Mercedes-Benz is recalling about 700 2016-2017 S63 AMG Coupes, S65 AMG Coupes, S550 Coupe 4Matics, S63 AMG 4Matic Convertibles, and S550 Convertibles manufactured June 29, 2015, to March 15, 2016, due to their seat belt extenders not retracting as intended leaving the possibility of their malfunction in the event of a crash.
If the seat belt extender does not retract and/or the extender breaks, the seat occupant may not be properly restrained, increasing the risk of injury.
MBUSA will notify owners, and dealers will update the control unit software, free of charge. The recall is expected to begin in mid-December 2016.
Owners may contact MBUSA customer service at 1-800-367-6372.