Volume control on in-dash unit not working properly

Sounds like the infra-red sensor inside it is either damaged or it do not get proper voltage to work. Check it. If it get proper voltage/s and still not receive any infra-red signal from the remote control, replace it. The part in discussion will look somewhat like this.



Prior the replace this component, make sure that the remote control you're using works properly, and do emits infrared light rays, during each button presses on it. Check the remote control for its infrared emission. Check it with fresh batteries. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Clean the contact surfaces inside according to: https://www.youtube.com/watch?v=lNW3IlnG9ak
Worked for my P580 volume control unit.

There is no control for this in the TV. You must do it with the volume control of the external amp.

sounds like you need to take it in to have it looked at. no simple fix unless you are an appliance technician. hard to walk a beginner through. i suggest calling an stereo repair guy.

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Hi, the mode switch is actually vacuum operated, so it isn't a fuse. The usual failure mode is a loss of vacuum supply due to a leaky hose, but the mode switch may also have developed a leak. Look for a thin plastic vacuum line that runs for the engine intake manifold thru the firewall to the climate control panel. Check the connection to the intake manifold--it is usually a rubber hose stub that can get brittle and start leaking. If that is good trace the plastic hose into the truck and to the control panel. There may be a "T" near the panel that can also leak. Start the truck and listen for vacuum leaks near the control panel. Below are instructions for removing the control panel. If there is vacuum to the control panel and the swich is not leaking, the problem may be with the mode door actuator. Trace the plastic vacuum lines from the control panel to the vacuum actuators on the mode doors and check to make sure the actuators are not leaking vacuum when the mode selector is changed. Please let me know if you have any questions, and thanks for using FixYa.

1. Disconnect the negative battery cable.
   
2. Carefully pry to release the four clips retaining the center instrument panel finish panel.
3. Detach the two passenger air bag defeat switch electrical connectors.
4. If equipped, detach the 4WD control switch connector.
5. Remove the center instrument panel finish panel.
6. Remove the climate control assembly retaining screws.
7. Pull out the climate control assembly.
8. Detach the electrical connectors.
9. Detach the vacuum line connector.
10. Remove the control panel. To install:
11. The installation is the reverse of the removal.

First, does the machine stop filling if you pull the plug? If not, he is wrong and you need the fill valve. The piece the hoses go into. If it does stop when plug pulled then he is likely correct.

Pull machine away from the wall. Disconnect power. The control panel has two plastic end caps. The rear edge of each end cap will show a hole which has a partially covered Phillips head screw in it. Put a screwdriver in and remove the screw in each end cap.

Move to the front of the washer. Grasp each end cap and pull straight toward you about 1/4 " to 1/2 " then lift. The control panel should disengage from the top of the machine. The top of the control panel stays attached to the back plate of the washer. Rotate the front of the control up. This will expose all parts in the control panel.

Look for a 1/4" clear hose coming from inside the machine to one of the switches. This small hose can become detached from the switch and not send the "full" signal to shut the water off. It may also develop a small air leak which prevents the signal. If the hose is detached...reattaching and adding a hose clamp will prevent future detachment. if not detached, the pressure (level) switch itself is likely the problem.

Reverse the above process to reattach the control panel. If the machine is full spin to empty before testing your repair to remove water from tube. Good Luck.

Either the potentiometer which sits behind the user knob has got a broken track or it is full of debris

You can buy a tin of Servisol switch cleaner (or similar, make sure it has a lubricant in it and that propellant does not harm plastics) take off the knob and give it a good squirt where the spindle of the potentiometer enters the cabinet

Give the spindle a few full rotations and another dose of cleaner , then give it a try

It is best if you take a cover off and apply the cleaner direct to the potentiometer

this is caused by a internal fault in the display and a very common issue with this dash and many ther GM cars from 86-90's, u can buy a rebuilt dash or have yours repaired, I have a number u can call and talk about your problem and get it repaired if u so desire

Toll free Number 1-888-803-8523 if you have any questions or to make shipping arrangements

remove the face plate again, in the lower right of the unit there is a tiny reset button (paperclip or pen required) press this button and see what happens this will reset all of your radio stations, audio settings and such, but if it works, may save you a trip to your local repair depot.. if this does not work, you probably need to take it to your local repair depot.. hehe