Contact your dealer. You will need VIN number and possibly serial number off radio unit
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.
SOURCE: I NEED TO UNLOCK MY STERO IN A 2004 TAHOE
There is no actual "security code" in the radio as in past model years. The newer theft deterrent system utilizes the class 2 serial data to determine if the radio is in the appropriate vehicle...in other words it compares the VIN it has stored in it's memory with the VIN of the other modules (body control and PCM) in the vehicle to "check" to see that it's in the correct vehicle.
Each time the radio receives the "run" power mode message, it compares the VIN information it has stored to the VIN information received from a module on the class 2 serial data circuit responsible for transmitting that information. If a mis-match occurs, the radio display will indicate to the user the radio is locked. Once this takes place the radio will not respond to any buttons/commands and becomes inoperative. But the dealer can reestablish the radio into a different vehicle with a scanner.
There are 2 types of GM Theftlock, Theftlock I and Theftlock II. The Theftlock I is found in pre 2000 vehicles, and Theftlock II is in the later models.
Theftlock I - Uses a volatile user settable code that is input through the key pad on the front of the Radio. If the power is lost (dead battery etc.) the code is gone and must be re-entered for the radio to work. But with the correct procedure the owner can unlock it.
Theftlock II - Uses an EPROM (erasable/programmable read only memory) or a PROM (the difference is you can not alter the prom once it is programmed).
In either case the code is burned in and holds even when the power is lost. With Theftlock II the radio is married to the vehicle by way of the VIN. When the vehicle is started the computer compares the number in the radio with the VIN in the body control module. If they match, the radio works, if not the radio displays LOC and you are finished, there is no easy way around it. The radio will not work until you make a trip to the dealer.
The dealer will use a TECH 2 scanner to change the VIN stored in the radio. The radio does not need to be removed (for the serial number or any other nonsense). The technician just plugs into the computer and resets the VIN in the radio.
Thank you for using fixya and good luck. you might get luck by removing the fuse toy our radio for 5 min and reinstalling it, this will reset the radio to default and all you need to do is reset the clock and radio presets.
SOURCE: how to reset service light on a holden astra 2004
theres a push button to the right of the clocks.... press and hold the button. switch ign on. the letters insp appear for 2 seconds. keep holding button in until blank appears in the display. then release button and switch off ign..... job done. its the one for astra in uk but cant see it being different. please leave a comment and thumbs up
SOURCE: my high beam lights & parking lights work, but not the normal lights.1985 holden astra!
By "normal lights" I assume you mean "low-beam headlamps"? If this is true, then you may either have burned out headlamp bulbs or a faulty low-beam headlamp relay or relay circuit.
Testimonial: "Thank you for your assistance. Burnt out low beam headlamp bulbs was the problem. They said it was unusual for both to go at the same time, but that's how it was. Your help was greatly appreciated. "
SOURCE: I need a radio code for my holden astra
Does anyone have any tips for obtaining the radio security code in an Astra without having to fork out the $25 - $33 being quoted by all the Holden dealers i've contacted?,
Thanks
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