just a little ahead of your radiator where the lower radiator pipe connects - there should be a two prong round wiring plug, take it out and short the two terminals with a piece of wire - with the ignition key on the fans should kick on, IF not and you dont hear the relays in the fuse box click - check for body ground at one of the terminals - it should have solid body ground.
Take a test lamp and check for ground at the connector - and also check by directly supplying ground to the trigger terminal in the 2 prong connector, The fans should kick on. If yet they dont start - but you hear the relays clicking - check the fan connectors on the centre of the radiator - try hot bridging the fans - if they work - then your relay(s) are defective or the cooling fan fuse has blown.