don't know if this is what you have, so look it over to compare. It's from ALLDATA for your vehicle (2000 Pathfinder). I had to re-type the info and left out the last section which deals with the Quest.
INFO:
For 1998-2000 Maxima, Pathfinder, Sentra, Altima, and Frontier Vehicles 2000 Quest and Xterra Vehicles:
- Programming Procedure: A. Get in the vehicle. Close and lock all doors using the driver's power door lock-unlock switch.
B. Insert and remove the ignition key more than 6 times within a 10 second period (at a rate of one insertion/removal cycle per second). The key should be withdrawn from the ignition key cylinder completely each time it is removed.
NOTE: Do not rush the insertion/removal key cycling process.
C. Turn the ignition key to the "ACC" position. The ignition key should remain in the "ACC" position throughout the remainder of the programming, including programming of additional remote controllers.
D. Press any button on the remote controller one time.
NOTE: Do not press the button more than one time in the above step. It the button is pressed more than one time, the programming procedure will not be successful.
The hazard warning lights will flash twice when this step is accurately completed and programming is successful. For 2000 Quest vehicles, the side marker/tail/license lamps will flash twice when programming is successful.
E. If you are programming only one remote, proceed to step 3A. If programming additional remotes, continue with step 2A, below.
- Programming Additional Remote Controllers (Maximum of 4 Remotes):
A. Remain inside the vehicle after programming the first remote.
B. Use the driver's power door lock-unlock switch to unlock and then lock the doors.
C. Press any button on one of the additional remote controllers one time.
NOTE: Do not press the button more than one time in the above step. If the button is pressed more than one time, the programming procedure will not be successful.
The hazard warning lights will flash twice when programming is successful. For 2000 Quest vehicles, the side marker/tail/license lamps will flash twice when programming is successful.
If there is more than one additional remote to be programmed, repeat steps 2A through 2C above for each additional remote.
- End Programming:
A. Remove the key from the ignition.
B. Use the door lock-unlock switch on the driver's door to unlock the doors. Open the driver's door to complete the programming.
C. Check the operation of each of the remote controllers by locking/unlocking the doors with each remote controller you have programmed.