If you look next to the battery there is a black plastic box with a lid held on with seven torx 20 screws,in there are various relays etc and at the front is a large yellow relay,replace that and your problem should be ok,you may have to go to a vauxhall dealer for the relay itself,remove the n/s 8mm screw holding the scuttle panel,the rubber seal which runs across the bulkhead,the cover which is over the battery cables and the n/s scuttle panel lifts up enough for access to the lid,good luck.
cdc
August 2014