Function of the immobilizer The immobilizer prevents your vehicle from being started without the correct SmartKey. The immobilizer is automatically activated when the ignition is switched off and deactivated when the ignition is switched on. When leaving the vehicle, always take the Smart‐ Key with you and lock the vehicle. Anyone can start the engine if a valid SmartKey has been left inside the vehicle. In the event the engine cannot be started (yet the vehicle's starter battery is charged), the system is not operational. Contact an authorized Mercedes-Benz Center or call 1-800-FOR-MERCedes (in the USA) or 1-800-387-0100 (in Canada). ATA (anti-theft alarm system) Function of the ATA system If the ATA system is armed, a visual and audible alarm is triggered in the following situations:
The ATA system is armed automatically after approximately ten seconds in the following situations:
Indicator lamp 1 flashes when the ATA system is armed. The ATA system is deactivated automatically in the following situations:
When the Mercedes‑Benz emergency call system is active and the alarm stays on for more than 30 seconds, a message is automatically sent to the Customer Assistance Center. Deactivating the ATA
Deactivating the alarm using KEYLESS-GO:
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Mercedes-Benz C-Class (W205) 2015 - 2021 Owners Manual > Voice Control System: Essential voice commands
Overview of switch voice commands Switch voice commands can be used to open certain applications. The voice command selection can be used regardless of the application that is currently active. Switch voice commands Voice command Function Navigation To switch to navigation mode Map To switch to map ...