No sound whatsoever out of my 208 Cadillac DTS. Fuse? Amp? what else do i check?

You can't disable it , sound comes from the radio out of driver door speaker . The BCM - body control module sends this signal to the radio on serial data bus . A faulty input signal to BCM - door ajar switch probably . You need to take it to a qualified repair shop .

There is no dinger as the other guy suggests . sound comes from the driver door speaker .
The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings through the left front speaker. The radio receives audible warning requests via the class 2 serial data line. If the radio receives multiple audible warning requests, the warning with the highest priority sounds first. On vehicles with an audio amplifier, the amplifier instead of the radio generates the audible warnings and receives audible warnings requests via the class 2 serial data line. Either the radio or the audio amplifier is the chime producer. The following lists the audible warning priority and the pulse rate:
Fast rate chime (150 pulses per min)
Medium rate chime (100 pulses per min)
Slow rate chime (50 pulses per min)
Turn signal reminder (will pulse at turn signal flasher rate)

Your best bet ,wear your seatbelt . so the sound goes off . If you do wear the seat belt and the chime sounds ,have a qualified repair shop check it .

check fuses first, cab and bay
if all good
scan the PCM .
or get it scanned.

On some GM vehicles, the radio has to be re-programmed to the vehicle because of the anti-theft system. You may want to check with your local dealer.

sounds like a circuit or fuse has blown out.

Hi James, Im AL the owner of Big As Auto Repair.

James, Cadillac stereo systems have an amplifier and usually when there is no sound from the speakers its because either the fuse to the amp is blown OR the amp itself is bad. Hope this helps and please visit my auto-repair-website here: http://www.bigasautorepair.com/

Activate Pre-Owned Vehicle ' OnStar

https://www.onstar.com/preowned
OnStarRequires factory-installed and enabled remote start. Requires automatic ... Visitonstar.com for vehicle availability, coverage map, details and system limitations.

[PDF]Cadillac DTS 2007.pdf - costartech.com

www.costartech.com/pb/.../Cadillac/DTS/Cadillac%20DTS%202007.pdf
Feb 9, 2012 - 2007 Cadillac DTS ' DTS (VIN K) Service Manual ' Driver Information and ... the keypad will NOT reset this version of the OnStar® system.

Chimes are generated by the radio. Unplugging the radio and then plugging it in can activate the security feature in the radio and is very unwise. You can try resetting it by disconnecting the negative battery wire, then plugging the radio in and reconnecting the battery wire. If that doesn't work, check with a dealer to see if they can reset it, but if the radio has been damaged by what you are doing, you may have to replace it.

Check the radio fuse. As unusual as it seems, GM has started having the radio (even though not turned on) generate the chimes and turn signal sounds. If the radio fails, all the chimes fail too.

This applies to other vehicles besides the HHR. My 2003 Silverado had the door chimes fade down so I could barely hear them. The fix was to replace the radio (under warranty, fortunately...).

I had the same problem with my 04 Suburban, sound and then no sound from anything (radio, on star, door chime, etc). The dealership thought it was the radio, so they put a new radio in. A day later the same problem. It turned out to be the amplifier under the center console. Everything is working with no problem for over a year.