System indicator LEDs are generally illuminated on the system by ILOM based on the Sun server platform policy. Typically the system indicator LEDs are illuminated by ILOM when any of the following conditions occur:
Fault or error is detected on a component.
Field-replaceable unit (FRU) requires service.
Hot-plug module is ready for removal.
Activity is occurring on FRU or system.
You can view the states of system indictors from the ILOM web interface or the ILOM CLI. Additionally, in some instances, you might be able to modify the state of a system indicator.