i think the OP is over analyzing this too much...or not clearly stating what
the problem is. all cars have the ability to run limited appliances or circuits
even with key off/out.

so to the OP, what are you wanting to do...or....what is it you feel is not
functioning properly?

with the 210, the radio, windows, int/ext lights, roof, seats, residual heat/
fan..... can be activated when engine is off/key out.

__________________
-- raymond~
47º 34'N 122º 18'W