I need the unlock codes for a anti theft delco radio 1991 olds 98

urn your ignition off to begin retrieving your radio code. Press and hold the "1" and "6" preset buttons on your radio. Turn your ignition on. Write down the code displayed on your radio. The display will flash with two numbers: one beginning with a "U" and one beginning with a "L." Write down both numbers (beginning with the "U" number), and then disregard the "U" and the "L." This number (eight digits) is your radio serial code. You'll need it to retrieve your radio anti-theft code. Contact Honda to retrieve your radio anti-theft code. You'll need your 17-digit VIN...Vehicle Identification Number, found beneath the driver's side of the windshield and your radio serial code. Honda's customer service number is (800) 999-1009. Provide the representative with the information to acquire your radio anti-theft code. You can also retrieve your radio anti-theft code online at https://radio-navicode.Honda.com/ then turn your ignition to "Acc" or "On" to power on your radio. Enter your radio anti-theft code using the preset buttons at the bottom of your radio. For example, if your anti-theft code is "55512," you would press the "5" button three times, then the "1" button, then the "2" button. This will unlock and reset your Honda radio.

you can try the above for your 2000..if you get two 4 numbers have someone write them down. then go to the web site above. you'll need the VIN too.
Unfortunately most of the time, owners of 2000 and older Honda vehicles need to physically remove the radio from the dashboard by using some automotive pry bar tools and locate the serial number sticker on the back of the unit.).

hope this helps a little

Are you talking about the radio code?

When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio.
The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your vehicle manufacturer's service centre and get them to enter this code for you.

1. • 1 Look in your owner's manual booklet for your radio anti-theft code. The code is printed on a small card (similar to a credit card) and included with your owner's manual. If you can find the code, skip to Step 5.
     If you cannot find the code, you'll need to retrieve it.
     
   • 2 Turn your ignition off to begin retrieving your radio code. Press and hold the "1" and "6" preset buttons on your radio. Turn your ignition on.
     
   • 3 Write down the code displayed on your radio. The display will flash with two numbers: one beginning with a "U" and one beginning with a "L." Write down both numbers (beginning with the "U" number), and then disregard the "U" and the "L."
     This number (eight digits) is your radio serial code. You'll need it to retrieve your radio anti-theft code.
     
   • 4 Contact Honda to retrieve your radio anti-theft code. You'll need your 17-digit Vehicle Identification Number, found beneath the driver's side of the windshield and your radio serial code. Honda's customer service number is (800) 999-1009. Provide the representative with the information to acquire your radio anti-theft code.
     You can also retrieve your radio anti-theft code online for free at https://radio-navicode.honda.com/
     
   • 5 Turn your ignition to "Acc" or "On" to power on your radio. Enter your radio anti-theft code using the preset buttons at the bottom of your radio. For example, if your anti-theft code is "55512," you would press the "5" button three times, then the "1" button, then the "2" button. This will unlock and reset your Honda radio.
     

The unlock code for the radio in each vehicle differs from each van. You will have to go to a dealer to get your specific code by means of using you v.i.n. I think that is the answer that you are looking for.
If it isn't and you just need an explanation what an unlock code is, when you loose power and reconnect power, the anti-theft is engaged. There for you loose your functions on the radio. To reprogram it you will need your unlock code to do so.
Hope this helps.

you need to contact dealer and provide your VIN# to get radio code. It's theft deterrent radio and dealer is only source for codes.

shouldnt have to pay notify a chevy dealer in person for code most dealers wont deal with a code problem over phone they dont charge for the code due to the fact that a dead battery can also lock out the radio system into the anti-theft mode

you will need to pull radio out and retrieve s/n off of stereo. with s/n i can get anti theft code for you. if you need help with removing radio let me know.

need radio code for 98 booneville supercharge delco radio

Contact the dealer but ask for "parts department" and they will give you a step by step on how to unlock it and get the scramble code.