I have a 96 geo prism and the radio shows loc I pushed the 2&3buttons and 9871 appears but when I push the am/FM button it shows loc again

ENTERING SECURITY CODE

Most vehicles are equipped with Heidelberg V or VI radios that are equipped with a theft protection program. When the battery has been is disconnected or if the radio has been removed, the radio will lock-up electronically and cannot be operated until the security code is entered. On the Heidelberg V, if the proper code is not entered in six attempts, the radio will lock-up permanently and cannot be repaired. On the Heidelberg VI, two incorrect attempts will lock the radio for about 1 hour.
The Heidelberg V may have a code assigned at the factory or a personal code created by the owner. The Hiedelberg VI has a code assigned at the factory and entered by the dealer during pre-delivery inspection. New radios come with the code printed on a sticker but not entered into memory. All codes are 4 digits. To code the radio:
Heidelberg V

1. Turn the radio ON . The radio should display the word SAF. DO NOT attempt to eject a cassette with the radio in this mode.
2. Push the AM/FM and SCAN buttons at the same time and hold them until the display changes, then release them immediately. The number 1000 will appear for about 3 seconds, then the display will go blank. Release the buttons then.

NOTE If the buttons are held too long, the radio will interpret this as an attempt to enter an incorrect code.

1. Use the first four station selector buttons to enter the code. The first digit of the code is always 1. Each time the other buttons are pushed, the number in that position will change.
2. When the code appears correctly in the display, push the AM/FM and SCAN buttons at the same time. When the radio plays and displays a frequency, release the buttons.
3. If the code was entered incorrectly three times, momentarily disconnect the battery and try again. If the code is entered incorrectly three more times, the radio cannot be coded and cannot be repaired.

Heidelberg VI

1. Turn the radio ON . The radio should display the word SAF. DO NOT attempt to eject a cassette with the radio in this mode.
2. Push the AM/FM and SCAN buttons at the same time and hold them until the display changes, then release them immediately. The number 1000 will appear and remain in the display.

NOTE If the buttons are held too long, the radio will interpret this as an attempt to enter an incorrect code.

1. Use the first four station selector buttons to enter the code. Each time a button is pushed, the number in that position will change.
2. When the code appears correctly in the display, push the AM/FM and SCAN buttons at the same time. When SAF appears in the display, release the buttons. The radio should play and display a frequency.
3. If the code was entered incorrectly two times, leave the radio ON for one hour and try again. This can be repeated as often as required.

How to Reset GM Theft lock Radio's
Article Disclaimer: This article is meant to be used by Delco Radio owners to reset there radios. In no way is it meant to be used for any unethical or unlawful ways.

Purpose
The following instructions will allow you to reset any GM (General Motors), Cadillac, Oldsmobile, Buick, Pontiac theft lock radio.

Requirements
The theft lock radio must be in "LOC" mode.

Procedure:
1. Turn the ignition ON (The radio should display "LOC")
2. Hold down the Radio Presets 2 and 3 buttons for six seconds
3. The radio display changes from LOC to a three-digit number. Write this number down. You now have fifteen seconds to complete the next step.
4. Press the AM/FM button
5. The radio display changes to another three-digit number. Write this number to the right of the first one
6. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05
7. Call 1-800-537-5140
8. Press 1 then # (pound). You'll hear "Invalid Code, try again"
9. Press 139010 or 106010 or 206010 or 202107 then # (pound). You will be asked to enter your four or six digit code followed by *
10. Enter the number from STEP 6 then *
11. Listen to the four-digit number and write it down. It will be repeated twice
12. Turn the ignition ON (The radio displays LOC)
13. Use the MN and HR buttons to enter the code from STEP 11
14. Press the AM/FM button. The radio display changes to "SEC". Your radio is now "un-locked" and usable.

Dealership Codes
139010
106010
206010
202107

Troubleshooting
If you fail to enter the correct code eight times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode.

To Read the original article or read similar articles please visit kingbain.com/how-to/unlock-gm-theftlock-radio-s

Good luck (remmeber comment and rated this).

you turn the ignition to acc or on and use the hour and min buttons to enter the 4 digit code if you are not the original owner it may be written down in the owners maual. if it is not written down it is possible a code was not assigned in this case it will be all 0's and you just need to push the power knob. if it says sec. then you have successfully unlocked the radio if not you will need to go to the dealership so they can unlock it. or you can try this

1. Turn the ignition ON (The radio should display "LOC")
2. Hold down the Radio Presets 2 and 3 buttons for six seconds
3. The radio display changes from LOC to a three-digit number. Write this number down. You now have fifteen seconds to complete the next step.
4. Press the AM/FM button
5. The radio display changes to another three-digit number. Write this number to the right of the first one.
6. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05
7. Call 1-800-537-5140
8. Press 1 then # (pound). You'll hear "Invalid Code, try again"
9. Press 139010 or 106010 or 206010 or 202107 then # (pound). You will be asked to enter your four or six digit code followed by *
10. Enter the number from STEP 6 then *
11. Listen to the four-digit number and write it down. It will be repeated twice
12. Turn the ignition ON (The radio displays LOC)
13. Use the MN and HR buttons to enter the code from STEP 11
14. Press the AM/FM button. The radio display changes to "SEC". Your radio is now "un-locked" and usable.
Dealership Codes

