2004 Tahoe Radio Died

[raddog6]

Good afternoon. Yesterday I experienced the following in my 2004 tahoe, 65k miles.

 

Started car, radio did not play, lights on, station presets still there, no volume, no signal when scanning, no audio from CD player with CD moving thorugh tracks.

 

Drove home, when turning off car heard a clicking noise and what sounded like a pump actuating under the hood. Lifted the ood and heard same nosie louder.

 

Let sit over night and Radio works and engine noise gone.

 

Took to dealer they said was possbily the alternator or electrica turnig off amp in accessroies when electric systems failing?

 

Any ideas?

[GM-Tech]

Not enough info on the engine noise to even guess, but it seems that it would be unrelated to the radio problem. See if this helps...

 

 

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Subject: Diagnostics for No Sound from Speakers But Radio Display is Operative - keywords amp amplifier audio radio RSA volume #PIT3193A - (11/25/2005)

 

 

 

Models: 2003-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe

 

2003-2006 GMC Sierra, Yukon, Yukon XL

 

2004-2006 Hummer H2

 

With UQ7 without Y91

 

 

 

 

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

This information is in addition to the normal no audio diagnostics which includes checking for shorted speakers or speaker wires.

 

Recommendation/Instructions:

For complaints of no audio from vehicle equipped with a non-class 2 amplifier, perform the following checks to determine if it is a radio or an amp issue. Do these checks with vehicle running, radio on and amp plugged in.

 

Check for audio at the Rear Seat Audio controls through the head phones. If there is, then the radio is producing audio.

 

Check pin B3 (switched 12 volts) for 12 volts. This is a radio output that tells the amp to turn on. It should show 12 volts, if it does not, and then radio B3 pin output is not operating properly. This could be caused if the radio is not programmed correctly or a circuit concern.

 

Check pin B6 (amp mute) for 0 volts to 5 volt. If the voltage is between 0 and 1 volt this tells the amp to unmute and play. If it shows between 3 and 5 volts this tells the amp to mute and stop playing. This could be caused if the radio is not programmed correctly or a circuit concern.

 

If the above steps indicate that the system should be playing then check for power and grounds to the amplifier and if ok, replace the amplifier.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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