Radar Sensor Error?
Thread Starter
Member
Joined: Feb 2021
Posts: 204
Likes: 52
From: Lower Westchester, NY
2018 s560v4
Radar Sensor Error?
I keep getting the following three messages on my dash during my drives:
Brake Assist Limited
Blind Spot Assist Inoperative
Lane Keeping Assist Inoperative
Once the engine is turned off and restarted, these messages are gone but only to return within a few minutes.
My Xentry program is stating:
Left Rear outer short range radar (NBR-LR)- Communications with the rear radar CAN bus has a malfunction. Bus OFF
and
Mercedes-Benz Intelligent Drive (SG-FAS)- The radar senor 8 has a malfuntion.
Both messages are not a Current Fault (F), just informative (i).
I want the dealer to fix but know that they most likely won't because its not a current Fault (F). They will just clear the errors and give me the car back.
Any ideas?
Brake Assist Limited
Blind Spot Assist Inoperative
Lane Keeping Assist Inoperative
Once the engine is turned off and restarted, these messages are gone but only to return within a few minutes.
My Xentry program is stating:
Left Rear outer short range radar (NBR-LR)- Communications with the rear radar CAN bus has a malfunction. Bus OFF
and
Mercedes-Benz Intelligent Drive (SG-FAS)- The radar senor 8 has a malfuntion.
Both messages are not a Current Fault (F), just informative (i).
I want the dealer to fix but know that they most likely won't because its not a current Fault (F). They will just clear the errors and give me the car back.
Any ideas?
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I'd guess the "radar sensor 8" or the related wiring is causing these issues. A bad AUX battery does disable some features, cannot remember which exactly but should not affect all that were mentioned on the opening message.
A bad main battery should not cause issues as long as the car starts. Some high current consumption features may be switched off for a short time. Since the alternator is running, the main battery voltage reaches sufficient level quickly and after that seat heaters etc. would work fine. Drive assist features are not turned off at any decent main battery level. A different thing if the alternator is dead and the main battery voltage keeps dropping.
A bad main battery should not cause issues as long as the car starts. Some high current consumption features may be switched off for a short time. Since the alternator is running, the main battery voltage reaches sufficient level quickly and after that seat heaters etc. would work fine. Drive assist features are not turned off at any decent main battery level. A different thing if the alternator is dead and the main battery voltage keeps dropping.
Thread Starter
Member
Joined: Feb 2021
Posts: 204
Likes: 52
From: Lower Westchester, NY
2018 s560v4
I'd guess the "radar sensor 8" or the related wiring is causing these issues. A bad AUX battery does disable some features, cannot remember which exactly but should not affect all that were mentioned on the opening message.
A bad main battery should not cause issues as long as the car starts. Some high current consumption features may be switched off for a short time. Since the alternator is running, the main battery voltage reaches sufficient level quickly and after that seat heaters etc. would work fine. Drive assist features are not turned off at any decent main battery level. A different thing if the alternator is dead and the main battery voltage keeps dropping.
A bad main battery should not cause issues as long as the car starts. Some high current consumption features may be switched off for a short time. Since the alternator is running, the main battery voltage reaches sufficient level quickly and after that seat heaters etc. would work fine. Drive assist features are not turned off at any decent main battery level. A different thing if the alternator is dead and the main battery voltage keeps dropping.
To clarify, the dealer replaced the AUX battery nine months ago and I replace the main (62lb) battery last month.
