Thank you for the reply, there are 2 ways to get the number for the keyless entry pad, either you can visit the dealer and have them pull the code from the module or you can get it from the label on the security module, the security module on your truck is located behind the right side rear quarter trim panel, about level with the second row seat, here is the procedure to get to the module, hope this helps.
Removal and Installation
All vehicles/Left side shown, Right side similar.
Vehicles without third row seat
NOTE: Right side shown, left side similar.
Vehicles with third row seat
Here is the security module.