R60 radio issues
 

I've installed a pioneer dmh-c5500nex with a axxess autumn harness. But everytime i put the car on acc mode the radio goes on and then turns off after a few seconds. I took the voltage measurements on the red and yellow wires. The yellow has constant 12v but the red has 12v at the beginning and then goes to 0v hence why the radio shuts down.

Anyone knows how to fix this?