Mercedes-Benz S-Class 2019 Operator's Manual page 93

After unlocking the vehicle using KEYLESS-
R
GO
Deactivating the ATA
Press the %, & or p button on the
#
SmartKey.
or
Press the start/stop button with the Smart‐
#
Key in the stowage compartment
( page 169)
→
Deactivating the alarm using KEYLESS-GO:
Grasp the outside door handle with the
#
SmartKey outside the vehicle.
91
Opening and closing