Head Unit Inputs, Bus

WARNING: This page is about a different car, the 2006 Saab 9-5. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Head Unit Inputs (bus) - Communication Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Ignition +B (on/off) from DICE (628)
CD changer information from CD changer (355)
Vehicle speed (km/h, mph) from MIU (540)
Rheostat value (0-100%) from SID (541)
Rheostat Night Panel (0-100%) from SID (541)
Night Panel (on/off) from SID (541)
Display illumination (0-100%) from SID (541)
Steering wheel switches from SID (541)
Key Correct (on/off) from TWICE (632)
Wheel speed RL (km/h) from ESP (671)
Diagnostics communication, see BUS AND DIAGNOSTICS COMMUNICATION .