Douchermann

Hey guys. I purchased an 89 GTA a while ago and I just dropped in a motor for it ('90 formula motor). The delco radio came with the car, but it was in the trunk. When I turned the car on, it gave the old 'Loc'. Is there anything internally I can do with the radio to unlock it? I am electronically inclined, so throw what you have at me. I have an aftermarket head-unit, so I'm not going to spend money to have GM reset the radio. I just want to play around with it for a while. Even permanently disabling the lock function is an option, I just need to know how. Thanks

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Don't worry, I wouldn't take me seriously if I had a name like mine either. (aka douchermann)

1990 Formula - GONE!
1989 GTA - 350/700R4 from formula, straight exhaust with side exit by passenger tire. Engine is TPI with speed density setup.

glock

the only way i know how to unlock it is by pressing the mute button on the steering wheel controls

Black91B4C

A nice GM dealer will look up the code for free...just call around.

87 formy

Taken from whitebird00 over at ls1tech referring to 98-02 monsoon stereos, don't know if it'll help you or not...

"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 (or when the radio is removed).

You usually don't have to worry about the TheftLock feature. TheftLock is not activated when you buy a new car and most owners don't bother activating it after taking delivery. Considering how little used Monsoon head units cost, there isn't much market for stolen ones. You can tell if TheftLock is activated by the flashing red LED on the face of the radio when the car isn't running.

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.

Unlocking the Theft-Deterrent Feature After a Power Loss

If you know the code that was used to lock the radio then use the following instructions from the owner's manual to unlock the radio.
Quote:
Enter your secret code as follows; pause no more than 15 seconds between steps:
1. Turn the ignition on. LOC will appear on the display.
2. Press MIN and 000 will appear on the display.
3. Press MIN again until the last two digits agree with your code.
4. Press HR until the first one or two digits agree with your code.
5. Press AM-FM after you have confirmed that the code matches your secret code. 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 don't know the code that was used to lock the radio then you will have to use the dealer's unlock procedure as follows. The dealer code changes over time - the one listed is current as of this posting. If it doesn't work try 08359 or search the forum for messages with a more recent code.
Quote:
1. Press and hold presets 2 & 3 for about 10 seconds until the first three digits of the display code are displayed.
2. Write the numbers down.
3. Press the AM-FM button, write down the next three numbers.
4. Call 1-800-537-5140. When asked, enter dealer code 202108, press the * button, and enter the six digit code from the radio. You will get an unlock code, write it down.
5. Go back to the car, press the HR button and set the first two numbers, press the MIN button and set the next two numbers, then press the AM-FM button. The display will show SEC, indicating the radio is now operable and secure.

To remove the code, repeat step 5. you should see --- on the radio face indicating the code is now out of the radio."

5.7-89GTA

I changed my spark plugs (another gruesome story) and disconnected my battery following advice from someone who shorted out their starter when they dropped a tool on it. With my luck that would happen to me, so I disconnected the battery. Now, my radio is locked. Checked the owners manual (I know, shoulda done that before!) and it describes an unlocking sequence using a preset 6 digit number that the owner can program into the radio. I have no idea if the previous owner did that, but my radio will not respond to the first step of the process which is hitting the "set" button to start inputing numbers. Thought I would try all zeroes first, but cannot get the unlocking feature to start. Manual says to contact your dealer if you lose or forget your secret number. Has anyone dealt with this problem? Your help appreciated.

This was the only info I could find in a search. Wondering if there was any new info since 2007. My problem is that I can't even get the unlocking sequence to even begin.

itsMikey

when i had my stock delco deck all i did was press the mute button on the steering wheel and it unlocked....

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350 TPI-Dyno Dons Headers-MSD Dist. Cap and wires-Magnaflow Exhaust-2 12" Rockford Fosgate P1- Q-Forms Box-500watt American Sound Bass Amp-500watt Performance Techniqe 4Ch Amp-Eclipse Head Unit- 4x6 Performance Techniqe 2 Way Dash Speakers-6x9" Concept 3 Way Sail Panel Speakers

5.7-89GTA

The MUTE button worked today, radio back. I did try that at first and did not work. Thanks.