20 Most Recent Sony XPlod CD Player w/MP3 Playback CDX-GT40W Questions & Answers

I had the same problem with my sony CDX-GT540UI and solved it! I just kept clicking the "source/off" button when the display was showing the demo and suddenly it started switching to USB/CD/AUX etc. This means that the contacts inside the micro-switch were stuck in the down position, continuously making contact, and blocking the signals from the other buttons. Have to replace the micro-switch now.

While the head unit is off press and hold in the volume or source (SRC) button it will bring up a menu with different options go to demo mode and turn it off hopes this helps thanks Jeff J&D services

It sounds like you are using the blue wire (power antenna remote turn on) instead of the blue/white wire ( amplifier remote turn on) to turn your amp on. The power antenna remote turns off when leaving tuner mode.

You enter a code on the source device, enter the code again on the head unit (using the remote control is the easiest way to do so), and the two devices connect.

To set the clock:

Press and hold the select button until the setup display appears.

Press the select button repeatedly until "CLOCK-ADJ" appears

Press SEEK + (the hour indication flashes)

Rotate the control dial to set the hour and minute. (To move between hour and minute, press SEEK + or -)

After setting the minute, press the select button and the setup is complete.


To display the clock, press the DSPL/SCRL button.

use the blue/white wire (amplifier remote turn on) to turn the amp on instead of the blue wire (power antenna remote turn on). the blue wire turns off when leaving tuner mode.

You can get the manual from Sony.

are you using an amplifier? if so, it sounds like you are using the blue wire (antenna remote turn on) instead of the blue/white wire (amplifier remote turn on) to turn the amplifier on.

do you mean the blue light on the power button? it sounds like your radio's switched power input (usually red) is hooked up to a 12 volt constant source.

Possible solution: Check to make sure your ground connection is connected to metal that is NOT covered in paint. This is not a solid connection and can ruin your amp over time. Simply scrap away the paint and re-connect. This was a problem i ran into recently.

this seems to be a wiring problem. get a technician and have the wiring check.

The sub outputs are simply lowpass filtered preamp outputs for use with a subwoofer amplifier. They supply a lowpass filtered signal for a subamp or 'powered subwoofer" like a bazooka tube. Test your "basstube" for 12 volt input power and make sure the "sub" setting on the radio is turned up too.

Switch your blue wires around.

You have put the remote antenna wire to the remote turn on of the amplifier. The radio cuts off the power to the "power antenna" when you switch to a different mode... so your amplifier is now losing the turn on signal it requires to stay on.

Simple 2 minute fix.

Thanks for using FixYa - a FixYa rating is appreciated!!