Huh? I'm a bit confused. Isn't relative pitch... relative? So it wouldn't matter what pitch they are.Do you mean identifying intervals?
Maybe you could try listening to songs and playing them back... if you know what the notes are,you can know the intervals,right? My teacher suggested playing chord progressions,focusing on how they sound,so that you're more familiar with them. Then maybe you can find a song with similar chords and try transcribing it by ear. Fix the position of the first note and take note of all the chord changes,then work from there. The music program I go to includes aural training,and they do something like this; the teacher plays it,then you play it back.Listen actively to all the notes. Good luck!