Should you have been working on the ignition important-lock or the ignition switch by itself you'll have inadvertantly tripped the steering lock (see pic. The ESL device is often removed without having eliminating the cluster as well as the steering wheel... When the wheel is unlocked. It can be accessed https://mercedes-m156-c63-cam-gea24062.59bloggers.com/28575188/how-mercedes-esl-can-save-you-time-stress-and-money