v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, “Parts listing, Type 7979 and 1914 server,” on page 79 to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Error code Description Action
166-407-001 System Management: Failed.
BMC indicates failure in I
2
C bus test.
1. Disconnect all power cords and external cables
from the server, wait 30 seconds, reconnect the
power cords and cables, and retry the test.
2. Update the BMC firmware to the latest level.
3. Reseat the operator information panel cable.
4. Replace the following components one at a time,
in the order shown, restarting the server each
time:
a. Operator information panel assembly
b. (Trained service technician only) System
board
166-nnn-001 System Management: Failed.
Note: nnn indicates the failure type.
v 300 to 320: Self-test failure
v 400 to 420 (excluding 412, 414, and 415):
I
2
C bus test failure
1. Disconnect all power cords and external cables
from the server, wait 30 seconds, reconnect the
power cords and cables, and retry the test.
2. Update the BMC firmware to the latest level.
3. (Trained service technician only) Replace the
system board.
166-412-001 System Management: Failed.
I
2
C bus failure.
1. Disconnect all power cords and external cables
from the server, wait 30 seconds, reconnect the
power cords and cables, and retry the test.
2. Update the BMC firmware to the latest level.
3. Reseat the power backplane.
4. Replace the following components one at a time,
in the order shown, restarting the server each
time:
a. Power backplane
b. (Trained service technician only) System
board
166-414-001 System Management: Failed.
I
2
C bus failure.
1. Disconnect all power cords and external cables
from the server, wait 30 seconds, reconnect the
power cords and cables, and retry the test.
2. Update the BMC firmware to the latest level.
3. Reseat the hard disk drive signal cable.
4. Replace the following components one at a time,
in the order shown, restarting the server each
time:
a. Hard disk drive backplane
b. (Trained service technician only) System
board
62 IBM System x3650 Type 7979 and 1914: Problem Determination and Service Guide
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