Audio on radio and bluetooth dissappears.

The 2015 Nissan Altima does not have a mute button for the Audio system. To unmute the Audio system You will have to turn the volume knob clockwise. If this does not fix the problems with the Audio in the vehicle You can try and attempt a full reset of the radio in Your car. To do this You will turn the ignition key to the "on" position and turn Your radio on, wait ten seconds and then turn Your radio off. Depress the radio power button again and wait for reset. Alternatively, enter Your dealer provided radio code to reset. You can also check to see if You had a call and if You did not press the "call hang up" button on the steering wheel while not on a call it could mute the radio so press it again to un mute it.

Try to reset to factory reset through RESET button on device. Normally it's the POWER button. Press and hold the power button for approximately 10 seconds, your device will reboot.

Keep disconnect the car's battery for a longer period of time to ensure that the radio's memory is fully cleared. Be sure to have the car's security code on hand, as it may be required to reactivate the radio after reconnecting the battery.

If none of these steps work, there may be an issue with the radio's hardware or software that requires professional repair. It's best to have a qualified mechanic or car audio technician diagnose and repair the issue.

Question edited for clarity.
Question moved to model category.

It appears to be a software error that only the dealership or an auto electrician can fix!

https://www.google.com/search?q=2002+trailblazer+radio+cal+error

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Which of these does your truck have ?
The Entertainment System on this vehicle is configured with a radio, antenna, and speakers.
The following list shows the radios available for this vehicle:
• Radio (UM7) - AM/FM with Cassette
• Radio (UB0) - AM/FM with CD
• Radio (UB1) - AM/FM, Cassette and CD
• Radio (UC6) - AM/FM, Integral Multi Disc CD Changer
Audio Amplifier
The audio amplifier is standard on some vehicle lines but is optional on most. The radio supplies low level audio signals to the audio amplifier in order to boost the signal sent to the speakers. The class 2 signal circuit allows the radio to recognize that an amplifier is present. Once the radio detects an audio amplifier, it will output low level audio signals. The audio amplifier is turned on when it receives a message via the class 2 serial data circuit indicating that the radio is on.
Digital Radio Receiver
The radio communicates with the digital radio receiver via the class 2 communications circuit. The digital radio receiver sends low level audio signals to the audio amplifier.
Steering Wheel Controls
Some audio functions are available using the steering wheel controls. The steering wheel controls consist of multiple momentary contact switches that connect a series of resistors. When a steering wheel control button is pressed, a specific resistance value is noted by the body control module (BCM). This results in a generated voltage, unique to the particular button. The BCM alerts the radio that the button has been pressed, and the radio responds, just as if the corresponding radio front panel button had been pressed.
Amplifier
The amplifier in early build vehicles is a class 2 device that communicates with the scan tool on the Class 2 bus. The Class 2 amplifier will set a U100 in the radio if there is a communication problem. The late build vehicles have a NON-Class 2 amplifier that does not communicate over the Class 2 bus and therefore the NON-Class 2 amplifier will not set codes. Both amplifiers have similar operating characteristics, therefore, there are not separate diagnostics for the NON-Class 2 amplifier.
Circuit Description
When the radio is powered up, the radio supplies low level audio signals to the speakers. If the vehicle is equipped with an audio amplifier, the amplifier will boost the signal sent to the speakers. The radio tests the speaker output circuits for a short to voltage or ground.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
• DTC B1025 Audio Output 1 (Left Front) Circuit
• DTC B1035 Audio Output 2 (Right Front) Circuit
• DTC B1045 Audio Output 3 (Left Rear) Circuit
• DTC B1055 Audio Output 4 (Right Rear) Circuit
Reduced Volume - One or More Speakers
Step
Action
Yes
No

Schematic Reference: Radio/Audio System Schematics

1
Did you perform the Diagnostic System Check - Vehicle?
Go to Step 2
Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
Turn ON the ignition, with the engine OFF.
Turn ON the radio.
Adjust the radio balance and fade controls to each speaker.
Do all of the speakers operate properly?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3
Turn the ignition ON, with the engine OFF.
Adjust the volume level.
Test the appropriate speaker output circuits of the radio for A/C voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did the A/C voltage fluctuate with the audio output?
Go to Step 4
Go to Step 8

4
Turn OFF the ignition
Disconnect the radio.
Test the appropriate speaker output circuits of the radio for high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 5

5
Inspect for poor connections at the harness connector of the radio. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 6

6
Inspect for poor connections at the harness connector of the appropriate speaker. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 7

7
Replace the speaker. Refer to Speaker Replacement Reference .
Did you complete the replacement?
Go to Step 9
--

8
Replace the radio. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 9
--

9
Operate the system in order to verify the repair.
Did you correct the condition?

Faulty audio unit failing to load , needs repair or replacement .

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Chevrolet

You need an adapter that connects to your car radio and allows USB and Bluetooth connection! Go to local car audio specialist!

bad wiring
if stock ? its not normal
if aftermarket , typical.
can be loose fuse.
or bad connections to the head or amp.
did you lose all sources?
CD/ AUX mp3, radio, am/am, all mode fail?
or just one, this is key to what bad.
if lamps go dead.
or just front or back speakers go dead.

I had the same problem. Everything worked except the sound. There is a small button next to the CD player that is a reset button. Press that and the audio came back. You have to reset your presets but at least the sounds works.

there are alot of variables for bluetooth. Type of phone, phone service and provider etc... what type of phone are you using here is just one of the latest post from gm.

#PIC5504: Intermittent Bluetooth Issues With Apple IPhone 4 - (Jul 13, 2011)
Subject: Intermittent Bluetooth Issues With Apple iPhone 4 Models: 2008-2011 All GM Passenger Car and Light Duty Trucks with RPO (UPF or UWE)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:A customer may report of intermittent Bluetooth issues with their Apple iPhone 4.
Recommendation/Instructions:An issue with intermittent Bluetooth disconnects between the iPhone 4 and some GM vehicles has been identified. You may experience no audio in the vehicle for incoming and outgoing calls. When this occurs the Bluetooth system will say "Unable to place call on your Bluetooth phone". GM and Apple engineering groups are currently working on a resolution. The PI and GM Bluetooth website will be updated as soon as more information becomes available.
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.