Diagnostic help
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.
Ignition +54 can be read in DICE using the diagnostic tool.
If +54 is absent when +15 is present, the bus message Ignition +54 ON is generated after 20 s.
The ACC uses the bus message Ignition +54 to disengage the ventilation fan while the engine is being started.