ACC Unavailable + Brake assist issue

[Dnovakovic04]

I've been having some issues with my adaptive cruise control as well as my brake guard.

1 - as soon as I start driving, I'll get a notification on my dash saying "brake guard off". (This has never been like this and the brake assist is on through my MMI.

2 - if I try to turn on cruise control, it shows "ACC Unavailable".

I've checked the sensor up front and everything looks to be fine. I'd prefer to avoid the crazy dealership fees they have for trouble shooting this but I have no idea what to look at or test.

Anybody have any ideas?


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[pierreb]

Scan the car for codes.

[Dnovakovic04]

Scan the car for codes.

I have and nothing comes up. I've had no codes mentioning anything.


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[bluefox280]

I have and nothing comes up. I've had no codes mentioning anything.

Was that scan with a VAG-COM / VCDS?

- Erik

[Dnovakovic04]

Was that scan with a VAG-COM / VCDS?

- Erik

No, I'll do that and see what comes up. But I had it scanned with my buddies scanner and I had a lot of codes come up, but you think it wouldn't come up unless using a vcds cable.


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[bluefox280]

No, I'll do that and see what comes up.

Yes, grab the WHOLE auto-scan and report back.

But I had it scanned with my buddies scanner and I had a lot of codes come up...

Anything related to you ESP / traction control?

Also, has any of the following occurred:
* windshield replacement?
* removal of radar sensor connectors?
* mis-alignment of radar sensor?

- Erik

[Dnovakovic04]

Yes, grab the WHOLE auto-scan and report back.


Anything related to you ESP / traction control?

Also, has any of the following occurred:
* windshield replacement?
* removal of radar sensor connectors?
* mis-alignment of radar sensor?

- Erik

I appreciate the help! I'm going to try and scan this weekend as my buddy has the cable.
No replacement, no sensor issues.

I've never touched anything around the sensor.


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[bluefox280]

I appreciate the help!

Was the deactivation of the ACC & brake guard tied to any specific event or moment?
Again, just trying to gain, if any, details on when the ACC & brake guard were lost and see if there's any correlation.

- Erik

[Dnovakovic04]

Was the deactivation of the ACC & brake guard tied to any specific event or moment?
Again, just trying to gain, if any, details on when the ACC & brake guard were lost and see if there's any correlation.

- Erik

Yeah I'm just as confused man. One day I turned on my car and it started happening.
Now every time I turn my car on and start driving the brake guard off message comes on. And if I try to turn on cruise control, the error message comes on.

I have a radar detector. Passport 9500. Would that have anything to do with the sensor?
I have it powered into the fuse box.


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[S4FUNN]

was there a resolution ? I am having the same issue in 2018 RS3--
I had moved sensor to install new IC. Worked fine for a month, then came up while driving, cut in , cut out- and then , it will not come back up.

[flowhigh]

was there a resolution ? I am having the same issue in 2018 RS3--
I had moved sensor to install new IC. Worked fine for a month, then came up while driving, cut in , cut out- and then , it will not come back up.

You're AZ member #201? Try the A3/S3/RS3 forum too.