turn off headunit with alarm

No trick, just separate your Sony red and yellow as explained above yours ONCE AGAIN isn't wired correctly. Ref. window and roof close. If it's possible extend your lock wire from the alarm to about 15 seconds that will give you window and roof (if factory)close.

You could use the unlock output from your alarm to supply power to your head unit's red wire and the lock output from your alarm to kill power using the following relay setup. the12volt • Support the12volt.com

He will have to pulse that setup with (-) to turn it on. Maybe the Retained Accessory relay setup can be used instead.

Hi.I connected it like you have it in pic with the 3relays.the headunit only lights when disarming for one second and dies again,1st and 2nd relay clicks when disarming.it doesn't stay on inorder to shut off when you arm.relay 3 doesn't click at all.I changed relays but still no luck.lock/green wire is connected as turn of and.blue/unlock is connected as turn onMr signal

Appologies guys,I got it right it was a wire problem.thanks to the guy with the diagram it worked perfectly.thumbs up to this site wowMr signal

I guess it helps if I do not just look at the pictures.

Or none of the above Craig if the radio was wired correctly in the first place.