How to reset your Sony car stereo (CDX, MEX, or DSX Series)

When should I reset my car stereo?

Resetting your Sony car stereo can help resolve issues such as unresponsiveness, audio glitches, or Bluetooth connection problems. It is also recommended under the following conditions:

1. Before using your car stereo for the first time.
2. After replacing your car battery.
3. After changing the connections or wiring.
4. If your car stereo malfunctions.

Before you do a reset

1. Data loss warning: Performing a reset will erase clock settings, radio presets, and some stored content.
2. Model variations: Some models do not have a dedicated reset button. Check your manual to confirm which buttons to use for resetting.

Reset methods by car audio model type

How to reset a car audio system without a dedicated reset button

If your car stereo does not have a reset button, use one of the following button combinations (varies per model):

• Press and hold DSPL and (Back)/MODE for more than two seconds.
• Press and hold DSPL and CALL for more than two seconds.
• Press and hold SOURCE/OFF for more than two seconds.

After pressing the correct combination, turn your car stereo back on to check if the reset was successful.

How to reset a car audio system using the dedicated Reset button 

If your car stereo has a designated RESET button, follow these steps:

1. Remove the faceplate from your car stereo.
2. Press the RESET button on the front panel using a pointed object, such as a ballpoint pen or paperclip.
3. Reattach the faceplate and turn on the stereo.

Note: These steps apply to in-dash car stereos with removable faceplates. Some models may have slight variations, so consult your manual if needed.

How to factory reset via the menu (for models with a display)

Some MEX and DSX models allow you to reset through the menu:

1. Turn off the unit by holding the SOURCE or OFF button.
2. Press and hold the MENU or SETUP button until the settings menu appears.
3. Navigate to “Factory Reset” or “Initialize.”
4. Select “Yes” and confirm the reset.

The unit will reboot and restore factory settings.

Resetting Bluetooth Settings (BT initialize)

If your stereo has Bluetooth connectivity, you may need to reset Bluetooth separately:

1. Enter the settings menu (varies by model, typically by pressing MENU or SETUP).
2. Select “BT Initialise” and confirm.
3. Restart the stereo to apply changes.

If Bluetooth connectivity issues persist, try forgetting the device on your phone and re-pairing after performing a BT Initialise.