have you removed the glove box inner liner ?if yes look up and you will see a small black box about the size of a cd box it will bend down ,just pull, there is a long rectangular connector which has a locking mechanisim on it disconnect the connector and wait 15 mins reconnect and press the voice button on the radio stalk on the sihe of the steering wheel and you should hear the voice command ,this may have to be repeated a few times
Could you not pull the relevant fuse? Would be easier surely?