It starts ok, then cuts out with a audible warning.

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

Are you aware of the fact that your factory radio is connected to the class 2 serial data communication network . You need a interface module to hook up to aftermarket radios . If you don't use this interface module your vehicle will not start an run an the warning chimes will not work .
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. The following lists the audible warning priority and the pulse rate:

When it comes up the screen, the sensor part is working. It could be the buzzer is defect, or just the wiring or a connector to the busses or speaker is lose. Start checking the whole chain.

Find the beeper. Cut one wire and wire nut off both ends of the cut wire.

Hi.if you have a diagnostic machine it can be switched of via basic settings

NOTE: If a double audible warning sounds during the programming procedure a system malfunction has occurred. Repeat programming procedure.
Obtain all keys fitted with remote control. Open driver's door. Operate headlamp high/low beam switch to flash high beam position and hold. Insert key into ignition switch, turn to ACC position. Ensure system LED flashes once and an audible warning sounds. Operate headlamp high/low beam switch to flash high beam position 5 times. Ensure system LED flashes once and an audible warning sounds. Programming mode activated: Press and release lock or unlock button on first key. Ensure system LED flashes once and an audible warning sounds to indicate correct programming. Repeat programming procedure for remaining keys. Switch ignition OFF and remove key. Close driver's door. Check operation of keys. Keys can also be programmed using diagnostic equipment.

: If a double audible warning sounds during the programming procedure a system malfunction has occurred. Repeat programming procedure.
Obtain all keys fitted with remote control. Open driver's door. Operate headlamp high/low beam switch to flash high beam position and hold. Insert key into ignition switch, turn to ACC position. Ensure system LED flashes once and an audible warning sounds. Operate headlamp high/low beam switch to flash high beam position 5 times. Ensure system LED flashes once and an audible warning sounds. Programming mode activated: Press and release lock or unlock button on first key. Ensure system LED flashes once and an audible warning sounds to indicate correct programming. Repeat programming procedure for remaining keys. Switch ignition OFF and remove key. Close driver's door. Check operation of keys. Keys can also be programmed using diagnostic equipment