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His initial system for sale only worked on Honda with HondaSense (lane keeping) if I recall correctly. Likely tapping into those control systems to operate steering, accelerator, and brakes.
A pre autopilot car wouldn't have any mechanism for the self driving software, even with a radar added, to actually operate steering, brakes, etc.
Brakes need to be changed, but not steering. When wk057 retrofitted AP1 into his SO's car he made a parts list and it didn't include an updated steering system so I asked him about that; he said the pre-AP steering can be controlled already over CAN. It's the same steering in non-AP and AP cars!
I see at least a few Pre-AP Model S drivers have successfully installed openpilot in their cars (I've seen some clips on YouTube). Hoping at least one of them is active on this forum and would care to share their first hand experience?