Hi, I have just been through the same anguish as the wiring colours connecting to the speakers in the door don't correspond with any colours I've seen online. My wiring has the same colours as yours. However, today I confirmed positive and negative with a multimeter from the back of my new Sony head unit. I established that front right is green positive and green/brown negative. The green ends up on the radio plug block on pin 3 (orange). The green/brown ends up on the radio block on pin 4 (brown/pink).
My front left at the speaker end was light purple/white which is the negative and appears at the radio block on pin 6 (black/white). The other wire was a light purple/black which is the positive and appears at the radio block on pin 5 (purply/brown colour). Check yours is light purple not grey on front left. My new head unit sounded no better than the original radio until I did this exercise. I had the left speaker reversed. Now it sounds much better.
My car is a 2011 Night Orange Cabrio MHD, in the UK
Good luck
Martin
My front left at the speaker end was light purple/white which is the negative and appears at the radio block on pin 6 (black/white). The other wire was a light purple/black which is the positive and appears at the radio block on pin 5 (purply/brown colour). Check yours is light purple not grey on front left. My new head unit sounded no better than the original radio until I did this exercise. I had the left speaker reversed. Now it sounds much better.
My car is a 2011 Night Orange Cabrio MHD, in the UK
Good luck
Martin
