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

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Poor Sound Quality in All Modes (Low Volume)

PROCEDURE 1. CHECK AUDIO SETTINGS (a) Set "Treble", "Mid" and "Bass" to the initial values and check that sound is normal. OK: Malf ...

Cursor or Map Rotates when Vehicle Stopped

PROCEDURE 1. CHECK CONDITION (a) Check with the customer if the vehicle has been turned by a turntable. OK: Vehicle has not been turned by a turntab ...

Other materials:

Short in GPS Antenna (B15C0,B15C1)
DESCRIPTION These DTCs are stored when a malfunction occurs in the navigation antenna assembly. DTC No. DTC Detection Condition Trouble Area B15C0 Navigation antenna error Navigation antenna assembly Radio and ...

Light bulbs
You may replace the following bulbs yourself. The difficulty level of replacement varies depending on the bulb. If necessary bulb replacement seems difficult to perform, contact your Toyota dealer. For more information about replacing other light bulbs, contact your Toyota dealer. ■ Prep ...