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The first method is to contact Holden with you car details, this will cost you money. If you have the original owners manual it is often listed in there. If you don't, you will need the serial number for the system fitted. This usually involves taking the stereo out of the dashboard as the serial number is printed on the side of it.
Try some of the Holden Astra owners forums as they might give you the code. Some unlock codes are specific to the stereo and not the car.
If you have the serial number there are some websites where you can get the code for free.
the new stereos are unlocked by an unlock cd.following are the options to obtain an unlock code for the stereo: 1-contact ur car dealer and ask him for the unlock cd. 2-go to some good car stereo shop and ask them to unlock the stereo. 3-if u r a wiz kid, wrie the model of ur stereo in google and search it for an unlock cd and burn it and insert it in the stereo.
Unfortunately the only CLARION code available for free (using a serial number ) from anywhere on the Internet is if your radio also has a BARCODE SERIAL NUMBER beginning with C7000000 + + + + on a label somewhere on the metal casing. (There are usually two barcodes on one label. The one required is the lower one )
If not then it will only be available from your Main Dealer or a Decoding Service or your local Car Radio / Audio Store who will connect a laptop to read/recode the memory chip (EEPROM)
The pin number is usually in the vehicle manual. Visit the wreckers to see if the standard manual was in the car and just check that. other than that you might need to contact holden with the vin number of the car etc to get the unlock code. that is the vin number of the car it came out of. If you cant get that i am sure that they wont unlock it for you as it will be presumed stolen. If you cant get the code from holden, take the stereo back as its going to be an expensive paperweight