Question about Sony CDX-M800 CD Player

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Sub display screen

After starting my truck the other day, the sub-display screen and buttons quit working. they come on when the screen is closed and you can see them going off as the screen opens. I need Help!

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Re: Sub display screen

It's usually the flexible pcb that connects the fascia to the main board that needs replacing, because the fascia opens and closes each time the ignition is turned on and off the connector flexes and eventually some of it snaps, sometimes if you pop the trim off you can see the snapped pcb on the bottom right hand side of your radio

Posted on Dec 12, 2007

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I have a Kenwood kdc-mp342u car cd player installed in my truck. I have subs hooked up to it and everything was working fine until i had to reset my radio and when i reset it the "sub Level...

Subwoofer output: Hold the (AM-) button down for at least two seconds. You can do this function when "SWPRE" in is set to . The SWPRE (Switching Preout) Switches the preout between rear output ("R") and subwoofer output ("SW").

Nov 10, 2010 | Kenwood KDC-MP342U Car CD Player

1 Answer

Operation buttons and sub display are failing

go to ebay and type in the model number of the unit and it will bring up some part that can fix the problem. i had the same problem and i just ordered the part. its actually a ribbon connector. im sure you just open up the radio and take the old one out and connect the new one up. this seems to be a common problem with this unit. the ribbon just starts to tear, and as it tears, you will start to lose functions on the stereo. i happen to like this stereo, so i decided to repair it. good luck with yours.

May 31, 2009 | Sony CDX-M630 CD Player

1 Answer

Aux and sub settings

you have to turn the headunit off using the headunit (there is a button that says off or power just cant remember which one) once its off and is displaying only the time you hold the function button and all the other options will come up.

Jun 29, 2008 | Pioneer DEH-P6400 CD Player

2 Answers


What type of deck is it?

Mar 20, 2008 | Pioneer DEH-P6800MP CD Player

2 Answers

I can't find the button to turn on my sub!

im not exactly sure but if u press the EQ3 button a couple times once the xplod option is selected i think that is the setting that i designed for subs. Another possibility might be pressing the volume knob until the subs option is selected, might have something to do with that. The only other thing i can think of is making sure all of the wire connections are correct and properly connected, this is all i can think of because i just put this radio in my car a couple of days ago and have not put my subs in it yet so i haven't needed to figure this out yet. Best of luck.

Jan 14, 2008 | Pioneer DEH-P3600 CD Player

1 Answer

Amps and sub-woofer not working

Enter into the Audio Setup mode(press and hold volume button for at least 1 second). Next, repeatedly push the volume button until the display shows "2 ZONE". Make sure this feature is turned off. Hold the volume button again for at least 1 second to leave Audio Setup mode.

Now you need to make sure the Subwoofer Output is turned on. Do this by holding down(AM position) on the control knob(toggle stick) for at least 1 second. Each time the button is pressed, the Subwoofer Output is turned ON/OFF. the display should show "SW ON".

Next, you can go into Audio Control mode(press but do not hold volume button). Keep pressing on the volume knob until "Sub-WLevel" is displayed. Here you can adjust the amount of gain for the Subwoofer ranging from -15 to +15.

I hope this fixes your problem with it.


Dec 31, 2007 | Kenwood Excelon KDC-X789 CD Player

2 Answers

Powered Subwoofer won't work

This problem has many causes... but try this one... often when a faulty subwoofer speaker is to blame this test will tell you. Connect another speaker(any speaker) temp to check if there is audio still to the sub. Keep the levels down to ensure you dont go on a trail of destruction.
The spider wires from terminals on the speaker to the cone may be intermittent. I have seen this a lot on all types and makes of subwoofer driver!! This a common failure and can often be detected by tapping the speaker cone when it does the cut out thing. If it starts up, and they often do..., then you probably have intermittent spider wiring to the cone. A GOOD “Hi Fi speaker repair dood” can help here and replace the spider wires for you and save the expense of replacing the driver.
This is just one solution to the problem you are having.... there are many more..... and you should try this FixYa and see what happens. If you cant tell WTF then hit me back up here again. I work WITH YOU, to get the problem out for you.

If it sorted what you suspected... then rate me !FixYa!!.... Thanx

Dec 27, 2007 | Kenwood KDC-X590 CD Player

1 Answer

Can't get to turn the sub On-Off

I had the same problem. The people at Kenwood are idiots when it comes to writing instructions. What you have to do is go to standby mode, hold the menu button until the menu displays. Now, scroll down to where it says "Rear." Push the control knob to the right. Now you have the ability to turn your sub on and off. Once that's done, just go back to CD or Tuner, push the knob down, hold for the two seconds, then it should say "On Sub." It took me a while to figure this one out.

Aug 28, 2007 | Kenwood KDC-135 CD Player

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