Took another look at the FSM and it does show the rear fog indicator in the wiring diagram, but the only wire colors called out are the same as in the diagrams for other parts of the insturment cluster and I think are associated with the PCI bus to the BCM. Best bet may be to pull the cluster and check the wiring for that slot; that would also let you see if there is a bulb there to energize. If nothing else you can trace it out to the connector and see if you can find it that way. Wiring it to the junction block and installing the relay there might be easier - it looks to be a standard relay.
Good luck 
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