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Q: the fob that operates the power door lock system does nothing. on 2003 Chevrolet Tahoe

tried the second fob with new batteries in both but still nothing any suggestions?
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Customer Concern: The keyless entry will not work; the batteries were changed in the key fob.

Tests/Procedures: 1. Synchronize the transmitter by standing within 1.5 meters (5 ft) from 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 resynchronization.

2. After desynchronizing the transmitters program the keyless entry by:
Close all the vehicle doors.
Insert the ignition key into the ignition lock cylinder.
Press and hold the door unlock switch.
While holding the door lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
Release the door unlock switch. The doors will lock and unlock to confirm the program mode.
Press and hold the LOCK button and the UNLOCK button simultaneously on one transmitter. After a delay of approximately 15 seconds, the doors will lock and unlock to confirm the programming of that transmitter.
Repeat the previous step to program up to 4 transmitters.

3. Turn the ignition switch to the RUN position in order to exit the keyless entry transmitter programming mode. Operate the transmitter functions in order to verify correct system operation.
Tech Tips: Refer to bulletin 03-08-52-001 related to the keyless entry system inoperative.
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