Gmc yukon speakers not working

Gmc yukon speakers not working DEFAULT

I think we need more info before making any kind of assumptions.

1.) Does the vehicle still have the factory amplifier for the door speakers?

If it has a Bose system it has a factory amp, and if the setting is incorrect on the radio, it will not send the right signal to the Bose amplifier as the stock head unit does. Look in the sound settings and find the selection for amplifier. If it is off, turn it on. If it is on, turn it off. I can't recall which works with or without a factory amp. One setting allows the headunit amplifier to control the speakers, the other bypasses the headunit amp and uses the factory.

2.) Does the custom amp under the rear seat power a subwoofer?

If it powers a subwoofer, look at the connections to see if it is only powering a subwoofer. If it does, you should see a set of speaker wires coming from the amp equal to the number of subs you have. There shouldn't be more than that.

2.) If the answer to question 1 is "no", the amp setting on the radio is set to "ON", and the amp under the backseat powers ALL of the speakers (verify by multiplying the number of wire sets times the number of speakers in the vehicle), then there are a couple of possibilities. Either the pigtail wiring is incorrect, the amp remote power wire is not connected properly, or the head-unit itself is faulty.

I'd bet it's a simple fix.


Last edited by Nlambert; 12-08-2015 at 11:50 AM..

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Rear speakers not working

Truck is a 1998 two door Tahoe with the two roof mounted speakers in the back.

They aren't working.

The previous owner must have had an amp or something in the back, so I'm trying to figure out how to undo what he did.

He tapped into the rear speaker feed and return lines at the radio and ran them through a line converter. He didn't cut the factory wires, just spliced into them.

He also tapped into a pink wire at the radio with a blue wire. From the line converter, he ran two speaker wires to the back. The blue wire goes along with them.

The pink wire at the radio is labeled "radio on signal" which looks like it switches the factory power amplifier relay.

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So how do I undo this and get sound back to the rear speakers? Just take out his splices and reseal the factory wires?

The rear speakers are still there and connected, so it doesn't look like he disrupted the wiring up in the headliner.


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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

_________________________________________________

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.

______________________________________

Let me know what you find or if this helps.

Take care,
Joe

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Wednesday, December 11th, 2019 AT 7:40 PM

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2007 GMC Yukon Denali Radio Fuses

Location of radio amplifier?

Rick McAninch, you did not give us a lot of information about which year your Yukon is or which amp. I assume it has the Bose system. Should be inside the center console, just pull the cup holders up to see if it is there.

AMPLIFIER REPLACEMENT

REMOVAL PROCEDURE

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.

8. Remove the 4 screws retaining the upper console bracket to the lower console bracket.

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

12. Move both front seats to the fully rearward.

13. Remove both front console side panel screws (1).

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.

Hope this helps, good luck.

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