1998 toyota sienna / valet 561r

Are u talking about the BLACK/ white on the 561r?  If so the 561r remote start unit comes with a switch put one end of the switch to ground and the other side to the BLACK/ white of the 561r.  It will turn the remote sart off and you cant start it wit the remote example if your bringing it in for service or something. where the hood will needed to be opened.  

Or just put the BLACK/ white of the 561r to ground and forget the switch.  I would do a hood pin then. But I would do the switch anyway.