As long as you dont have auto /remote start the following link tell how to program the remote if remote start need dealer to reflash fob
How to Program Keyless Entry for 2005 Pontiac Grand Prix eHow
SOURCE: how do you program the remotes for keyless entry
Transmitter Programming
No Tools Required
In the event that a transmitter is lost, program the old and the new transmitters into the memory of the remote control door lock receiver. Up to 4 transmitters may be programmed.
Important
Once the keyless entry receiver enters the programming/diagnostic mode, the programming of the first transmitter erases all previous transmitter programming information. You must then program all of the transmitters.
Program only 1 vehicle remote control door lock receiver at a time. If you program multiple receivers simultaneously, the same transmitter could possibly be programmed to more than 1 remote control door lock receiver.
Perform the following steps:
Sit in the vehicle driver's seat.
Remove the ignition key from the ignition lock cylinder.
Close all of the vehicle's doors.
Remove the MALL PGM fuse from the fuse panel. Refer to Electronic Diagnosis in Body and Chassis.
Turn the ignition lock cylinder to the ACC position.
Turn the ignition lock cylinder OFF, then back to ACC within 1 second.
Open and then close any vehicle door. You will hear a chime when the remote control door lock receiver enters the programming/diagnostic mode. If you do not hear a chime, start again at step 1.
Important
After 7 seconds, you may hear a chime confirming successful synchronization. After approximately 14 seconds, you will hear a chime confirming successful programming.
Press and hold the transmitter LOCK and UNLOCK buttons simultaneously for 14 seconds.
Repeat step 8 in order to program each additional transmitter.
Remove the ignition key from the ignition lock cylinder.
Install the MALL PGM fuse back into the fuse panel. Refer to Electrical Diagnosis in Body and Chassis.
Validate that all the transmitters that were programmed operate properly. Refer to Keyless Entry System Operation
SOURCE: programming new keyless entry remote
Yes...
1) Remove the "MALL PGM" fuse located in the glove compartment (see owners manul for location)
2) Turn ignition switch to "Accessory" then "Off" then back to "Accessory" witin 1 second. (accessory is opposite the forward direction key is normally turned for starting the vehicle)
3) Plug in drivers side seat belt.
4) Open and close a door (will hear a chime indicating in program mode.)
5) Press and hold both the "Lock" and "Unlock" buttons on the Fob and wait at least 7 seconds (may take longer) you'll hear a chirp or the horn will sound.
6) repeat step 5 for all other Fobs.
7) turn key to Off and replace fuse.
SOURCE: Programming a 2006 Pontiac Gran Prix Keyless remote
The rke on 06 pontiac only can be programed using a diagnostic scan tool or Tech 2.
Conect the scan tool to the vehicle. turn key to on position.
Select 1 body, 2 them select special funtions
3 slect program key fob,
4 select the number of key fob you want to program.
5 Press and hold the lock and unlock key simultaneous. about 15 seconds
The power lock cycle confirm the remote is programed.
SOURCE: 2004 PONTIAC GRAND PRIX FUSE BOX DIAGRAM
The diagram is on the fuse box cover or lid (depending on which fusebox, cabin or engine compartment. The diagram is also in the owner's manual.
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THE 2005 GRAND PRIX CAN ONLY BE PROGRAMMED WITH TECH 2 OR SCAN TOOL YOU CAN NOT PROGRAM IT ANY OTHER WAY
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