Service mode with Car radios...?

Hi,

Do new (year 2005) car radios have a service mode for some basic configuration?

I posted a question here some weeks ago about reconfiguring a car radio in a US made car (US FM band standard) to the European FM band (with narrower channel selection).

I have dismantled the radio and checked which components were in the tuner. It is a Philips TEA6848H, (data here:

This circuit is capable of tuning both US and European FM bands and I'm just curious if car radios nowadays have some kind of 'service-mode' which enable simple programming of parameters like regional radio standards and channel spacing etc..

If any of you have heard of something like that, I would appreciate information on how to invoke service mode and which parameters are programmable. The radio in question came in a new Dodge truck. The radio model label plate and tuner images can be founde here:

Thanks for *any' information which might be helpful in having this box correctly tune the narrow European FM channels.

regards

Geir