Garmin G1000 Maintenance Manual page 103

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5.1.6.16 GCU 475 Advisory Messages
Advisory Message
GCU CNFG – GCU Config error.
Config service req'd.
GCU FAIL – GCU is inoperative.
MANIFEST – GCU software
mismatch. Communication
halted.
G1000 System Maintenance Manual
190-00903-00
Possible Cause
The G1000 has detected a
GCU 475 configuration
mismatch.
The G1000 has detected a
failure in the GCU 475.
The system has detected an
incorrect software version
loaded in the GCU 475.
Recommended Actions
a. Load GCU configuration files,
b. Replace GCU.
c. 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.
Replace the GCU 475.
Load correct software version.
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