I got the following information from a previous thread, I can't remember who
posted it, but it helped me..
"If the display does not work after fitting a later stereo (ie CAR400 or
CDR500) it can easily be reprogrammed by a Vauxhall dealer. The cost can
vary but it is rarely more than £10 to £15. They can do it while you wait
but an appointment may be necessary.
Alternatively, the following normally works. It basically involves changing
the stereo setting so it outputs as an 8-digit display rather than a
10-digit.
All the radios have hidden display menus.
On a CDR500 hold the 3 and 5 button in and switch on (with the ignition on)
the radio will display DISPLAY 8 or DISPLAY 10. Hold the buttons in until
the radio beeps and the display will change from 8 to 10 or vice versa.
Release the buttons and switch the radio off and then back on and the
programme will have been changed.
On a CAR400 the buttons are 4 and 5.
This may have changed on later stereos so experiment with other combinations
of buttons if it does not work!
In addition on all radios to switch off/on the ignition on/off logic do the
same as above with the 1 and 3 buttons"
Steve
