"No signal change" (Изменение сигнала отсутствует), meaning the car's computer (often the Front SAM or COMAND/MBUX module) recognizes the button is physically depressed or electronically shorted and is no longer responding to new presses. Common Causes & Solutions
To resolve code B1E9E2A, a technician typically follows these steps: mercedesbenz b1e9e2a
This code essentially means your Mercedes has engaged its anti-theft protocol. When you insert the key (or push the start button), the car sends a signal to the key to verify it is the correct one. If the key does not respond, or if the signal is interrupted, the car sets code B1E9E2A and prevents the engine from running to protect against theft. or if the signal is interrupted