Parrot MULTICOMM is a unit able to control Parrot H/F kits with the car’s steering wheel commands working with ANALOG STEERING WHEEL COMMANDS with OEM head unit installed. This device is applicable for Chevrolet Kalos, Evanda, Tacuma and Matiz. This unit is available in two versions, one working with the CK3000 Evolution, another for the CK3100.
Here you will find detail installation procedures of the devices, Wiring diagram for CK3000 EVOLUTION and CK3100 LCD, Parrot Multicomm interface, keypad adapter, mute input, and the wires corresponding to the Chevrolet protocol configuration.
Find more info about Parrot MULTICOMM For Chevrolet steering wheel and the schematics diagram here. (source: parrot.com)