The PathfindIR cameras(newer ones, digital comms) are so heavily controlled and locked down in both hardware and firmware that they're basically a paperweight without the rest of the car's guts(matching ECU, matching camera control box, matching phase of the moon).
The documents regarding their interface and protection against outside use are heavily guarded.
Good luck to you, but I doubt you will ever find any documents.
Also, chances are if you've sent some commands to the camera it's already bricked due to the anti-tampering measures(mentioned somewhere in another thread in this subforum).