I am having trouble with the radio shutting off after about 1 minute. I have to turn the power button back on to listen to another minute. I cant find the owners manual.What can I do about this?

Step 1: Look at your radio. Check and see if the code "RDS" is written on the face of the radio. If "RDS" is present, contact a GM dealership to have your radio unlocked by them.
Step 2: Check for the identification code. Press buttons 2 and 3 for 8-10 seconds. If a code does not appear on the display, you won't be able to unlock your radio in this manner.
[If that doesn't work vvv]
In order to obtain your radio unlock code, you need to find your radio's serial number. You can get the radio serial number directly from your radio.
Step 1: Turn on the ignition. Turn the key to "accessory" mode or "on" mode.
Step 2: Turn on the radio. Press the power button to turn on the radio.
If your radio displays any functions such as playing a CD, cassette, or a radio station, your radio is not locked. If no sound is heard, you may need to replace your radio unit.
If your radio is locked, "LOC" is displayed on the screen.
If "INOP" is displayed, keep your ignition on for 60 minutes with "INOP" on the display. After the hour is up, it should change to "LOC." After this you can proceed with the next step.
Step 3: Write down the code. Press buttons 2 and 3 at the same time and hold for 8-10 seconds. Write down the three-digit code that is displayed.
Step 4: Note down the code. Immediately press the AM/FM button. Another three-digit code is displayed. Write it down as well.
This is your six-digit radio serial number.

Now that you have your radio's serial number, you can obtain the radio unlock code from General Motors. Be ready with a pen and paper to write down your radio unlock code.
Step 1: Contact the GM radio hotline. From any landline or cell phone, call the toll-free GM Radio hotline at 1(800) 537-5140.
Step 2: Enter the code. When it requests a code, enter "106010" on the keypad, followed by the pound (#) sign.
Step 3: Enter the radio serial number. You will be prompted to enter the radio serial number you have just obtained.
At the prompt, enter the number followed by the pound sign.
Step 4: Write down the radio unlock code. The prompt will read out your four-digit radio unlock code. Write it down precisely.

Now that you've obtained your Chevrolet radio unlock code, you need to enter it into your radio.
Step 1: Switch on the radio. Turn your ignition on and press the radio power button. Your radio will display "LOC."
Step 2: Enter the first two digits of the radio unlock code. Press the hour button on the radio to enter the first two numbers of your radio unlock code.
Continue pressing the button repeatedly until the first two digits of the radio unlock code are displayed.
Step 3: Enter the last two digits of the unlock code. Press the minute button until the last two numbers of the radio unlock code are displayed.
Repeatedly press until they match the two digits you need.
Step 4: Confirm the code. When the code matches, press the AM/FM button. "SEC" will display on the radio, indicating a successful attempt to enter your radio code.
If you enter the code incorrectly eight times, the display will switch from "LOC" to "INOP." You'll need to leave the ignition on for an hour as described in Part 2 before you can retry.
Write the radio unlock code in a safe place such as in your owner's manual for future use.
Most car dealers will charge you a lot of money just to get the code for you. If you follow the right steps, you can get the code for free and be able to start listening to the radio again in just a few minutes!
How to Unlock Chevrolet Theftlock Radio

• Try holding power button for 15 seconds.

• Or Try unplugging, plugging in radio (takes 5 minutes):
Putty knife to remove bezel around radio, remove 4 star screws at 4 corners of radio, unplug big plug (with all the wires) in the back and plug it back in. Look up videos for removing radio if you're unsure first.

Depends on the radio.
General idea is this:
turn radio power off on face of radio. Clock should show.
push button such as SET / CLOCK / TIME
push other button HOUR MIN up down seek scan ff rew (one button will control hour other button will control minute)
turn radio power back on. clock should remain set.

Newer cars come with a switches that delays their shut down of certain lights on the car. Sometime they allow you to get inside your home before the turn off but sometimes the switches malfunction and you light never turns off. I have had this happen on my 2006 vehicle several times in the past. Maybe these kind of switches one day will get a little better. Until then, you can ignore it or pay the big bucks and have a technitian repair it..

Clean battery terminal's

Some cars have new system in the computer that lets the radio function for 20 minutes after the key is turned off and no doors have been opened, system should shut down immediately after you open a door

Turn on radio - the word SAFE will appear in the display. Press th P.SCAN and RBDS buttons simultaneously and hold them down until "1000" lights up in the display.Release buttons.Do not, under no circumtances, continue holding them down or press them once again. This will cause the radio to consider the number 1000 to be the input code.Use station buttons 1,2,3,and 4 to enter the code number on your Radio Card. Use the button 1 to enter the first number 2 for the second number 3 for the third number and 4 for the last number.Once you have entered the code and it shows on the display,press the P.SCAN and RBDS buttons down again simultaneously and hold them down until the word SAFE appears in the display.Release buttons. Soon afterwards a frequency will be displayed.

I have a manual for a '99 model - the one with separate radio/cassette and CD model No's;
OK55Y 66 860
OK55L 66 860
OK55D 66 860
3K55L 66 860
2K55D 66 860
3K55Y 66 860

Under "How to enter your password"
1. press power button & "Test" appears for 5 seconds, and blinks for 5 minutes. If you turn the power button off then back on again within 5 minutes "Code" blinks on the display.
2. enter password using the numbered buttons - press button 1 once to let it know it's the first digit, then press button 1 again however many times to bring up the code for the first digit. Press button 2 to let it know it's the second digit, then again however many times....etc. To enter default 1111 code, press button 1 twice,, 2 twice, 3 twice then 4 twice.
3. when all four digits entered (default is 1111) press SEL button and display should say "GOOD"
4.You get three goes, if still wrong after third attempt "HOLD" then you have to leave it for an hour

Nothing wrong with it. When you remove the key, it stays on for about 20 minutes. It gives you time to finish listening to your radio and roll up the window. Once the driver door is open, everything shuts off or if 20 minutes has passed. 
 
 

There is a small 1/4'' oblong cover plate on the underside of the stearing column. Pop this out and there is a button you push in ( like the Crysler key relase) and this will allow you to remove the key.