Is there supposed to be a switched 12v supply in the ISO connectors?

[Bonbon]

Am I going crazy? I’m replacing the HU in my son's car with something more contemporary than factory (a JVC KW-M560BT).
I’ve had a poke around the ISO connectors in the car with my multi meter, and there doesn’t seem to be a switched 12v supply there.
Is this to be expected and do I need to run a line from the fuse box or something?

Thank sin Advance!

 

[Sharmzyy1.9]

Am I going crazy? I’m replacing the HU in my son's car with something more contemporary than factory (a JVC KW-M560BT).
I’ve had a poke around the ISO connectors in the car with my multi meter, and there doesn’t seem to be a switched 12v supply there.
Is this to be expected and do I need to run a line from the fuse box or something?

Thank sin Advance!

Hello, yes there is one. If you have the standard radio, it will be the wire marked S-Kontakt or S-Line or S-Kon. In both my mk4 Ibiza Cupra and my Polo 9n3 these wires are black with a red stripe. You will get 12v when you turn the key in the ignition and it will turn off when you pull your keys out of the ignition.