Toyota Sequoia (2005). Manual - part 612

I28261

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2243

2437

3

Navigation check mode (Vehicle sensors check).

PREPARATION:
Enter the ”Navigation Check” mode (Vehicle Sensors) (See
page 

DI–2176

).

CHECK:
While driving, compare the ”SPD” indicator to the reading on the
speedometer. Check if these readings are almost the same.
OK:

The readings are almost the same.

NG

Go to ”speed signal circuit” in flow chart 
(See page 

DI–2291

).

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–2184

).

I28263

I28258

DI–2244

–

DIAGNOSTICS

NAVIGATION SYSTEM

2438

Current position display does not appear

INSPECTION PROCEDURE

1

Check radio and navigation assy.

CHECK:
Check if a map disc is inserted in the map disc slot.
OK:

A map disc is inserted.

NG

Insert map disc in ”MAP” side slot.

OK

2

Check map disc.

CHECK:
Check that the map disc is not deformed or cracked.
OK:

No deformations or cracks appear on the map disc.

NG

Replace map disc.

OK

Proceed to next circuit inspection shown in problem symptoms table (See page 

DI–2184

).

DIDD0–01

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2245

2439

GPS mark is not displayed

INSPECTION PROCEDURE

1

Check cabin.

CHECK:
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:
GPS works using extremely weak radio waves originating from satellites. If the signal is interrupted by ob-
structions or another radio wave, the GPS system may not be able to properly receive the signal.
OK:

Mark appears.

OK

Normal operation.

NG

2

Check surroundings.

CHECK:
Check if the vehicle is in a location where GPS signal reception is bad. If the vehicle is in such a place, move
it elsewhere and check if the GPS mark reappears.
HINT:

GPS uses 24 satellites in 6 orbits so that at any time 4 satellites will be in line–of–sight of your vehicle.

GPS signals may not be received, however, based on surroundings, vehicle direction, and time.

DIDD1–01

I28264

In a tunnel

In a building

Under an overpass

Forest or tree–lined path

Between tall buildings

Under a cliff, overhang

DI–2246

–

DIAGNOSTICS

NAVIGATION SYSTEM

2440

The following illustrations show some conditions where it may be difficult to receive GPS signals.

OK:

GPS mark is displayed.

OK

Returns to normal.

NG