To change a headlight on an 08 plate astra, you need to go in through the wheel arch with the streering lock full on.
Hi turn the wheels on full lock there is a flap in the wheel arch you access the head light bulbs there.
Try this site. It includes a lot of detail about the Astra talgate/boot lock assembly including the circuit diagram you need. http://sites.google.com/site/gmlockrepairkit/home/astra-h-zafira-b
There is no way to lock the crank on this engine. If you are replacing the timing belt, a special tool is available to lock the cams in position
if the doors do not lock then one of the fuses is out!
For trunk lock you can get it for around $30 form any auto salvage and get it replaced by your poor lock for around $50. So altogether its going to cost around $80 to $90.
brown/red to lock the doors brown/white to unlock the doors
the immobiliser is mounted to the steering lock, u need to remove the steering wheel and column to get to it
turn the key to the on position. then you should be able to turn the wheel
how can change pass lock account in Crossfire
take $15 Off change lock
20 $ Off Change Lock