Dell PowerEdge C6145 - Manual (Page 24)

24 | About Your System
BMC Heart Beat LED
The system board provides BMC heart beat LED (CR2) for BMC debugs.
The BMC heart beat LED is green. When the system AC power is on, this
LED will light. When BMC firmware is ready, the BMC heart beat LED
will blink.
Figure 1-14. BMC Heart Beat LED
1 BMC heart beat LED 2 system board