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      01-14-2022, 06:23 AM   #1
Ole 530dA
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ACC sensor fault "Lack of visability"

Hello

I have a 2017 G31 which have ACC (Active Cruise Control). But i have had problems for a while now. It started when i suddently got a fault message, when drivning, that the front collision warning failed. A long came other fault messages from side collision and so on. I had a guy check fault codes with ISTA+ and found out that the car didnīt have contact with the ACC-sensor in front. I checked the harness for damage but nothing to see. Then i bought a used ACC-sensor. It has the same code/serialnumber as my old one. The "new" ACC-sensor were installed and coded/connected to my car. Then i had to get it calibrated by BMW. This also went well. The car is connected to the sensor and calibration also went well. But as soon as the car drives, then all the faults come back. BMW tried to remove the number plate and the plate behind in case it disturbs the "view". But also without any result.

Has anyone from here experienced this kind of fault? BMW tells me that they get fault text "Lack of visabilty" on the sensor.
Now they want to change the plastic shield in front of the sensor. The old one is not damaged od in poor conditions at all.
Hope to hear from someone who perhabs have a solution to this.
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      01-14-2022, 07:10 AM   #2
Joe-BMW33
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Are you getting any KFAS errors in ISTA?
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      01-14-2022, 09:34 AM   #3
Ole 530dA
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Quote:
Originally Posted by Joe-BMW33 View Post
Are you getting any KFAS errors in ISTA?
I donīt know. I donīt use ISTA. I could not get the BMW-guy to give me any error-codes. He only told me that he got text "Lack of visability". If he had a error code or not, I do not know. Sadly :-(
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      01-14-2022, 02:37 PM   #4
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Quote:
Originally Posted by Ole 530dA View Post
I donīt know. I donīt use ISTA. I could not get the BMW-guy to give me any error-codes. He only told me that he got text "Lack of visability". If he had a error code or not, I do not know. Sadly :-(
There is a bulletin out about KFAS camera failures and replacements. Your dealer should have it. Here it is.
Attached Images
File Type: pdf KAFAS Service Bulletin.pdf (124.1 KB, 892 views)
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      01-17-2022, 04:17 AM   #5
Ole 530dA
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Quote:
Originally Posted by Joe-BMW33 View Post
There is a bulletin out about KFAS camera failures and replacements. Your dealer should have it. Here it is.
Can it be the KFAS-camera when i get this message? It says it is the front radar field.
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      01-17-2022, 06:31 AM   #6
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Quote:
Originally Posted by Ole 530dA View Post
Quote:
Originally Posted by Joe-BMW33 View Post
There is a bulletin out about KFAS camera failures and replacements. Your dealer should have it. Here it is.
Can it be the KFAS-camera when i get this message? It says it is the front radar field.
Attachment 2790250
I'm honestly not sure. I was troubleshooting anti dazzle and VLD and came across this SIB. I didn't not have messages on the display, but the faults were in ISTA.
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      01-17-2022, 10:08 AM   #7
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In your original post, you indicated that you have gotten messages that both the front and side sensors are failing. To me, that suggests that the problem is not with the sensors but with either the wiring or the computer that the sensors use. Replacing one sensor seems senseless (pun intended).
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      01-20-2022, 10:06 AM   #8
Ole 530dA
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Hello

Yesterday i drove the car to my buddy who works a bit with ISTA+. And he read out this Fault. 48214A Lack of visabilty.
The radar/sensor is calibrated and the car seemes ok until i begin to drive. Then the message above appears on the screen. Next week i am going to BMW workshop and their next move is to change the plastic cover in front of the radar/sensor. But honestly i donīt think the cover is the problem. But again i donīt what next to do. Other than to buy a radar again. Itīs beginning to be expensive
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      01-26-2022, 05:48 PM   #9
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I have the same problem, flased kafas and acc to 2021 istep, still the same. Will remove bumper and kafas tommorow to chech acc sensor wireing
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      01-28-2022, 11:56 AM   #10
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Quote:
Originally Posted by mrgicm View Post
I have the same problem, flased kafas and acc to 2021 istep, still the same. Will remove bumper and kafas tommorow to chech acc sensor wireing
I have the same problem too.. You found something or still the same error?
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      01-30-2022, 06:30 PM   #11
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Yes, looks like the ACC heater inside the plastic cover is not working so ordered a new one.
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      02-01-2022, 02:47 AM   #12
Ole 530dA
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Hi

I have just bought my second used ACC-sensor. I hope this will work. The first one i bought kept failing. I donīt know if it is the heater that doesnīt work.
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      04-28-2022, 08:40 PM   #13
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any update

Ole,I have same problem, do you have any update for this issue?
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      05-06-2022, 01:52 AM   #14
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problem solved

I purchased a second hand acc radar sensor with part no 66316891746 (300USD) which is newer model than original one (66316888029), and installed coded, and calibrated by myself with a 50cm*50cm mirror, it is fullly functional now.

G30 radar sensor can be one of following model:

66316899921
66316892575
66316891746
66316888029
66316886324

I also updated the related Ecu software (FRR2, ICam3,SAS, KAFAS4 and body GW2) to get better ADAS experience, the software was updated with E-sys while engine was running, no battery charger is needed.
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      11-13-2022, 10:41 AM   #15
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Same problem here. Looks like a common one.
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      12-15-2022, 04:11 PM   #16
matros43
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Quote:
Originally Posted by Ole 530dA View Post
Hello

I have a 2017 G31 which have ACC (Active Cruise Control). But i have had problems for a while now. It started when i suddently got a fault message, when drivning, that the front collision warning failed. A long came other fault messages from side collision and so on. I had a guy check fault codes with ISTA+ and found out that the car didnīt have contact with the ACC-sensor in front. I checked the harness for damage but nothing to see. Then i bought a used ACC-sensor. It has the same code/serialnumber as my old one. The "new" ACC-sensor were installed and coded/connected to my car. Then i had to get it calibrated by BMW. This also went well. The car is connected to the sensor and calibration also went well. But as soon as the car drives, then all the faults come back. BMW tried to remove the number plate and the plate behind in case it disturbs the "view". But also without any result.

Has anyone from here experienced this kind of fault? BMW tells me that they get fault text "Lack of visabilty" on the sensor.
Now they want to change the plastic shield in front of the sensor. The old one is not damaged od in poor conditions at all.
Hope to hear from someone who perhabs have a solution to this.
Hello!
I have a G31 car. Same problem with ACC as you. Can you tell me how your problem was solved? You changed the radar cover and everything is fine now?
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      12-29-2022, 04:15 AM   #17
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I have the same issues. Can you please write back and let us know how you fixed?
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      01-01-2023, 04:22 PM   #18
mrgicm
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In my case the radar cover which has the impemented heater was broken, i ordered a new cover and problem was gone.
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      05-28-2023, 12:51 PM   #19
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Quote:
Originally Posted by davidlol View Post
I purchased a second hand acc radar sensor with part no 66316891746 (300USD) which is newer model than original one (66316888029), and installed coded, and calibrated by myself with a 50cm*50cm mirror, it is fullly functional now.

G30 radar sensor can be one of following model:

66316899921
66316892575
66316891746
66316888029
66316886324

I also updated the related Ecu software (FRR2, ICam3,SAS, KAFAS4 and body GW2) to get better ADAS experience, the software was updated with E-sys while engine was running, no battery charger is needed.
Hello
Same problem with my retrofitted ACC radar - "Lack of visibility". *029 model. Do you have any idea why it did not work in your case? Was it just a broken radar? Did you replace the radome also?
Thanks bro.
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