reprogamming keyless remote

i have a 2000 chevy astro van and i need to reprogram the remote any suggestion on how to do this????

Document ID# 605202
2000 Chevrolet/Geo Astro - 2WD

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Transmitter Synchronization
Due to the security method used by the remote keyless entry (RKE) system, the transmitter may have to be synchronized. The RKE transmitter does not send the same signal twice to the receiver because the receiver will not respond to the same signal twice. This prevents the signal from being recorded and retransmitted.

Synchronization will be necessary if one or more of the following conditions apply:

The transmitter battery is very weak.
The transmitter is replaced.
The vehicle battery is very weak.
The vehicle battery is replaced.
The vehicle battery is disconnected.
Synchronize the transmitter with the receiver as follows:

While standing close to the vehicle, simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for 7 seconds.
The door locks should cycle in order to confirm synchronization.

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Document ID# 605202
2000 Chevrolet/Geo Astro - 2WD

Document ID# 605202
2000 Chevrolet/Geo Astro - 2WD

--------------------------------------------------------------------------------

Transmitter Synchronization
Due to the security method used by the remote keyless entry (RKE) system, the transmitter may have to be synchronized. The RKE transmitter does not send the same signal twice to the receiver because the receiver will not respond to the same signal twice. This prevents the signal from being recorded and retransmitted.

Synchronization will be necessary if one or more of the following conditions apply:

The transmitter battery is very weak.
The transmitter is replaced.
The vehicle battery is very weak.
The vehicle battery is replaced.
The vehicle battery is disconnected.
Synchronize the transmitter with the receiver as follows:

While standing close to the vehicle, simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for 7 seconds.
The door locks should cycle in order to confirm synchronization.

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Document ID# 605202
2000 Chevrolet/Geo Astro - 2WD


thanks i tried that but it did not work. the remote i have was never set for this vehicle maybe it needs to be programmed a differant way any suggestions

You may have the wrong part number remote.
If you have the original remote that came with the vehicle, check the part number on the back. All the remotes should have the same number.