Theft-Loc on a 1999 Pontiac Grand Am

Question

I changed the battery out on my car today and now my radio is locked and it needs a code to unlock it. anyone know where i can find this code. I purchased this car used so i know nothing of a code. thanks for any help

Answer 1

You will have to contact a GM dealer. The previous owner put a code in, and unless you can contact them, you will have to have a GM dealer pull a 6 digit code out of the radio, and decode that down to a 4 digit!

Answer 2

Looks like you need to contact a GM dealer. Here's you answer straight from the owners manual:

"Theft-Deterrent Feature (If Equipped)

THEFTLOCK is designed to discourage theft of your

radio. It works by using a secret code to disable all radio

functions whenever battery power is removed.

The THEFTLOCK feature for the radio may be used or

ignored. If ignored, the system plays normally and the

radio is not protected by the feature. If THEFTLOCK is

activated, your radio will not operate if stolen.

When THEFTLOCK is activated, the radio will display

LOC to indicate a locked condition anytime battery

power is removed. If your battery loses power for any

reason, you must unlock the radio with the secret code

before it will operate.

Activating the Theft-Deterrent Feature

The instructions which follow explain how to enter your

secret code to activate the THEFTLOCK system. It is

recommended that you read through all nine steps

before starting the procedure.

NOTE: If you allow more than 15 seconds to elapse

between any steps, the radio automatically reverts to

time and you must start the procedure over at Step 4.

1. Write down any three or four-digit number from

000 to 1999 and keep it in a safe place separate from

the vehicle.

2. Turn the ignition to ACC or ON.

3. Turn the radio off.

4. Press the 1 and 4 buttons together. Hold them down

until --- shows on the display. Next you will use the

secret code number which you have written down.

5. Press MIN and 000 will appear on the display.

6. Press MIN again to make the last two digits agree

with your code.

7. Press HR to make the first one or two digits agree

with your code.

8. Press AM-FM after you have confirmed that the

code matches the secret code you have written down.

The display will show REP to let you know that you

need to repeat Steps 5 through 7 to confirm your

secret code.

9. Press AM-FM and this time the display will show

SEC to let you know that your radio is secure.

Note that with the ignition off, the THEFTLOCK LED

indicator will flash, indicating a secured radio.

Unlocking the Theft-Deterrent Feature After a

Power Loss

Enter your secret code as follows; pause no more than

15 seconds between steps:

1. LOC appears when the ignition is on.

2. Press MIN and 000 will appear on the display.

3. Press MIN again to make the last two digits agree

with your code.

4. Press HR to make the first one or two digits agree

with your code.

5. Press AM-FM after you have confirmed that the

code matches the secret code you have written down.

The display will show SEC, indicating the radio is

now operable and secure.

If you enter the wrong code eight times, INOP will

appear on the display. You will have to wait an hour

with the ignition on before you can try again. When you

try again, you will only have three more chances (eight

tries per chance) to enter the correct code before

INOP appears.

If you lose or forget your code, contact your dealer.

Disabling the Theft-Deterrent Feature

Enter your secret code as follows; pause no more than

15 seconds between steps:

1. Turn the ignition to ACC or ON.

2. Turn the radio off.

3. Press the 1 and 4 buttons together. Hold them down

until SEC shows on the display.

4. Press MIN and 000 will appear on the display.

5. Press MIN again to make the last two digits agree

with your code.

6. Press HR to make the first one or two digits agree

with your code.

7. Press AM-FM after you have confirmed that the

code matches the secret code you have written down.

The display will show ---, indicating that the radio is

no longer secured.

If the code entered is incorrect, SEC will appear on the

display. The radio will remain secured until the correct

code is entered.

When battery power is removed and later applied to a

secured radio, the radio won’t turn on and LOC will

appear on the display.

To unlock a secured radio, see “Unlocking the

Theft-Deterrent Feature After a Power Loss” earlier in

this section."