Wiring question
 

My son wants to install a backup camera on his 98 S70 T5. In order for it to come on when the car is in reverse, the camera needs to be powered by the reverse lights. Can someone tell me which wire on the connector is the hot wire for the lights when in reverse. I don't have a wiring diagram, and I suppose I could try to probe with my volt meter, but I figured it would be easier to ask here first.

Thanks in advance,

Glenn