looked up some documents from 12volt.com from alarm systems under that heading they had the pink as ignition which would work for the amp and they also had a orange/black tracer for factory disarm. The plain orange is 12volt all time which is in the larger stereo harness. and 12volts wiring diagrams for the radios are not matching the colours from the factory they need to update a little.
shows right rear having a blu/wht when its black from factory.