Control module power supply: Diagnostics
WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
When +30 voltage is absent, it is only possible to operate the front side windows up and down and the rear side windows up. None of the other functions controlled by the STC control module can be operated.
When +54 voltage is absent, none of the functions controlled by the STC control module can be operated.