Found it in the haynes z22se engine management wiring diagram, its the relay for the secondary air pump. Which we dont have?
thick black - +12v
thick brown - 0v
thick red/blue - secondary air pump +ve
thin red/blue - Ignition pos II - F36 20A
brown/grey - ECU a7
Fuse 36 is present, marked as a KL. 15
Is this lot present on anyone elses vectra?
Might steal the 60A black to power my headlamp wash jets 🙂