Speakers and door chime not working on 2006 Trailblazer

There is no fuse just for door ajar chime.

Door Ajar Warning Chime The door ajar warning chime warns that a door is ajar. The door ajar warning chime is a single chime with a 1 second duration. The door ajar chime sounds when the driver or passenger door becomes ajar while the ignition switch is in the ON position.
The door ajar warning chime inputs are:

• the ignition switch ON position
• the door ajar switches

The output is the instrument cluster chime.

The door chime is sent through the stereo system, the chime comes out through the driver side speaker.

The door speakers need to be replaced.

Blown speaker or bad connection

No separate fuse for the chimes, runs on direct battery power as a safety measure. Only way to disable it is to find the "chime box" and unplug it. Usually under the glove box area.

You may have a short in your wiring and it may cause more damage by touching any metal surface depending were the routing of the wires run through because the whole car is negative therefore I suggest you take it to an expert electronics technician right away for and electronic diagnostic check up!

{: ) It's possible that one of your doors not closing fully. The doors may need some doorlatch-to-striker adjustments, or it can be a wiring issue. A scan tool is better able to detect which of your doors is causing this unexpected signal.
You can try some diy test: Park your car, handbrakes on, engine running, and windows open. Get off your vehicle, and close all doors like you normally do. Go to each door, grasp the handle but dont open. Try to move the door to and fro and check for any play or looseness, at the same time you monitor the dash for any messages or hear the chime.

under warrantee take it to the dealer and say FIX THIS

I don't think it is a fuse.
The warning chimes for this vehicle come through the radio and are play to the speakers and if I remember correctly the chimes play to the left front speaker.
I would check for a faulty speaker or wiring to the speaker.