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GNS 400W Series Maintenance Manual
Page 4-5
190-00356-05
Rev. A
Table 4-1. Fault Messages and Recommended Actions (continued)
No differential GPS position
N/A
Replace the GPS module
OBS key stuck
The OBS key is stuck in the
enabled (or pressed) state.
Try pressing the OBS key
again to cycle operation.
Return the unit for service.
Obstacle database integrity
error
The unit has detected a
problem with a database on
the TAWS/Terrain data card.
The data is not usable.
Return card to Garmin for
service.
Poor GPS coverage
N/A
Check the antenna and
cabling.
Replace the GPS module.
Stored data was lost
All user waypoints, flight
plans and system settings
have been lost due to a
memory battery failure or
system reset.
Replace the memory battery.
Return the unit for service.
Terrain configuration conflict
The current TAWS/Terrain
configuration is not supported
by the hardware. The TAWS
hardware may have failed, or
the unit may be
misconfigured. The unit’s
terrain capabilities will be
downgraded to “Terrain”
instead of “TAWS”.
Check the applicable flex
cable.
Return the unit for service.
Terrain database integrity
error
The unit has detected a
problem with a database on
the TAWS/Terrain data card.
The data is not usable.
Return to Garmin for service.
Terrain has failed
The unit has detected a
failure in the terrain system.
The most likely cause is a
missing or corrupt terrain
database. Terrain
functionality is not available If
the terrain database is not the
cause, return the unit to
Garmin for service.
Verify that a terrain data card
is fully inserted into right data
card slot.
Replace the terrain data card.
