Using ALP Radio Mute and Control Functions

[Redmoto]

3 second NC relay triggered on blue wire. Design ver1, see photo below. * means set at 3sec.
Ignore cb/ck, this is on the relay, must be Chinese for nc/no.
How does this work?
0sec relay triggers in sequence with blue wire trigger, allowing relay3(black) to switch from 87a to 87 instantly.
3sec relay does nothing until 3sec is up then it takes power away from 0sec relay allowing relay3 to switch back to home position or from 87 to 87a
When trigger event is over the whole system miraculously resets.
Note come to find out this only works with engine running.
Blue wire before trigger 13.4v
Blue wire during trigger 4.4v
Trigger lasts for 5sec hence if 5sec is desired don't need 3 relays, could work with 1 relay.