Check Electrical Wiring Harness In Steering Wheel - AR82.90-P-0101-01FRD

Model 206, 213, 223, 238, 257, 295, 297 

with code L5C (Supersport steering wheel - leather deep-embossed) 

Courtesy of MERCEDES-BENZ USA

Line routing shown with code 266 (Distronic Plus cross-traffic support (DTR+Q)) 

1. Check for correct seating of electrical wiring harness (arrows) in steering wheel.