• 139010
• 106010
• 206010
• 202107

Troubleshooting
If you fail to enter the correct code eight times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode.

turn ignition switch ON but leave stereo OFF---press MN button and OOO should appear -----press HR button to make the last two numbers match your code then release button ---press hr button until the first one or two numbers match ur code ----press AM/FM SEC should appear indicating the radio is unlocked if LOC shows up either took longer than 15 seconds between entering codes or wrong code entered --u r allowed only 8 tries after that radio becomes INOP and dealer is only one able to reset

Hi

Thanks for using FixYa. If you fail to enter the correct code eight (8) times, the radio goes into INOP mode. You have to wait an hour with the ignition on before the radio returns to LOC mode (go for a long drive somewhere).

After that the the radio will go to LOC mode, then follow this procedure to unlock it—

To unlock the car radio - Have a pen and paper ready. Push and hold stereo preset buttons 2 and 3 simultaneously for several seconds. Three digits will appear in the display "XXX", write them down. Push the AM/FM button, three more digits will appear in display "YYY", write them down.

Press 1 then # (pound). You’ll hear “Invalid Code, try again”

Press 139010 then # (pound). You will be asked to enter your four or six digit code followed by * (start)

Enter the six didgit number obtained from above procedure.

Listen to the four-digit number and write it down. It will be repeated twice

Turn the ignition ON (The radio displays LOC)

Use the MN and HR buttons to enter the $ digit code that you have heard.

Press the AM/FM button. The radio display changes to SEC. Your radio is now “un-locked” and usable. The Theft-Deterrent feature is STILL active! If you want to disable it, use the instruction in Owner’s manual.


Please do accept the solution if the issue is resolved or else revert for further assistance.


Thanks

Rylee

someone (hopefully you) set the 3 or 4 digit security code on the radio. when power is disconnected, like if someone steals your radio, the radio locks and cannot be used. the code can be from 000 to 1999. the hour and minute buttons are used to enter the numbers. 2000 choices - good luck
to unlock the system:
1 turn on ignition - LOC will appear
2 press MN and '000' will appear
3 press MN again until you see the last 2 digits of the code you want to try
4 press HR until you see the first 1 or 2 digit of the code you want to try
5 press AM FM
6 SEC will appear if you got it right - LOC will show if you got it wrong
good luck

Turn the radio off. Push the set button until the : blinks. Push scan to change the hours and the seek to change the minutes. When complete, push the set button again and your done.

u can call any close delar to ur place and they will help u by phone they will give u the code for ur radio and they will tell u they way to enter it in its free from anydelar

If you don't have the radios security code, you can try entering 1111 as some replacement radios were coded with this security code. Your local Audi Dealer may be able to provide the correct security code for your vehicle, if you provide them with your vehicles Identification Number (VIN). This VIN is typically located on the drivers door pillar.

The radio should have a serial number on the unit which also can be given to the Audi dealer and checked in their data base of radio security codes. The serial number will start with AUZ, one radio serial number for example is AUZ1Z9A1965412.

To enter the code on the Wiesbaden Radio: Turn on the radio, SAFE should be displayed.
Push and hold the AM/FM button, then while holding the AM button down, push and hold down the SCAN button. Release the AM/FM and SCAN buttons, and the display should show 1000. Now enter the correct code using the radio pre-set station buttons (1-4). Button 1 changes the first digit in the code "1"000, Button 2 changes the second digit in the code 1"0"00, button 3 changes the third digit, button 4 changes the last digit in the code. In most cases the first digit is a 1 and won't need to be changed. You push each pre-set station button multiple times to step through the digits (1-9) to get the correct code displayed.

Code 1246 would entered by pushing button "2" two times, pushing button 3 four times, and pushing button 4, six times.

After entering the correct security code, push and hold down the AM/FM button, then while holding down the AM/FM button, push and hold down the SCAN button. The display will then show SAFE, release the two buttons, and now the radio should play correctly.

This solution is for a 1999 Grand Am SE am/fm radio with tape cassette player:
Ido not know if this works for other Grand Am products past or prior 1999.
If the lcd display of the radio indicates "LOC" if you do not see anything on the display the small light behind the display is out and you need electronics to go further. If LOC appears here is what to do:
First put the ignition key to the ACC position.
2- press the HR clock adjust button once only ; the display should read 000
3-push the HR button successively until you reach 17 on the radio display 4-then press on the MN (minutes) button again until you reach the number 42
5-when the number 1742 appears on the display, press on the AM/FM button once and after on the POWER/VOL button to power up the radio.