Toyota Sequoia (2005). Manual - part 595

BE2820

Multi–path:

BE2821

Fade Out:

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2175

2369

(2)

Multi–path
A radio signal can sometimes be reflected by an ob-
struction in its path. When this occurs, the reflected
signal may interfere with the direct signal sent from
the transmitter. This phenomenon is known as ”Mul-
ti–path”.

(3)

Fade out
FM radio frequency is higher than AM. Therefore, it
is more likely to be reflected by large obstructions
such as tall buildings or mountains. For this reason,
the FM signal will gradually weaken or disappear
when the vehicle is behind such obstructions. This
phenomenon is known as ”fade out”.

(d)

Noise problem
It is very important for a technician to understand the specifics of the noise problem. To diagnose the
symptom, use the table below.

Radio Frequency

Noise occurrence condition

Presumable cause

AM

Noise occurs in a specified area

Foreign noise

AM

Noise occurs when listening to an intermittent

broadcast

An identical program transmitted from multiple

towers can cause noise where the signals over-

lap

AM

Noise occurs only at night

Music beat from a far–off broadcast

FM

Noise occurs while driving in a specified area

Multi–path or phasing noise resulting from a

change in FM frequency

HINT:
If the noise does not fall into any category in the table above, determine the cause using ”Radio reception
problems” above. Refer to the multi–path and phasing sections.

DIDBV–01

I28218

I28219

I28220

DI–2176

–

DIAGNOSTICS

NAVIGATION SYSTEM

2370

DISPLAY CHECK MODE (Color Bar Check)

HINT:

This mode checks the color display on the radio and navigation assy.

Illustrations may differ from the actual vehicle depending on the device settings and options. There-
fore, some detailed areas may not be shown exactly the same as on the actual vehicle.

1.

Enter diagnostic mode (See page 

DI–2191

).

2.

Select ”Display Check” from the ”Diagnosis MENU”
screen.

3.

Select ”Color Bar Check” from the ”Display Check”
screen.

4.

Select a color bar from the ”Color Bar Check Mode”
screen.

HINT:

The entire screen turns to the color or stripe selected.

Touching the display will return to the ”Color Bar Check”
screen.

DIDBW–01

I28218

I28221

I28222

–

DIAGNOSTICS

NAVIGATION SYSTEM

DI–2177

2371

DISPLAY CHECK MODE (Touch Switch Check)

HINT:

This mode checks the touch switch operation condition on the radio and navigation assy.

Illustrations may differ from the actual vehicle depending on the device settings and options. There-
fore, some detailed areas may not be shown exactly the same as on the actual vehicle.

1.

Enter diagnostic mode (See page 

DI–2191

).

2.

Select ”Display Check” from the ”Diagnosis MENU”
screen.

3.

Select ”Touch Switch Check” from the ”Display
Check” screen.

4.

Touch the display anywhere in the open area to per-
form the check when the ”Touch Switch Check”
screen is displayed.

HINT:

A ”+” mark is displayed where the display is touched.

The ”+” mark remains on the display even after the finger
is removed.

DIDBX–01

I28218

I28223

*1

*2

*3

I28224

DI–2178

–

DIAGNOSTICS

NAVIGATION SYSTEM

2372

DISPLAY CHECK MODE (Panel Switch Check)

HINT:

This mode checks the panel switch operation response on the radio and navigation assy.

Illustrations may differ from the actual vehicle depending on the device settings and options. There-
fore, some detailed areas may not be shown exactly the same as on the actual vehicle.

1.

Enter diagnostic mode (See page 

DI–2191

).

2.

Select ”Display Check” from the ”Diagnosis MENU”
screen.

3.

Select ”Panel Switch Check” from the ”Display
Check” screen.

4.

Operate each switch and check that the switch name
and condition are correctly displayed.

HINT:

Pressing the ”DISPLAY” switch for 3 seconds will exit the
diagnostic mode.

”OPEN” and ”TILT” switches are not displayed. To test
these switches, they must be operated.

Display

Contents

Push switch name/*1

Name of the pressed switch is displayed.

If more than one switch is pressed, ”MULTIPLE” is displayed.

Rotary switch name/*2

Name of the rotary switch is displayed.

Rotary switch direction/*3

Direction of the rotary switch is rotated.