systemctl --all|grep dbus
dbus.service              loaded active   running       D-Bus System Message Bus
dbus.socket               loaded active   running       D-Bus System Message Bus Socket

cat /lib/systemd/system/dbus.service
[Unit]
Description=D-Bus System Message Bus
Requires=dbus.socket
After=syslog.target

[Service]
ExecStartPre=/usr/bin/dbus-uuidgen --ensure
ExecStartPre=/bin/rm -f /var/run/dbus.pid
ExecStart=/usr/bin/dbus-daemon --system --address=systemd: --nofork --systemd-activation
ExecReload=/usr/bin/dbus-send --print-reply --system --type=method_call --dest=org.freedesktop.DBus / org.freedesktop.DBus.ReloadConfig
OOMScoreAdjust=-900

 cat /lib/systemd/system/dbus.socket
[Unit]
Description=D-Bus System Message Bus Socket

[Socket]
ListenStream=/var/run/dbus/system_bus_socket

cat /lib/systemd/system/dbus.target.wants/dbus.socket 
[Unit]
Description=D-Bus System Message Bus Socket

[Socket]
ListenStream=/var/run/dbus/system_bus_socket

[   29.780068] kdm[2116]: klauncher(2153) kdemain: No DBUS session-bus found. Check if you have started the DBUS server.
[   29.805133] kdm[2116]: kdeinit4: Communication error with launcher. Exiting!
[   29.807601] kdm[2116]: kdmgreet(2147)/kdecore (K*TimeZone*): KSystemTimeZones: ktimezoned initialize() D-Bus call failed:  "Not connected to D-Bus server"
[   29.807714] kdm[2116]: kdmgreet(2147)/kdecore (K*TimeZone*): No time zone information obtained from ktimezoned