Mercedes-Benz R350/R400 Steering Wheel Multifunction Button Left A1648700558 Right A1648700658

This multi-function steering wheel button is designed for Mercedes R-Class R350 (2006-2012, 3.5L) and R400 (2013-2015, 3.0T); left and right buttons correspond to OEM numbers L:A1648700558 and R:A1648700658, also compatible with A1648700558/A1648700658 factory replacements. The button module controls audio, Bluetooth hands-free, and instrument cluster menu for hands-on control. Installation is medium difficulty; requires removing the steering wheel airbag module; professional technician recommended to avoid triggering safety systems. For B2B buyers, this part is a high-turnover wear item; left-right buttons often replaced in pairs to maintain feel.