This is the interface that I bought which has a red wire for the switched 12 volt so I hooked that up but it still turns the radio on even when the key is out.

 

Evidently you wired it in wrong or someway didn't follow directions. My guess is you got 2 wires reversed.

 

The radio will stay on for 10 minutes after key is turned off, even key out. Or until the driver side door is opened, whichever comes first. This is Retained Accessory Power(RAP). If you are experiencing something different, then you have a problem. Just Fyi...

Sounds like this is not what you're experiencing.

 

You can wire a manual switch to turn the radio on or find an ignition switched wire to tap off of for the red wire on the new head unit which will make it turn on only when the ignition is on (drains a lot of power when you just want some music - not recommended)

I don't miss the annoying chimes one bit. I don't find it tedious to flip a switch when I want the head unit on or off.

Just depends which you prefer. Lots of options for switch placement.

 

Do you know the correct way to hook it up it came with no directions

 

You could Google the model number, look for a manual

 

Similar to this


https://metradealer.com/files/aswc/ASWC-1_INST_22.pdf

 

I've worked with electronics for almost 50 years, I have programmed PLCs and robots, build Arduino projects, design circuits and am employed as an industrial electrician.

That said, I would NEVER try to splice into the wiring in any post-2000 car. If it has an OBD II port, it's got some sort of CAN bus. Just spend the money and get the proper adapter and wire it according to the directions. Even with my background, I am not vain enough to think I know better than the engineers who designed newer car electrical systems. It's all interconnected, and chopping away is generally just going to make things worse rather than better.

 

That's very good advice for people who don't know how to wire a head unit to turn off with ignition.

 

You didn't acknowledge comment 43. Just checking if you understand that the radio is supposed to stay on as described there.