236 Driving and operatingStow/hide coupling ball barPull the grip located left of the numberplate under the rear bumper fascia atan angle of approx. 45° to the ground.A buzzing tone sounds as a warningwhen the release handle is pulled outand the ball neck is disengaged.With the flat of the hand, swivel thereleased coupling ball bar to the rightuntil it engages under the floor. Makesure that the release handle is back inits hidden initial position, otherwisethe buzzing tone will not stop.9 WarningTowing a trailer is permitted onlywhen the coupling ball bar is fittedcorrectly. If the coupling ball bardoes not engage correctly or if therelease handle is impossible toguide to its hidden initial position inthe housing or if the buzzing tonesounds after engaging thecoupling ball bar, seek theassistance of a workshop.Eye for break-away stopping cableAttach break-away stopping cable toeye.Trailer stability assistIf the system detects snakingmovements, engine power is reducedand the vehicle/trailer combination isselectively braked until the snakingceases. While the system is workingkeep steering wheel as still aspossible.Trailer stability assistant is a functionof the Electronic Stability Control3 182.
