Question about 1990 Volvo 240

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When I press any button on the stereo, the screen displaya "code." Also the volume is very very low, is this just because the stereo needs to be unlocked?

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  • 71 Answers

The security system for the audio has been tripped. If you have the security code, you can enter it. Otherwise you will have to call a dealer and have them reset for you unless you can convince them to give it to you over the phone. You will need your VIN when you call them.
Good luck.

Posted on Sep 11, 2009

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Posted on Jan 02, 2017

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Normally a bad wire/plug on sensor or sensor faulty.
Check the attached links,instruction and guides to explain codes in more detail. Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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Code for a 2002 ford focus


Type in the 6 digit serial number then press button 5 on radio 'calculate code' to close the program press the volume button 'close program' to clear the serial press the seek button

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Need the code for mobis hm 3700


I have a Kia Carnival 2005 KVII. I had to contact Kia to get the radio code and give the vin number. Note # you will only get 3 attempts.
My Kia has a Mobis HM3700 and the Code I was given is 1812.

To insert code:
1 look at the front of the Radio you will see a screen, and at the bottom of the Right hand side is a set of channel select buttons.

they look like this
1 2 3
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Each button from button number 1 to number 4 will cycle through from 1, 2, 3, 4, 5, 6, 7, 8, 9, to 0 each time you press these buttons you will change the number on the screen.

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I have a 2008 ford ranger xlt 4x4 4.0 truck. we changed the motor and sense the battery was disconnected the anti theft system locked down how do we unlock it.


follow this steps and fix it. God bless you

Turn the vehicle on. The engine does not need to be running but the ignition should be on to power the stereo.


  • 2 Press the "Source" or "Power" button to turn the unit off.


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  • 3
    Press and hold down the "Minute" button (located to the left of the GM vehicle stereo's display. Some models require pressing and holding the left arrow button if no "Minute" button is present.) Release the button once the display shows "0000."

  • 4
    Press the "Minute" button (or left arrow) to set the value of the third and fourth digits of the anti-theft code. Release the button once the proper value for the last two digits is displayed.

  • 5
    Press the "Hour" button (or right arrow button) to set the first and second digits of the code. Release the button once the four-digit code is accurately displayed.

  • 6
    Press the "Mode" button to lock in the code you set. Turn the stereo deck on by pressing the "Source" or "Power" button to complete the reset.


  • Read more: http://www.ehow.com/how_6924001_reset-anti_theft-code-car-stereo.html#ixzz2gZHpH2aT

    Oct 02, 2013 | 2001 Ford Ranger Regular Cab

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    How to unlock radio from a2001 chey cavalier


    see this technique and fix it. God bless you
    Instructions
    1. With the Unlock Code
      • 1 Locate the anti-theft/unlock code. Most cars have a special anti-theft radio card that is included with the owners manual packet containing the unlock code and serial number. Some cars also have the code in the car manual or inside the glove compartment. You will need this code in order to unlock your car radio.
      • 2 Turn the car's ignition switch to the "on" position. This turns on your car's electrical system and powers up the radio. The word "CODE" will display on the screen. Note: depending on the manufacturer some radios will display either "ENTER" or "LOC" on the screen instead.


      • 3 Enter the anti-theft/unlock radio code. Press the "Tune" button on your stereo. It will change the screen from "CODE" to blank. Press the button to scroll through the available numbers. When you reach the correct number press the button once and hold it down for a few seconds. The number will appear on the display and you can now repeat the process to input the second number, third number etc., until all of the numbers are in. If you entered the code correctly the car stereo will unlock and instantly become functional. Depending on your car manufacturer, if you enter the code incorrectly you will not be able to re-enter it again from 1 to 24 hours.
      Without the Unlock Code
      • 4 Call your car manufacturer directly. Your car manufacturer's phone number is in your owner's manual. Ask to be connected to the support department. Tell them you need to reactivate you car stereo and you will be asked for proof of ownership. They will need your car's VIN number, the account number from your bill of sale and a form of personally identifiable information like your driver's license. You may need to fax this information. Once everything checks out the manufacturer will give you the code.
      • 5 Enter the code and unlock your stereo. Use the code you received from the manufacturer to unlock and and activate your car stereo.
      • 6 Go to a car dealership. Take your car to its manufacturer dealership to get the stereo unlocked. For example, if your car is a Honda go to a Honda dealership. Once you have proven that you are the owner of the car, the dealership will be able to retrieve the code from the manufacturer and activate the radio for you.

    Oct 04, 2012 | 2001 Chevrolet Cavalier

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    Dead Battery equals Stereo lock


    You must get the 4 digit security code and enter it into the radio by pressing the AM and FM2 buttons at the same time. Then enter code via the preset buttons. Press button #1 until you get the first digit of the code then press button #2 until you get the 2nd digit and so on for the 3rd and 4th digits. when code is on the display press the AM and FM2 buttons again and radio should come back on. if it reads safe you have the wrong code #. You can get the code from a dealer for a small fee. They need to remove the radio to get a serial # on the radio chassis.

    May 27, 2009 | 1998 Audi A6

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    Stereo dont work


    You have to have a dealer or authorized repair facility contact the mfr to get the code. you will more than likely need proof of ownership.

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    Press and hold SCAN and RDS. 1000 will appear and you can enter your code using the station buttons 1-4 to set the digits.

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    Locked out of my car stereo


    To enter the code, press the minute and the hour buttons on your stereo! If you have problem or forget your code, there you'll have to hold down the AM/FM button until another code shows up. You'll then have to phone a 1-800 number, enter the authorization code, followed by the code from your CD player.

    If this is the case, let me know and I'll get you the numbers!

    Jul 20, 2008 | 1997 GMC Jimmy

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