To enable a debug menu in Star Wars Racer you need to go to the Tournament menu, select an empty "file", now hold Z while you select the word RRDEBUG, hit L to pick each of the letters. The word will then be written at the bottom left side of the screen and when the word has been entered, choose End, hit L (while keeping Z pressed), then release Z and hit A. Now enter your name, without Z pressed, and start a tournament.

Press Start to pause the game and press LEFT, DOWN, RIGHT, UP and a secret cheat menu will appear. When you enter the cheat menu, the debug menu is activated.

DEBUG MENU #2 (EXTENDED)

There's yet another debug menu, the procedure is the same as above, but the word is RRTANGENTABACUS.

In this menu you have a set of hidden keys as well, set the debug mode to anything but 0, then while racing try either of the following.

"Z + LEFT" makes you look though walls (nightvision)
"UP" makes you fast forward through the level
"DOWN" makes you reverse/rewind through the level
"RIGHT" self destructs your racer
"LEFT" makes the racer invincible

The codes are currently untested in the PAL and JPN versions.