Head Unit Inputs, Bus (Petrol)
^ 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 TC/ABS (382)
^ Diagnostics communication, see Bus and diagnostics communication.