the colors are an EIA standard
i guess you wacked out the factory standared harness connector? wow !
the yellow wire is the memory as you can see below.
tape off the unused, especially any head end speaker lines cuz if they ground out , kiss off the amp in the radio/etc.
the connector and the colors here. first hit in google.
SUZUKI GRAND VITARA FACTORY OEM CAR RADIO WIRE HARNESS - (eBay item 150161105944 end time Sep-19-07 20:08:02 PDT)