190-02207-A2
GPS 175/GNX 375/GNC 355 Part 23 AML STC Maintenance Manual
Rev. 3
Page 5-8
Figure 5-2 GPS 175/GNX 375/GNC 355 System Alert Troubleshooting
Sheet 2 of 2
GPS 175/GNX 375/
GNC 355 cooling fan
failed.
System Alerts
GPS 175/GNX 375/
GNC 355 under temp.
Remote Go Around
key is stuck.
Cause
Cause
The cooling fan is not
turning at the desired
RPM.
Bring the GPS 175/
GNX 375/GNC 355
within operating
temperature as
described in the
Temperature
diagnostics page. See
Section 3.4.4.13.
If faults still exist,
contact Garmin.
Corrective
Action
The remote go around
key is stuck in the
enabled or pressed
state.
Corrective
Action
Go to the
Diagnostics > Discrete
Inputs
page in
Configuration Mode
(See Section 3.4.4.3).
Press the key to cycle
its operation.
If the state remains Active,
inspect the wiring of
J1751–36 on GPS 175,
J3752–15 on GNX 375, or
J3551-36 on GNC 355 to
ensure that it is not loose
or shorting to ground.
Corrective
Action
Check the fan intake
and outlet slots on the
bezel for dust or
obstructions and clean
as needed.
LRU software
mismatch
Cause
Crossfill function is on,
but not working due to
a software mismatch.
Corrective
Action
Contact dealer for
software update
Crossfill is inoperative
Cause
The unit lost
communication with
the other cross-side
navigator.
Corrective
Action
Contact dealer for
service.
One navigator requires
service.
