190-01717-B1
G500/G600 TXi Part 23 AML STC Maintenance Manual
Rev. 1
Page 4-24
Figure 4-15 GDU Config and Battery Alert Message Troubleshooting
Battery/Configuration
Alert Messages
If fault still exists,
contact Garmin.
Return GBB 54 to
Garmin for Service
Battery
unavailable:
fault
detected
Battery
unavailable:
communication
lost
Corrective
Action
Corrective
Action
Service
Required
Multiple master
config modules
detected.
More than one
GDU is configured
as “Master”
Ensure only one
GDU is configured
as “Master” under
the “GDU Type”
configuration
window
Cause
Corrective
Action
External config
module has been
overwritten
System configuration
module has failed or
is missing
This message is
expected if a
configuration
module has been
replaced
External config
module cannot be
written to, read
from, or is not
detected in the
system
External config
module has been
overwritten by internal
config module
Service
Soon
Cause
Cause
Corrective
Action
Corrective
Action
Internal Config module
has been overwritten
This message is
expected if a GDU
has been replaced
Internal Config module
has been overwritten
by harness config
module
Cause
Corrective
Action
Battery
unavailable:
power output
failed
Corrective
Action
The battery capacity
test has not been
successfully completed
or
Capacity test not run in
last 392 days
Verify that the
GBB 54 battery
cell is fully charged
Battery
unavailable:
capacity test
required
Cause
Corrective
Action
Run the battery
capacity test in
accordance with
Section 5.13.8
Verify GDU
configuration
matches printed
configuration log
Inspect config
module wiring and
connector for bent,
damaged, missing
pins/wires
Replace external
configuration module
in accordance with
Section 5.1.4 or
Section 5.1.5
Verify GDU
configuration
Verify GBB 54 and
GDU wiring and
connections
Verify that GBB 54
battery cell is
charged
Verify GBB 54 and
GDU wiring and
connections
If configuration
does not match
printed log, load
GDU configuration
from saved SD
card
Verify GDU
configuration
matches printed
configuration log
If configuration
does not match
printed log, load
GDU configuration
from saved SD
card
Maintenance
Log Message
Maintenance
Log Message
Maintenance
Log Message
Maintenance
Log Message