Steering Wheel Controls: General
WARNING: This page is about a different car, the 2007 Saab 9-5. However, it is still accessible from the selected car via links, so may be relevant.
The audio system can also be operated with the steering wheel controls (control buttons on the steering wheel). The steering wheel controls which are used for the audio system comprise 2 units (6 switches). Full instructions for their use are given in the owner's manual.
The steering wheel switches are connected to SID control module which communicates information defining which switches are active. SID sends information about the buttons on the bus which is then read by the head unit.