When does the 2 rear antennas on a 93 500SEL supposted to go up? What is it for? New to this car. Don't know much about them. Thanks for any help.

Mike

 

The two smallchrome rods that look like antennas, are extended from the left and right rear fenders as backup assist/parking locators so you can see the edges of the fenders when backing. They only extend when in reverse gear and retrack back into the fender when not in reverse gear. If they do not extend or retrack, thenit is avacuum actuation problem, but check all the vacuum lines and PSE pump first.