Radio On Til Door Open Problem

Hi I attempted the Radio on til door open today but I ran into a problem. I wired everything correctly but iv determined that supposivly the door trigger is - and is color coded RED / white in the drivers kick panel. But after testing it that wire is constantly a ground. I tested this by connecting a meter to a constant 12 volt sorce and the other lead to the supposed trigger wire. I think pushed the button on the door jam to simulate a shut door, 12 volts. I let the button out and got 12 volts. Im assuming that this is the wrong wire? Its a 2005 nissan sentra 1.8s. Any ideas? Thanks in advance. Also when i wired everything up as per the diagram the radio wouldnt shut off if that helps at all.

Im still trying to figure this out and Iv came to the conclusion that the Red White is the signal to the passanger window to go down.

look for a red wire if the car has factory keyless.

sorry disreguard the other post by me. its red (-) if the car has factory power locks. RED / white is the passenger front door trigger if the car does not have power locks use the RED / white.

well i think I found the right wire it is RED / white still just a smaller gauge.. Who would of thought lol thats for the help.