Synchronize keyless entry

The manual for a 2003 Tahoe I bought used states that after changing the battery in the keyless entry unit, the unit must be synchronized. Cannot find any
reference in the manual for how to do this. Not listed in the otherwise most helpful index, and not part of the battery-changing instructions, except that it has to be done. Can anyone tell me how to do this? Don't want to change the battery and end up with a useless device. Any help greatly appreciated.
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No mechanic wrote:

1. Close all vehicle doors.
2. Insert the key into the ignition.
3. Hold down the power UNLOCK button on the driver’s door panel-continue to hold down until instructed to release in step 9.
4. Perform steps 5 through 8 in fairly rapid succession.
5. Turn the ignition switch to the ON position (NOT START)
6. Turn the ignition switch to the OFF position.
7. Turn the ignition switch to the ON position.
8. Turn the ignition switch to the OFF position.
9. Release the power unlock button on the door panel. The vehicle will lock and unlock the doors automatically.
10. Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously until the door locks and unlocks. >> This step may take up to 30 seconds. <<
11. Repeat step 10 NOW for each additional transmitter (including any existing transmitters).
12. Turn the ignition switch to the ON position in order to exit the transmitter programming mode.
--
Steve W.

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