Relay location?

[StuggyZX10]

Hi i am trying to identify which relay in the fusebox in the boot of my 2003 E320 Diesel operates the heated rear window. It is not working and i have checked the fuse F10 and its fine next step i want to do is test the relay..and i dont have the card that comes in the fuse box or a workshop manual and i can find no diagrams on the net to identify the relay's...just the fuses can anybody point me in the direction of it many thanks.....stu

 

[Cole@MBS]

Its one of the 2 four pin black relays in the rear sam, cant remeber which one of the top of my head!!