NAVIGATION SYSTEM (for HDD) > GPS Mark is not Displayed

for Preparation Click here


INSPECTION PROCEDURE

1.CHECK CABIN

  1. Check the cabin for any object that might interrupt radio reception on the instrument panel. If such an object exists, remove it and check if the GPS mark reappears.

    HINT:
    The GPS uses extremely faint radio waves originating from satellites. If the signal is interrupted by obstructions or other radio waves, the GPS may not be able to properly receive the signal.

    OK:
    The GPS mark appears.



NG
Go to step 2
OK

NORMAL OPERATION 

2.CHECK SURROUNDINGS


  1. Check if the vehicle is in a location where GPS signal reception is poor. If the vehicle is in such a place, relocate the vehicle and check if the GPS mark reappears.

    HINT:
    The GPS uses 24 satellites in 6 orbits. At any point in time, 4 satellites should be able to pinpoint your vehicle. However, GPS signals may not reach the vehicle due to influence from the surroundings, vehicle direction and time. For examples, see the following illustration.


    I100196E28

    OK:
    The GPS mark is displayed.


Text in Illustration 
*a
Example
*b
In a tunnel
*c
In a building
*d
Under an overpass
*e
On a forest or tree-lined path
*f
Between tall buildings
*g
Under a cliff or overhang
-
-


NG
Go to step 3
OK

SYSTEM RETURNS TO NORMAL 

3.CHECK GPS INFORMATION (OPERATION CHECK)
E187380

  1. Enter the "GPS Information" screen. Refer to Check GPS & Vehicle Sensors in Operation Check (GPS Information) (Click here).

  1. Check how many of the following codes appear in the "STS" column.

    HINT:
    T or P appears.

    OK:
    At least 3 codes appear.



NG
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)
OK

REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY (Click here)