No sound out my speakers

Hi,

If the radio is on, then my first suspect is either a fuse to the amp or the amp has failed. Take a look through these directions for replacing the amp. Locate it in your vehicle and confirm nothing is disconnected or damaged. Also, make sure there is power to it.

If you look at the last pic below, it shows the fuse box under the hood. I highlighted the amp fuse. It is a 30 amp fuse.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

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2004 GMC Truck Yukon/Denali 2WD V8-5.3L VIN T
Amplifier Replacement
Vehicle Accessories and Optional Equipment Radio, Stereo, and Compact Disc Amplifier Service and Repair Procedures Amplifier Replacement
AMPLIFIER REPLACEMENT
AMPLIFIER REPLACEMENT

REMOVAL PROCEDURE

pic 1

1. If equipped with a Bose(TM) amplifier, remove the radio amp fuse located under the hood electrical center.
2. Remove the floor console bezel.
3. Remove the cupholder.
4. Remove the bolts (1) retaining the console to the instrument panel (I/P).
5. Remove the console storage bin.
6. Remove the center console end panel.
7. Disconnect the audio amplifier electrical connectors.

pic 2

8. Remove the 4 screws retaining the upper console bracket to the lower console bracket. The front 2 screws (1) are shown in the graphic.

pic 3

9. Move both front seats to the fully forward.
10. Reposition the inboard seat track trim (1) in order to gain access to the rear console side panel screw (2).
11. Remove both rear console side panel screws.

pic 4

12. Move both front seats to the fully rearward.
13. Remove both front console side panel screws (1).

pic 5

14. Disconnect the floor console electrical connector.
15. Remove the console assembly from the vehicle.
16. Remove the audio amplifier screws (1).
17. Remove the audio amplifier from the vehicle.

INSTALLATION PROCEDURE

pic 6

1. Install the audio amplifier to the floor console lower bracket.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the amplifier screws.

Tighten the screws to 3.4 N.m (30 lb in).

pic 7

3. Install the floor console.
4. Connect the floor console electrical connector.
5. Install the screws (1) that retaining the upper console bracket to the lower console bracket.

Tighten the retaining screws to 2 N.m (18 lb in).

pic 8

6. Install the bolts (1) retaining the console to the I/P.

Tighten the bolts to 4 N.m (35 lb in).

pic 9

7. Install both front console side panel screws (1).

Tighten the screws to 2 N.m (18 lb in).

pic 10

8. Move both front seats to the fully forward.
9. Install both rear console side panel screws (2).

Tighten the retaining screws to 2 N.m (18 lb in).

10. Reposition the inboard seat track trim (1).
11. Connect the audio amplifier electrical connectors.
12. Connect the floor console electrical connector.
13. Install the center console end panel.
14. Install the console storage bin.
15. Install the cupholder to the console.
16. Install the upper console bezel.
17. Install the radio amp fuse.
18. If the amplifier has been replaced, perform the audio amplifier set up procedure for the BOSE(TM) amplifier with UQ7 and Y91. Refer to Audio Amplifier Setup.

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Let me know what you find or if this helps.

Take care,
Joe