Hi,
no preinstalled wires at all, my Astra Z14XEP 2006 Estate was naked, upper Image from XE2 shows all you need.

UEC #X2
Pin #38 is 12v+ Ignition
Pin #54 is CanBus Signal to Rainsensor

4PIN Molex:
#1 black +12V Ignition from XE2 #38 > Rainsensor / Mirror #1
#2 Brown Ground > Rainsensor / Mirror #2
#3 Green XE2 Can-Bus Signal from XE2 #54 > Rainsensor #3
#4 Grey Timer Signal > Mirror #3




Retrofitted: AFL, Rear elect.Windows, TPM, DDS, HSA, Recaro Leather, Seat Heat, complete OPC Line all bunch a stuff...
Current Status: fitting in Z20LEH