Toyota Tacoma (2015-2018) Service Manual: Vehicle Position Mark Deviates Greatly

Toyota Tacoma (2015-2018) Service Manual / Navigation / Multi Info Display / Navigation System / Vehicle Position Mark Deviates Greatly

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK CABIN

(a) 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.

NORMAL OPERATION

2.	CHECK SURROUNDINGS

(a) 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.

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	-	-

OK:

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

SYSTEM RETURNS TO NORMAL

3.	CHECK GPS INFORMATION (OPERATION CHECK)

(a) Enter the "System Sensor Check" screen. Refer to Check GPS & Vehicle Sensors in Operation Check (See page ).

(b) Check how many of the following codes appear in the "Reception number" column.

HINT:

T or P appears.

OK:

At least 3 codes appear.

REPLACE NAVIGATION RECEIVER ASSEMBLY

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