SC-901 press-and-hold combinations
 

The SC-901 audio system in my 1999 C70 has some button-combinations, which are not all documented in the user's manual.

I'm talking about the ones where you switch off the radio, press and hold a button and then switch the unit back on, giving you access to certain settings.

I know the following:

1 - toggle speed driven volume adjustment
2 - custom equalizer
5 - locality setting

I tried the same with 3, but it gave some weird beep and the whole display came up (all icons).

Does anybody know what happens when you use 3, 4 and 6? I don't want to reset (or lock) everything accidentally (I don't know the radio unlock code).

none of them will lock the deck
 

I've tried all button combinations and none of them locked the deck, so no worries.

4 will tell you the version of your software(which I wish said 2 on mine so it could read CDrs)

6 i dont remember right now.

If anyone figures out a way around the CDr issue please share I'm damn interested in that.