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From The Saab Tech Wiki
The head unit found in most models is manufactured by Clarion and is slightly less than double DIN height.
===Security===
Two methods of security exist for the headunit. The method used is based on the year of the car. Older models use a 4 digit passcode, which has to be re-entered when power is lost from the car. In new models the head unit is married to a the DICE system in the car and will not function in another car unless it is first divorced from the old car and then remarried to the new car. Additionally, because the head unit requires the SID in order to function, it cannot be used in anything but the 900 and 9-3.
===Media===
There are primarily two types of head units available, one offering AM/FM and a cassette player, and another offering AM/FM and a single CD player. The European model offers RDS information such as radio station information while the US unit substitutes a weather band option.
