Garmin 400W Series, Instructions Manual

400W Series 

190-01226-14 Rev. 3 

Instructions for Continued Airworthiness Bell 407 

Page 21 of 26 

Alert Text 

Possible Cause 

Solution 

Not receiving input data on 
232 Channel #(1 through 5) 



 No data has been received on one (or 

more) of the RS-232 channel 
connections for a period exceeding 
ten seconds. 



  Refer to Table 2 “RS-232 device 

is not communicating with the 
400W/420W/430W” 

Not receiving traffic data 



 No traffic data is being received. 



  Check for proper configuration 



  Check the wiring 



  Contact Garmin technical 

support. 

OBS key stuck 



 The OBS key is stuck in the enabled 

(or pressed) state.  Try pressing the 
OBS key again to cycle its operation.



  Contact Garmin technical 

support. 

OBS not available 



 No destination waypoint has been 

selected. 



  Select a waypoint 



 The GPS receiver cannot currently 

determine its position. 



  Refer to Table 2: “The 400W 

Series unit does not compute a 
position.” 

Obstacle database integrity 
error 



 The 400W Series unit has detected a 

problem with a database on the 
Terrain data card. 



  The data is not usable. Try 

reloading the information onto 
the card.  If that does not solve 
the problem replace the card. 

RAIM position warning 



 Although sufficient GPS satellite 

coverage may exist, Receiver 
Autonomous Integrity Monitoring 
(RAIM) has determined the 
information from one or more GPS 
satellites may be in error. 



  Wait for GPS satellite geometry 

to improve. 

Searching the sky 



 The 400W Series unit is searching 

the sky for GPS satellites. 



  Wait 20 minutes for unit to 

complete cycle or until the 
current position is located. 

Stored data was lost 



 All user waypoints, flight plans and 

system settings have been lost due 
to a memory battery failure or system 
reset. 



  If system was not reset contact 

Garmin technical support. 

TAWS has failed 



 The 400W Series unit has detected a 

failure in its TAWS system. 



  Ensure that terrain database is 

inserted in right most card slot. 



  Reload the terrain database. 



  Contact Garmin technical 

support. 

TAWS inhibit key stuck 



 The external TAWS inhibit key is 

stuck. 



  Verify that the wiring is not 

shorted to ground. 



  Contact Garmin technical 

support. 

TAWS mute caution key is 
stuck 



 The external HTAWS aural 

suppression input is stuck 



  Try pressing the TAWS mute 

key again to cycle its operation.  
If problem persists contact 
Garmin technical support. 

TAWS reduced protection 
key is stuck 



 The external TAWS reduced 

protection key is stuck 



  Try pressing the TAWS reduced 

protection key to cycle its 
operation.  If the problem 
persists contact Garmin 
technical support. 

TERRAIN configuration 
conflict 



 The current Terrain configuration is 

not supported by the hardware. 



  Reconfigure the unit.