You will need a jumper wire to jump pins 4 and pin 8 on the ALDL under the dash. Then hold both the lock and unlock buttons together on the key fob until the locks cycle, program complete!!
SOURCE: program a new key fob for a 2002 chevy tahoe
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 (as far as you can go without starting the
engine).
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.
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