My car came stock with the Securikey system, yours may be different but this is what my book says to do:
1) Start with the LED valet switch in the off position, then turn the vehicles ignition key off then on.
2) Within 10 seconcs, cycle the LED valet switch to the on then off three time (press and release 6 times).
3) If the chirps were off before you started, then you will hear 1 chirp indication that they have been turned on.
4)If the chirps were on before you started, then you hear 2 chirps indicating that they have been turned off.
Like I said this might not be the sysytem you have but FYI for those who have Securikey... Hope it helps