Heated rear window wiring

[GREENYORKIE]

Slowly but surely I am making sense of the wiring loom on my Beta coupe but have stalled on the rear screen heater switch. there are 5 wires going to the switch coloured pink,black,red,yellow and white with black tracer. I have 12v at the red. None of my wiring schematics show a 5 wire switch. Can anyone throw any light on on the purpose of the other cables?
Thanks, David.

[GREENYORKIE]

I am a little further forward but still need some help. The yellow and white/black cables supply the bulb in the switch.The pink cable goes to the indicator bulb in the dash and the black feeds the rear screen.However I've no supply at the black or pink cables and am unsure how the relay is wired into the circuit. Anyone? 

[thecolonel]

As far as I remember :
Red    (pos +) into switch,
Black  (pos +) out of switch to HRW,
Pink    (pos +) out of switch to warning light
yellow and white/black  night illumination circuit

[GREENYORKIE]

Thanks for the info Geoff, finally got power at the heated element but as the switch is a bit dicky will live without the light.
David.

[thecolonel]

I have a rocker switch from a late series if that's
any use.