Gcu 477 Troubleshooting - Garmin G1000 System Maintenance Manual

5.19

GCU 477 Troubleshooting

5.19.1
GCU 477 Alerts and Problems
Failure Message
GCU CNFG – GCU Config error.
Config service req'd.
GCU FAIL – GCU is inoperative.
MANIFEST – GCU software
mismatch. Communication halted.
G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air
190-00716-01
Cause
The G1000 has detected a
GCU 477 configuration
mismatch.
The G1000 has detected a
failure in the GCU 477.
The system has detected an
incorrect software version
loaded in GCU 477.
Solutions
•
Load GCU configuration files.
•
Replace GCU.
•
If problem persists, replace
master configuration module,
check config module wiring for
faults and replace if necessary.
NOTE
New Terrain/Obstacle cards,
Jeppesen Aviation Database and
other optional features (i.e.
TAWS unlock card) will need to
be replaced if the master
configuration module is changed.
The G1000 System ID number
will change to a new number
when installing a new master
config module. The old Terrain
and other cards will no longer
work as they will remain locked
to the old System ID number.
•
Check wiring for faults (ref Failed
Path troubleshooting section).
•
Replace the GCU 477.
•
Load the correct software version.
See Section 3.9 for the Software
Load Procedure.
Page 5-77
Revision 1