Radio has no sound ??

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 .

Do you still hear warning chimes ?
The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings. The BCM receives audible warning requests via the class 2 serial data line or the controller area network (CAN) data line. If the BCM receives multiple audible warning requests, the warning with the highest priority sounds first. The following lists the audible warning priority and the pulse rate:
Do you have base or uplevel system ? Who put in the NEW delco radio ? I suggest you watch this video . GMC Acadia Diagnose Radio Volume Stuck On HIGH Part II A GM radio is the same for chevy , gmc , buick etc... an could need programming , just watch eric .He had radio fixed same problem .Some times you can't get away from going to the dealer.

The audible warnings alert the driver of a system concern or a critical vehicle condition. The radio generates the audible warnings through the speaker. The radio receives audible warning requests via the serial data circuit. If the radio receives multiple audible warning requests, the warning with the highest priority sounds first. The following lists the audible warning priority and the pulse rate:
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Fast rate chime (200 pulses per minute)

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Medium rate chime (150 pulses per minute)

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Slow rate chime (50 pulses per minute)

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Single chime

The bcm controls that device for the addition of features like blue tooth and hands free, on-star etc.

IF the speakers are in the doors then the wiring harness in the door-jam is frayed, and you must cut the rubber to access the wires between the door and the door jam to get at the wires without taking the door apart.

I would say that the factory amplifier is not functioning. All sounds go through the radio, including the chimes.

you have a bad amp

I am having same problem with 2008 g5 , no radio , no alert sounds does anyone know what is the problem