Thanks to RogerJ for sharing this info. *Please note this is for the Primera Camino, Not a UK Spec Primera

The following appears to be the connections after cable tracing and multimeter testing

Large plug

 Left Front Speaker blue   
 Right Front Speaker brown   
 n/c
 n/c
 ??????   red/yellow  
 power ignition switch blue/brown 
 Left Front Speaker  black/white 
 Right Front Speaker black/red  
 Aerial Motor  red  
 Unswitched battery purple/black 
 n/c
 n/c

Small plug

 n/c
 n/c
 Right Rear Speaker orange  
 Left Rear Speaker black/yellow 
 Left Rear Speaker light green  
 Right Rear Speaker purple/black 

The only one I have not been able to identify is the red/yellow lead.