speedgun

How can I reprogram this keyless entry without the dealer? I have a total of 3 remotes and I have only one working. It seems when the battery dies so does the remote...I have tried and errored by chance on some methods but is hopeless without the right combination. The Gun

GMMerlin

Transmitter Synchronization Domestic
Resynchronization may be necessary due to the security method that the remote keyless entry system uses. The transmitter does not send the same signal twice to the receiver. The receiver will not respond to a signal that has been sent previously. This prevents anyone from recording and playing back the signal from the transmitter.

Resynchronization may be necessary under the following conditions:

The transmitter battery is changed
The vehicle battery is disconnected
The transmitter buttons are pushed 256 times out of range of the receiver
In order to resynchronize the transmitter with the receiver, stand close to the vehicle and simultaneously press and hold the LOCK and UNLOCK buttons on the transmitter for 7 seconds. The door locks should cycle in order to confirm resynchronization.

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speedgun

If resync doesnt work, how can i reproram the remotes without a tool?