I have just tested it, and it works well.
Experiment:
- V2.4 firmware
- bott delay off
- 12.35 V power supply
- HK3
- parking enable event detection, no timer (so jumps to parking with no time).
- Disconnect ACC
- The camera turns to parking mode
- After 1 minute the camera turns off.
- Change the HK3 to 11.8V
- nothing happens
- connect ACC
- The camera turns on.
- Disconnect ACC
- The camera turns to parking mode.
- No problem after 10 minutes...
of course, the power cable was in the camera no in the GPS. At least mine works, I don't know what could be the problem, in theory, if the only problem is when tension is too low the camera should turn on in the moment you connect the ACC cable, regardless if the tension is low or not. In my case it turns off but just when I connect the ACC it start recording as usual (no parking mode) even with low tension (yes I also make this experiment). So I guess the low tension protection is only for Battery cable.