This week, I noticed that I hadn’t noticed the blind spot assist flashing in for a while. So, I delved into the settings menu through the steering wheel and turned it on, along with the rear traffic warning system. 
 

The blind spot monitoring lights in the mirrors lit up and worked perfectly for the remainder of my journey. When I arrived at work ans put the car into reverse, a warning message flashed on the dash saying they were unavailable and when I went back into the settings the boxes were unticked. 
 

This is happening every time I put the car in reverse meaning I have to turn both on for every journey. It’s nothing to do with the personalisation feature as I only use one key and it always recognises it when I get in the car. 
 

Has anyone experienced this before and is there anything I can do to resolve it?

 

Fortunately for you it seems it still works when you tick boxes.

 

What you describe, correspond to the standard behavior when towing (blind spot and rear traffic are deactivated).

Therefore I would suggest to check the electric plug of your trailer (if you have one).

 

 

Edited 26 June, 20214 yr by Bap33

I don’t have a trailer but my car did come with the tow hitch. I’ll investigate and see if there is a setting which I’ve inadvertently changed. 

7 hours ago, Bap33 said:

Therefore I would suggest to check the electric plug of your trailer

Sorry I was meaning the towing hitch indeed. I made a bad translation.

I’ve tried the towing hitch and it seems to be stowed properly so I don’t think it’s that. 
 

I am now not sure if it is putting it in reverse which causes the issue as it has turned itself off twice today when I’ve been driving forward. Then it remained on for my 30 minute drive home with no issue and remained on when I backed onto the driveway. I’m at a bit of a loss. 
 

My car did have some repair work done in front of the rear wheel arch a few weeks back. I don’t know if they removed the rear bumper (not sure why they would ) but could this cause issues?

32 minutes ago, bigman1976 said:

I’ve tried the towing hitch and it seems to be stowed properly

Not the ball hitch; muck in the electrics plug senting a false signal that there's a trailer in tow.