Navigation System Vehicle Position Mark Deviates Greatly

Audio Visual Telematics. Corolla. Zre142 Aze141
Navigation Multi Info Display. Corolla. Zre142 Aze141

INSPECTION PROCEDURE

CHECK CABIN

CHECK SURROUNDINGS

CHECK GPS INFORMATION (OPERATION CHECK)

CHECK VEHICLE SIGNAL (OPERATION CHECK)

NAVIGATION SYSTEM - Vehicle Position Mark Deviates Greatly


INSPECTION PROCEDURE

NOTICE:
  1. If standard size tires are not installed, the vehicle position mark may deviate from the route even if the navigation system is operating normally.
  2. Make sure that standard size tires are installed to the vehicle before inspection.
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 vehicle position mark returns to the appropriate position.

    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:
    After driving for a while, the vehicle position mark returns to the appropriate position.


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 location, move the vehicle and check if the vehicle position mark returns to the appropriate position.

    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.

    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Vehicle Position Mark Deviates Greatly

    OK:
    After driving for a while, the vehicle position mark returns to the appropriate position.

    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)


    Corolla. Zre142 Aze141.Navigation Multi Info Display.Navigation System.Navigation System Vehicle Position Mark Deviates Greatly

  1. Display the "Location & GPS Information" screen.

  1. Check that the actual vehicle location and current location information displayed on the screen match.

    OK:
    Actual vehicle location and current location information displayed on the screen match.
    Text in Illustration
    *a
    		Example


NG
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0H9X.html)
OK


4.CHECK VEHICLE SIGNAL (OPERATION CHECK)

  1. Enter the "Vehicle Signal Check Mode" screen. Refer to Check Vehicle Signal in Operation Check (COROLLA_ZRE142 RM000003SKF0AEX.html)

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (COROLLA_ZRE142 RM0000011BR0H9X.html)