I'm going a bit from memory and experimentation years ago when I encountered a problem , but because A01 cars have more complex wiring and routing there are the two different systems.
A01 includes map light, trunk light, glove box, ashtray light, ignition light and more.
Can also be combined and we're talking 1970 only here, with optional headlight time delay.
There was a thread years ago on here about 15 pages, that addressed a lot of this and more.