At the options screen, choose the "Password" selection. Then, enter one of the following passwords to unlock the corresponding cheat function.

Password - Effect

THREESTRIPES - Adidas Sponsership
GAMEFACE - All Golfers
TENGALLONHAT - Big Head Crowd
SHOJIRO - Bridgestone Sponsership
SNAKEKING - Cobra Sponsership
JUSTSHAFTS - Grafalloye Sponsorship
INTHEGAME - Level 3 EA Sports Sponsorship
MACTEC - Macgergor Sponsorship
RIHACHINRZO - Mizuno Sponsorship
JUSTDOIT - Nike Sponsorship
JANNARD - Oakley Sponsorship
LIGHTNING - PGA Tour Sponsership
SOLHEIM - Ping Sponsership
GUYSAREGOOD - Precept Sponsorship
MRADAMS - Taylormade Sponsership

Note: Not all items are unlocked with these codes; some items must be unlocked manually.