I don't know what the owners manual says for the current production cars, but I think the Tesla website Model S description pages cover everything. [...]
In the Driver Assistance Features section of the latest owners manual (document date 10/28/15) for cars with v7.0 uses the following terminology:
(1) "... Model S vehicles
equipped with Driver Assistance components...", and
(2) "... Model S vehicles
equipped with the optional Autopilot Tech Package"
i.e. If I'm not mistaken, (1) means cars equipped with the AP
hardware, and (2) means cars with the optional add-on AP
software, aka "Autopilot Convenience Features option in the Design Studio.
Quote (bold emphasis mine):
"These safety features are available
on all Model S vehicles equipped with Driver Assistance components:
• Lane Assist (see Lane Assist on page 77).
• Collision Avoidance Assist (see Collision Avoidance Assistance on page 79).
• Speed Assist (see Speed Assist on page 82).
These convenience features, designed to reduce driver workload,
are available only if Model S is equipped with the optional Autopilot Tech Package:
• Traffic-Aware Cruise control (see Traffic-Aware Cruise Control on page 66).
• Autosteer (see Autosteer on page 71).
• Auto Lane Change (see Auto Lane Change on page 73)
• Autopark (see Autopark on page 75).
• Auto High Beam (see High Beam Headlights on page 50)."
That would not be my understanding. Lane assist and speed assist are clearly autopilot functions. I'm unclear on the collision avoidance assist. Certainly the AEB - automatic emergency breaking is a "non-autopilot" function.
Lane Assist as defined in the manual includes
• Lane Departure Warning
• Side Collision Warning
Unlike Autopilot functions like Autosteer, these are passive warnings only, so it makes sense they still can be included in cars without the optional full-AP package
Speed Assist is simply the forward-looking camera detecting speed limit signs and displaying the speed sign icon on the dashboard display and providing a warning if the limit is exceeded. So again this seems to be a passive driver assist, separate from any active control as part of the optional Autopilot package, or even basic dumb cruise control. As mentioned elsewhere, there's no mention at all in the owners manual about basic dumb cruise control.