Question about Sony CDX-CA750X CD Player

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Sony cd car stereo

Att (mute) function turns itself on and off constantly. Have you guys heard of this one?

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Re: sony cd car stereo

Your Cd Player has a cell phone mute wire (lt blue) to connect to a car kit.

You may have inadvertently connected it to something else, or the bare wire may be making contact with something causing it to engage the ATT (MUTE).

Best of Luck. 

Posted on Oct 27, 2007

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My Sony xplod car stereo keeps going off saying att on/off but the light blue wire for Bluetooth isn't connected to anything. Any suggestions?

Att is not your bluetooth. Its the attenuator. Reset the radio an see if it clears. Sometimes the processor loses itself an needs to reboot.

Jan 29, 2015 | Sony Car Audio Receivers

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What does att on mean?

att stands for attenuation. fancy name for mute basically.

Apr 27, 2010 | Pioneer DEH-P4700MP CD Player

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Display says ATT-

Disconnect the battery for an hour. This will reset the stereo and usually the problem will go away when you reconnect the battery.

Jul 20, 2009 | Pioneer DEH-P690UB CD Player

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I need a wiring diagram for this stereo

Pin Number Wire Color Function 1 White Left Front (+) 2 Green Left Rear (+) 3 Violet Right Rear (+) 4 Grey Right Front (+) 5 Blue/White Amplifier Remote 6 Blue Antenna Remote 7 Red Accessory 12 Volts 8 Black Ground 9 White/Black Left Front (-) 10 Green/Black Left Rear (-) 11 Violet/Black Right Rear (-) 12 Grey/Black Right Front (-) 13 Sky Blue Telephone Mute 14 Orange/White Illumination 15 Not Used Not Used 16 Yellow Constant 12 Volts

Pin Number Wire Color Function 1 Not Used Not Used 2 Black Ground 3 Grey Right Positive 4 Grey/Black Right Negative 5 Blue/White Amplifier Remote 6 Red 12 Volt Switched 7 Yellow 12 Volt Constant 8 White Left Positive 9 White/Black Left Negative

Jul 04, 2009 | Sony CDX-GT210 CD Player

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How do you get the Pioneer DEH-P670MP car stereo cd player off of mute?

hi there
to fix this press and hold the source button till unit turns off the source button switches from CD - radio...................once your unit powers and hold the function button down till the clock appears in display you should also hear a beep when this the function button repeatedly until the telephone feature appears now switch by pressing the skip button to ATT (Attention) once this is done press the source button to power on the pioneer unit simply turn up the volume and problem should be solved......
hope i was able to help

Feb 21, 2009 | Pioneer Premier DEH-P670MP CD Player

2 Answers

The unit will not play radio or cd.

Hi there dboy,

As a rule, Pioneer stereos are aftermarket installs. Any other equipment installed with it?

For example, do you have amplifiers in the trunk powering your system? If so, a malfunction there would explain things.

If not, we start with the easiest first.
  • Press the A button (Audio Adjust). This cycles through the various adjustments you can perform.
  • Make sure Balance and Fader are centered.
  • Volume is up above 10 or so.
  • And of course, Mute is off.
  • Press the F button to cycle through functions again. Any difference?
If there is an ATT (Attenuator) on your model press it. This is another form of mute (why don't they just call it Mute?).

If there is no change, make note of any digits, characters or symbols appearing on the face. I don't need the obvious items like station or CD Track. It's the non intuitive items. (what's that squiggle there mean?)

I know you've done this already, but ask the prime suspect again if he did anything, however innocent, just prior to the meltdown.

I'm pretty sure this is an Auto Equalize option on your model, I just can't swear to it though.

Ask if the term 'Auto Equalize' rings any bells. If he shows any recognition, come right back with, 'Did you do it without the microphone'? If he cracks under the pressure, let me know. The EQ settings may be way high (off the wall high) and the system is protecting itself by not making any noise.

Comment me back with your findings and a bit more about the configuration. We may need to go a few rounds before we end the sounds of silence


Jan 05, 2009 | Pioneer DEH-P2500 CD Player

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Stereo Sound

You could start by adjusting the Treble and Bass. The treble is what makes the high notes more nodicable, so if you turn the Treble up you should be able to hear more vocals. The Bass is what makes the low notes more nodicable, so if you turn the bass down you should be able to stop the shaking which I'm guessing is the low notes. On the other hand if you have an aftermarket radio then there might be a Mute or ATT button. Theses are for instant quiet, just repress the Mute or ATT button and it should be fine. I hope I could help.
-Andrew Hawkins

Apr 09, 2008 | Panasonic CQ-C1100U CD Player

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