Spot on.
In summary, if you have an 09 OB, pull the white harness, disconnect the blue/black wire only and then plug the harness back in, you will have disconnected the DRLs only. Full beams will function as normal (and have the symbol light up in the dash) as will cruise control.
Thanks to all for help on this, happy to have saved my new HIR1s some unnecessary burn time.