Why is the keyless entry not working on the Mercedes-Benz E280?

[DiAmy]

There are two possible reasons why the keyless entry is not working on the Mercedes-Benz E280. The first is that the car battery is dead, and the second is that the key battery is dead. How the keyless entry system works: The ignition key contains a chip, and each chip has a fixed ID. The car can only start when the ID of the key chip matches the ID of the engine. If they do not match, the engine will not start. Function: When the key is near the car body, the doors automatically unlock and the anti-theft alarm is deactivated, while the turn signals flash twice. When the key moves away from the car body, the doors automatically lock and the anti-theft alarm is activated, with the turn signals flashing once and the horn sounding a short beep. Basic information: The car keyless entry system, abbreviated as PKE (PASSIVE-KEYLESS-ENTER), uses the world's most advanced RFID radio frequency technology and the most advanced vehicle identity coding recognition system.