I have a 2003 Chevy Silverado Ext Cab Z71, no sound is coming out

2003 Chevy Silverado 1500 Car Radio Wiring Diagram

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2003 Chevy Silverado 1500 Radio Wiring Diagram ; Rear Speakers Depth, 2 1/2? ; Rear Speakers Location, N/A ; Left Rear Speaker Wire (+), Brown ; Left Rear Speaker ...

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 .

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

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I had the same issue. Check fuse number nine.

in 1991 chevy used 3 differant trasmission's a 4L60-E, 4L80-E and a 700R4 in 1993 they used 2 differant transmissions a 4L60-E and a 4L80-E if your truck has the 700R4 then the 93 transmissions will not work if you ned to find out what you have in your truck and what is in the other truck. if they are the same they will swap the only diffance in the ext. cab and reg cab is the drive shaft. but the transmission have to be the same modles a 4L60-E will not replace a 4L80-E and nothing will replace the 700R4.

its right in line with fuel cap under bed

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.

sending unit on the fuel pump in the tank is stuck, and needs to be replaced. its expensive, but that will fix your issue. its the housing around the pump that has the float arm on it. you can try to free the float arm by removing your pump assembly, but cant guarantee its any good after being stuck