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My radio appears to be working, everything except audio output. What I mean is that the controls seem to be working, it appears to tune, seek, volume, treble, and bass controls indicate they are working, the bands change, the CD changes disks, changes tracks, indicates CD is playing, but no audio. Except that once in a while, the audio come on for one or two seconds, and then off again. I thought it might be a loose wire, so I removed the radio (not the cables) and wriggled the cables for several minutes with no effect. Re-installed and still nothing. Another anomaly is that the radio on/off switch appears to be reversed, off when pushed in and on when out.
Is there an external amp that could have a problem or is this radio self contained?
You would need to take the radio out of the car and open it up. Then, if you are good with a soldering iron, you could re-flow all the questionable solder joints. If you do not have a soldering iron, or are not good with one, you should just take it to a service center for repair. Since it does work at certain times, the amp is good, it just has some bad connections. The amp IC it always located on a heat sink inside the radio. That would be the first place to look. You may even have 2 amp IC's in the radio. One for rear and one for front speakers. Any solder joint that has a ring on it or looks cracked, or is not a shiny silver color are all suspect.
You would need to take the radio out of the car and open it up. Then, if you are good with a soldering iron, you could re-flow all the questionable solder joints. If you do not have a soldering iron, or are not good with one, you should just take it to a service center for repair. Since it does work at certain times, the amp is good, it just has some bad connections. The amp IC it always located on a heat sink inside the radio. That would be the first place to look. You may even have 2 amp IC's in the radio. One for rear and one for front speakers. Any solder joint that has a ring on it or looks cracked, or is not a shiny silver color are all suspect.
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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?
If the radio display and functions seem to working normally, except for the zero sound output, the problem could be at the audio amplifier circuit, wirings and the speakers. This may be the case if you have the bose audio system installed. This system have two 15 amp fuses at the fuseblock in the engine compartment. You can begin the checks from there. But if the system is the non-bose audio system, the radio unit itself should be thoroughly investigated.
Look on ebay for an REC Joystick replacement. In the mean time you can hold down the middle button on the right side of the back of the steering wheel, where you can control the radio features. When you hold this button down, a little red wheel symbol appears on the navigation screen which means you can control the navigation system from the steering wheel controls. This works for simple tasks until you get the replacement joystick. They are about $30 and take about an hour to install.
if you dont get even a pop or crack when turned on at first, check the radios memory on the read-out on the radio face and see if its on mute setting, and if this is not the case, there are 2 fuses,one controls memory power and the other controls audio output power, check both as if one fuse is out the other cant make the radio operate properly
The actual problem may be with the radio itself in the preamp circuit or the cabling from the radio to the amp. Since you are getting output from the Sub, that means the amp has power and so does the radio. However, the standard audio line is usually seperate since the selection of speakers is controlled from the radio itself and the sub is constant except for volume
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