2004 Chevy Trailblazer Key Fob Programming: Step-by-Step Guide

bdmin February 21, 2025No Comments

Lost your key fob or need to program a new one for your 2004 Chevy Trailblazer? No need to visit a dealership right away. Programming your key fob for your 2004 Chevrolet Trailblazer can be done right at home with a few simple steps. This guide will walk you through the process to get your keyless entry working again in no time.

Step-by-Step Programming Instructions

Follow these instructions carefully to program your 2004 Chevy Trailblazer key fob:

Ensure All Doors Are Closed: Begin by making sure all doors of your Chevy Trailblazer, including the tailgate, are completely closed.
Insert Key into Ignition: Place your key into the ignition cylinder.
Press and Hold Unlock Button: Locate the power UNLOCK button on the driver’s side door panel. Press and hold this button down. Do not release it until instructed in step 9.
Rapid Ignition Sequence (Steps 5-8): Complete steps 5 through 8 in quick succession.
Turn Ignition to ON Position: Turn the ignition key to the “ON” position. This is the position right before you would start the engine. The dashboard lights should illuminate.
Turn Ignition to OFF Position: Turn the ignition key back to the “OFF” position.
Turn Ignition to ON Position (Again): Turn the ignition key to the “ON” position once more.
Turn Ignition to OFF Position (Again): Turn the ignition key back to the “OFF” position for the final time in this sequence.
Release Unlock Button: Release the power UNLOCK button on the driver’s door panel. At this point, listen for the vehicle to respond. The door locks should cycle, meaning they will lock and then unlock automatically. This indicates that your 2004 Chevy Trailblazer has entered programming mode. If the locks do not cycle, you will need to repeat the procedure from step 1. Ensure you release the unlock button after the locks cycle, not before.
Program the First Key Fob: Take the key fob you wish to program. Simultaneously press and hold both the LOCK and UNLOCK buttons on the key fob. Continue holding both buttons until you hear the door locks cycle again. This may take up to 30 seconds. This step programs the first key fob.
Program Additional Key Fobs (if applicable): If you have additional key fobs to program, including any existing remotes, repeat step 10 immediately for each additional key fob.
Exit Programming Mode: Turn the ignition key to the “ON” position one last time to exit the key fob programming mode.
Test Key Fobs: Remove the key from the ignition and test all programmed key fobs to ensure they are working correctly by pressing the LOCK and UNLOCK buttons.