RAM 1500 Owner's Manual page 28

26 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
Push and release the LOCK button on the RKE transmit-
ter to lock all doors, the tailgate and the RamBox (if
equipped). The turn signal lights will flash and the horn
will chirp to acknowledge the signal.
NOTE: Inserting the Key Fob with RKE transmitter into
the ignition switch disables the system from responding
to any button pushes from that RKE transmitter. Driving
at speeds 5 mph (8 km/h) and above disables the system
from responding to all RKE transmitter buttons for all
RKE transmitters.
Key Fob With Remote Keyless Entry (RKE) Transmitter
(IGNM)