Only have one key and not remote, how do I get

Astrostart Alarm Key Fob Remote Programming Instructions

1. Open you hood. If needed, jump the red/black wire to a good ground.
2. Turn the key on, press and release the brakes.
3. Turn key from on to off 3 times. (OFF - ON - OFF -ON - OFF) The Park lights will blink 4 times. ...
4. Push any button the first remote to be programmed. Repeat for all remotes. ...
5. Turn key on and press brakes once.

Have you tried replacing the battery in it?

Try this

2004 XL7

1. Remove key from ignition switch.

2. Close all doors.

3. Open drivers door

4. Insert key and turn to ON position and within 10 seconds turn
key off and remove key.

5. Within 20 seconds Close and open drivers door 3 times.

6. Insert key and turn to ON position and within 10 seconds turn
key off and remove key.

7. Locks should now lock and unlock automatically to confirm you
have entered programming mode.

8. Press the UNLOCK button on remote and locks should cycle to
confirm programming.

9. Repeat step 8 on each additional remote.

10. Exit vehicle with keys and remote, close door test remote(s)

remote key need diagnostic equipment to reprogram key.

Is the battery ok in the remote?

Sir,
In every remote there is a cell to give it a power . it seem to me that the cell of your remote have completed its age. you are suggested to replace the cell of remote with new one. Hope fully your problem will be solved.

You car has an integrated key and remote.

There is a software that needs to be downloaded to the car. When the remote is purchased at the dealer it comes in a plastic package. That plastic package has a sticker on it. The sticker contains id codes.

There are two codes one is 16 digits/letters and the second one is 8 digits/letters.

Without this sticker the dealership can not program the remote/key to the car. If you buy a key elsewhere, make sure it has the codes included.

Unfortunately you cannot program a remote yourself.

The procedure goes like this. First get in the car and lock all the doors. Secondly insert and remove the key repeatedly until the turn signal indicators on the dash flash twice simultaneously, it should be like seven or eight times. Then turn the key on and press the lock button on the remote and the lights should flash again. After that turn the key off and manually unlock and open the drivers door, then shut it. Wait a few seconds then try the remote. 

You can go to the dealer and have the new remote and the car re-programed so they match and the old luck transmitter with not work on your car. Good luck

Dear Customer,

If you didn't change your remote kit than its a best way to take to your dealer ,there is minor problem with sequence so they wil do free of cost with car document.

THNX