Tire pressure sensor
A69/1 — Tire pressure sensor (TPM) left front wheel
A69/2 — Right front wheel TPM sensor
A69/3 — Left rear wheel TPM sensor
A69/4 — Right rear wheel TPM sensor
Tire Pressure Sensor Antenna
A2/44 — Left front wheel TPM sensor antenna
A2/45 — Right front wheel TPM sensor antenna
A2/46 — Left rear wheel TRM sensor antenna
A2/47 — Right rear wheel TPM sensor antenna
(Article borrowed from the web portal MercedesMan.ru)
Sensor A54/1 right and right side airbags (under the back seat on the right)
Sensor A53/1 left and left side airbags (under the rear seat on the left)
Sensor S42 liquid level I windshield washer reservoir
The location of the safety system sensors and the location of the windshield washer fluid level sensor are shown in the illustrations.