even at motorway speeds it still won't activate.

The manual says that this error will appear 'if, for example, the brakes are overheated'. Fat chance of that in this weather! I've been scared enough to put my foot down at all let alone give it enough beans to overheat the brakes.

It also says that 'ACC not available!' (ie the same message but with a ! on the end) means a system malfunction, but my message doesn't have the '!'.

The only other symptom is that the cruise control light comes up red during the self test at switch on. You know, when all the other lights flash on for a few seconds.

I'm not sure if it's supposed to flash red or if that indicates a fault. Can anyone with the ACC system confirm?

Assuming there is a problem, I guess my only option is to take it to Audi for a diagnostic check?

Cheers, Chris

 

[ex911driver]

Have a look on the vcds users map to see if there is anyone near to you that will scan it .

 

[bigcw]

I got it scanned at VASS-Tech in Whitchurch today. Apparently it's showing an error of the radar unit heater open circuit or shorted to ground, which proves that there is something wrong with it at least ie it's not just user error!

Now trying to find a dealership that has the correct tools to deal with it. Apparently it needs a radar alignment 'thing' in order to fix it.

Chris

 

[bigcw]

Seems the problem is with the heater in the radar sensor in the front bumper. Audi have ordered the part and the car is booked in on Friday. Fingers crossed that will solve it!

Chris

 

[bigcw]

Just in case anyone is interested, the replacement heater unit solved the problem. Replacement was just shy of £250 including the part and labour. They gave me the old one - it looks like it just unclips from the grille so if anyone experiences this in the future it's probably a DIY job to fix other than erasing the fault code.

Chris

 

[ex911driver]

Glad its sorted

 

[Aliosha]

Just in case anyone is interested, the replacement heater unit solved the problem. Replacement was just shy of £250 including the part and labour. They gave me the old one - it looks like it just unclips from the grille so if anyone experiences this in the future it's probably a DIY job to fix other than erasing the fault code.

Chris

In my A4 Avant the system's sensor is based on a laser (so is not really a "Radar" that is a "RAdio" Detection And Range). In this case, after the alert "ACC not available" the first thing to do is to clean the lens in front of the car. In my experience (after several mysterious "radar" faults and related repairs) this simply maintenance solve the problem (saving a lot of money).

 

[JoseLuis]

Just in case anyone is interested, the replacement heater unit solved the problem. Replacement was just shy of £250 including the part and labour. They gave me the old one - it looks like it just unclips from the grille so if anyone experiences this in the future it's probably a DIY job to fix other than erasing the fault code.

Chris

Hey Chris, Im glad I found your post. My S3 reports same problem. Now help me out explaining what is the "heater". Im doing mysefl this labor. There is a little sensor near the radar, is that one?
Thanks in advance for your reply. Can post a picture of heater?

Regards,

Jose

 

[RAF_S7]

Holy thread revival........

Anything to do with changing or adjusting the ACC sensors really needs to be done at the dealers, the alignment of the radar sensor is critical to safety and operation, and needs specialist alignment equipment.

You can install the replacement part, but dealer needs to align.

What year is your S7?

 

[JoseLuis]

Holy thread revival........

Anything to do with changing or adjusting the ACC sensors really needs to be done at the dealers, the alignment of the radar sensor is critical to safety and operation, and needs specialist alignment equipment.

You can install the replacement part, but dealer needs to align.

What year is your S7?

its a S3 2015

 

[RAF_S7]

Here is the Part list for the ACC.

The part is #1 on the diagram.

Has someone confirmed with Vagcom that the unit has failed?

http://www.oemepc.com/audi/part_sin.../907/subcategory/907005/part_id/270144/lang/e

 

[JoseLuis]

Here is the Part list for the ACC.

The part is #1 on the diagram.

Has someone confirmed with Vagcom that the unit has failed?

http://www.oemepc.com/audi/part_sin.../907/subcategory/907005/part_id/270144/lang/e

Thanks Raf, here I post my own VCDS report. Im not that experienced, I´ve got a used sensor from England, same code exactly. Not installed yet.
I took car to Audi dealer, but too much money before I give a try. My car still in warranty but since I used APR S2 and Armytrix they refused to service free in this área. Regular service free ok.
I guess you are able to help me out here.

Mileage: 18581km-11545miles
01-Engine -- Status: Malfunction 0010
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
13-Auto Dist. Reg -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
20-High Beam Assist. -- Status: OK 0000
22-AWD -- Status: OK 0000
2B-Steer. Col. Lock -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
A9-Struct. Borne Sound -- Status: OK 0000
BB-Door Rear Drv -- Status: OK 0000
BC-Door Rear Pass -- Status: OK 0000

Address 13: Auto Dist. Reg (J428) Labels: 5Q0-907-567.clb
Part No SW: 5Q0 907 567 N HW: 5Q0 907 567 M
Component: ACC3 H10 0400
Serial number: 18111403072735
Coding: 003E1301FE0309
Shop #: WSC 06385 790 00016
ASAM Dataset: EV_ACCBoschMQB 001024
ROD: EV_ACCBoschMQB_AU37.rod
VCID: 4683303DF9767E71B5-8012
2 Faults Found:
0113 - Deactivation after Multiple Emergency Brake Activations
C1143 F0 [047] - Unknown Error Elaboration
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 19
Mileage: 18555 km
Date: 2017.02.25
Time: 15:51:09
Control Module temperature: 34 °C
Voltage terminal 15: 11.9 V
Vehicle speed: 0.00 m/s
Acceleration: 0.00 m/s²
1117 - Automatic Distance Control
B10E7 F0 [047] - Disconnected
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 6
Fault Frequency: 29
Reset counter: 22
Mileage: 18555 km
Date: 2017.02.25
Time: 15:51:06
Control Module temperature: 34 °C
Voltage terminal 15: 11.9 V
Vehicle speed: 0.00 m/s
Acceleration: 0.00 m/s²

 

[RAF_S7]

Sounds like the car has been tagged TD1 - no transmission or engine warranty because of the APR Stage 2, however this should not be impacting on them resolving a fault with ACC, since thats not transmission of engine related.

I would be going back to the dealer, or changing dealers if possible.

Even if you change the part, you will still need to get the dealer to carry out alignment and calibration of the ACC, so although you may save some money in fitting the part, you are likely to still have errors until the calibration is carried out.

On your Vagcom Log, this entry at 0113 - Deactivation after Multiple Emergency Brake Activations could be the cause of the problem.

Check out this forum discussion here

It is in French - but you can use Google Translate if needed here

The important information is that unless you reset 0113, ACC will never work. The french forum entry tells you how to reset this using VCDS.

 

[RAF_S7]

Ive also found similar thread in English here

 

[JoseLuis]

Thanks RAF, I did it and will wait for error go away tomorrow or next days. Pretty similar or same situation both blogs cases. I will let you know and you are right if I push dealer or visit another one.
Regards

 

[JoseLuis]

Well, I changed sensor, calibrated with Vernier bolts as old sensor was and click on Go! in VCDS in 113 - Deactivation after Multiple Emergency Brake Activations and not fixed. Still ACC Unavailable.
Keeping research...

 

[RAF_S7]

Resetting the emergency brake activations should have reset the counter and cleared that fault code. I don't know what else to suggest, sorry.

Sounds like you need a trip to the dealer