If the avalanche is anything like a 2003 chevy silverado you can program the door locks as follows.
2003 silverado door lock programming.
The doors will lock and unlock to confirm the program mode.
This procedure essentially wipes allremotes from the vehicles memory so all must be reprogrammed press each button on the remote 26 times lock x 26 unlock x 26 horn x26 then attempt the steps outlined below.
Turn the ignition switch to the on position in order to exit the transmitter programming mode.
Hold down the lock and unlock buttons on the transmitter simultaneously until the door locks and unlocks.
1997 2000 you can program up to 4 remotes on this vehicle 1.
After a delay of approximately 15 seconds the doors will lock and unlock to confirm the programming of that transmitter.
Up to four remotes can be programmed.
Repeat step 10 now for each additional transmitter including any existing transmitters.
Turn the ignition on 2.
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2003 chevrolet silverado 1500 remote programming you must have all gm remotes including working ones when performing this procedure.
Program any additional remotes for repeating step 6 for each remote.
Press the lock side of the power door lock switch on the door panel twice.
This step may take up to 30 seconds.
Press and hold the lock button and the unlock button simultaneously on one transmitter.
Within 4 seconds press lock or unlock of first remote 3.
Press the lock side of the power door lock switch on the door panel once.
Your silverado will automatically cycle the locks as it did in step 2.
Simultaneously hold down the lock and unlock buttons on your fob for 15 seconds.
Release the door unlock switch.
Step by step how to programming instructions for a 2003 chevrolet chevy silverado 1500 2500 3500 keyless entry remote fob.
With vehicle off pull back the high beam headlight lever high beams are on 2.