Blue prints stock radio is locked, and I don't have the four digit pin. what is the easiest way to get too the radio so I can get the serial number? or is there another way?

Hi Lauren, You can check out the link below for more information or take your registration papers with your licence (licence is to prove YOU own the car) to a car dealer ie: Holden, Ford, Chrysler and ask at the sales office for the RADIO SECURITY PIN NUMBER, You'll receive your Radio security pin number and Radio serial number. These numbers belong to your car and once you have them DON'T loose them because in Australia some dealers charge a fee and some don't.... Hope this helped....CHEERS..https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=RADIO+SECURITY+PIN+NUMBER
https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=RADIO+SECURITY+PIN+NUMBER

Owners manual will give instructions on how to enter lock code. The lock code is 4-5 digit number usually printed on a card amongst the owners manual/documents

The process is very simple, just follow these steps and you'll be on your way to listening to your radio again. First of all don't think you need to unscrew anything. The wood panel surrounding your stereo snaps out by pulling on it or using a flat screw driver at the corners. Once you have taken the panel out, you can see that the radio is held in by 2 hooks. Push up and pull forward slightly. You don't have to pull out the entire radio because you can see the serial number on the top surface very easily. Write down the number next to where it reads s/n. Once you have the serial number, call the local dealership and give them your serial number. They will in turn give you a four digit code number that you will enter on your radio. One thing to note is that if you have entered the wrong code number 3 times, your radio would lock up and it would read "OFF". To unlock it, simply park your vehicle in a safe place and leave the radio on for about 1 hour (no engine running just click the ignition switch to operate the radio). After one hour, the radio resets and will ask you again to enter the code. start entering one number at a time using the first 4 buttons. Example, if your code is 4538, you would push button 1 four times to get to the number 4, you would push button 2 five times to get to the number five and so on.. After you have entered the correct code, push the CD button and there you have it.

seek further advice here....CLICK HERE

Procedure:

01. Turn the ignition ON (The radio displays LOC)

02. Hold down the Radio Presets 2 and 3 buttons for six seconds

03. The radio display changes from LOC to a three-digit number. Write this number down. Don’t take forever, fifteen seconds max before the next step.

04. Press the AM/FM button

05. The radio display changes to another three-digit number. Write this number to the right of the first one.

06. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05

07. Call 1 800 537 5140

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

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

10. Enter the number from STEP 6 then * (star)

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. The Theft-Deterrent feature is STILL active! If you want to disable it, use the instruction in your Owner’s manual. Use the code from STEP 11 instead of your personal code.

There should be a 14 character Serial Number beginning with RG or RN or PH or similar (often found stamped in the metal casing )  and maybe a Security Number in the format of TOA123 or TA123 or just A123 at the end of a barcode so please quote EVERYTHING you can find

Your missing two digits from the upper serial#. Turn the radio off, press and hold the 1 & 6 preset buttons, then turn the radio back on. First the Upper serial # come on with a four digit number for 5 seconds then the lower serial number comes on with the other four numbers. (note: the letters U and L are not part of the serial #. it just indicates the upper and lower order of the #'s)You'll need this 8 digit serial number to give to your local honda dealer. There they can run the serial # in the honda system to get your four digit radio security code.

I had the same problem with my 1999 Sonoma. try this:
(You must be in your truck with a cell phone handy)

01. Turn the ignition ON (The radio displays LOC)

02. Hold down the Radio Presets 2 and 3 buttons for six seconds

03. The radio display changes from LOC to a three-digit number. Write this number down. Don’t take forever, fifteen seconds max before the next step.

04. Press the AM/FM button

05. The radio display changes to another three-digit number. Write this number to the right of the first one.

06. You now have a six-digit number, the first three digits are from STEP 03 and the last three digits are form STEP 05

07. Call 1 800 537 5140

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

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

10. Enter the number from STEP 6 then * (star)

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. The Theft-Deterrent feature is STILL active! If you want to disable it, use the instruction in your Owner’s manual. Use the code from STEP 11 instead of your personal code.

Hope it helps.

sometimes the previous owner might wrote it down on the owners manual but if not then you need to pull the radio out and get the serial number and call the dealer they will give you a code