"The scan tool sends to the vehicle's bus (CAN, VPW, PWM, ISO, KWP. After 2008, CAN only) " this is a comment form wikipedia, i have a 2001 coupe turbo and wondered what "bus" i have???
I thought the astra was CAN-BUS myself
Found this not sure if its a massive help though really.
Yeh Mk5 astras are can bus. Thats why mk5 owners have difficulties in fitting additional electrical products ... e.g. HID's, interior leds etc.. Mk4 arent can bus.
just set it too auto
ARDEN BLUE GSI