Help needed diagnosing an electrical fault on a p38 rangy

[Discopotatoes]

After loosing my central locking on the key fob I began down the road of trying to fix it.
My local specialist couldn't get their computer to communicate so said they couldn't help,
I've re wired the odb2 socket but still can't get comms on my code reader, that use pins 7 and 15.
I have 12 v on pin 16 and a good ground on pins 4 and 5, I also have a voltage of 1.5 on pin 7 but nothing on pin 15 ( after hours of searching I can't find any info on wether there should be any voltage on 15 , but as its used to wake up the ecu's I'm guessing it should)?
Any help would be greatly appreciated

[Penelope Stopit]

Go here

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

[paintman]

http://www.p38rangerover.com/central-locking/the-c...

[Discopotatoes]

Just to put this to bed. I found a factory wire splice that had completely corroded through, so now have comms with my scanner so should be able to move forward and rest can the key fob. Thanks for your help