My stereo in my blazer is locked need a code to unlock it

No, the stereo unlock code cannot be retrieved with the VIN.

You can get the unlock code for free from any Honda Dealer. You will need to give them the stereo serial number from the back of the stereo or written on a card (or possibly the manual) provided when the vehicle was new. If the dealer removes the stereo to retrieve the serial number they will charge around $100.

DANGER: Do not try to enter the code randomly! The stereo will lock out after 10 incorrect attempts.

Nobody can give you one. That's a unique number for your stereo. The stereo has become locked, much like a phone will lock and require a code to unlock it. Nobody here will know that code.
The only hope you have is if the code is either four zeros (0000) or (1234) Good luck. Multiple wrong entries may lock the stereo permanently.

yeah they should be able to unlock the stero /unhooking battery without retreiving codes will lock up stereo . i would tell them get codes or get new stereo

You will need to take it to the dealership to have them pull the lock code and call Delphi for the unlock code then they can unlock it for you and have them write down the unlock code for you then you can follow the procedure in the owners manual to make your own unlock code or keep the orginal.

this happened to me. there is a code you have to enter. I bought my blazer used and didn't know the code so i took it to a dealer. they will retrieve the code, unlock it and then YOU write it down in your manual for future use!

If the stereo is original the unlock code for the stereo is the last numbers of the chassis number

check in your owners manual for radio lock and unlock code or local dealer,assuming thats your question

Unfortunately, you have to pay for this information. Either from a dealer or a website. I'm giving you a site I had to use for the same problem. Follow the instructions on the front page for your 4-6 digit code you send them.
http://loc-code.com/

I dont know if holden barina uses the same stereo as a US GM vehicle, but if it is a delco stereo (same as US models) then any gm dealer can retrieve the scrambled code and call their automated system to get the unscrambled unlock code. Just make sure if they do this for you to have them disable the theftlock system. With theftlock disabled a dead battery will not cause you any further problem. Hope this helps.

yes,
turn the switch on all the way without starting the car.
leave it like that for a couple of hours and the it will unlock itself.
that's the " only " way. unless you drive somewhere for a couple of hours