progressive door lock

I have installed a clifford 590.2x in a 1989 nissan pickup. I have shaved door handles and was using the negative door lock trigger to activate my actuators. I read that you can program a progressive door unlocking function where the driver doors unlocks first and then the passenger when the unlock button is pressed again. The question i have is which wire controls the 2nd unlock trigger?  I can use one of the aux inputs to unlock the 2nd door but i don't really want to. in Vipers 5902 manual it refers to a light blue 2nd unlock trigger wire but there is not one on the clifford model that i can find. Do i need to add an extra module? 

any help would be appreciated.

Thanks