Having problems with your 2004 Chevrolet TrailBlazer ?

Doors dont lock with secrity fob

\015 I had to have the hatch door replaced and now my security fob does not work\015 Posted / edited by AnonymousUser on : 17-01-2022

Answers :

The receiver for the fobs is located in the rear hatch, and it needs to be reprogrammed to the fobs. Try the following procedure;

1. Close all the vehicle doors.
\0122. Insert the ignition key into the ignition lock cylinder.
\0123. Press and hold the door unlock switch.
\0124. While holding the door lock switch in the unlock position, cycle
\012the ignition ON, OFF, ON, OFF.
\0125. Release the door unlock switch. The doors will lock and unlock to
\012confirm the program mode.
\0126. Press and hold the LOCK button and the UNLOCK button
\012simultaneously on one transmitter. After a delay of approximately 15
\012seconds, the doors will lock and unlock to confirm the programming of
\012that transmitter.
\0127. Repeat the previous step to program up to four transmitters.
\0128. Turn the ignition switch to the RUN position in order to exit the
\012keyless entry transmitter mode.
\0129. Operate the transmitter functions in order to verify correct
\012system operation.
Repair Help & Product Troubleshooting for 2004 Chevrolet TrailBlazer

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