Found this earlier.... not seen this covered here yet.
I have a CD30 MP3 Vauxhall head unit, if I hold down the settings button for about 5 seconds then press BC I get a hidden menu on the MFD with lots of information about the car.
About the only thing I understand is the Coolant temp (which is quite usefull as the astra has no guage).
Not sure what the other info is? anyone want to play and shed some light on it??
Apparently it works on the Vectra C 04+ models too.
Also the menu seems to suggest the that on-board computer is alot more capable than the standard trip computer I have access to. Do you think that the on-board computer can be further enabled by a tech2 upgrade??
Thanks for the reply. I'm not sure what display I have. I have climate control so I get all the graphical display for that as well as the usual RDS, time data, MP3 tag info and stuff. The 'BC' button currently gives me a trip computer.
I played with the test mode earlier, it seems to give readouts for voltage, temp sensors inside and out, coolant temp and a few other things which I don't understand.
It also has a digital tachometer but the speed is in km/h.