Car: 2008 1.8 5 door, Galaxy Grey
Join Date: 1st May 2012
Location: Wokingham, UK
Thanked 48 Times in 45 Posts
Sounds like they were fitted but when the reverse camera was fitted they were disconnected. The sensors were probably left in the bumper otherwise the bumper would have needed repairing or replacing.
I think there should be a control module up behind the panel you mentioned for the sensors but it sounds like that may have been removed as well if there is only a wire. I guess you could get hold of a new module, speaker and wiring and retrofit but if the camera works OK then just use that.