Page 2377 of 4323

BE2820
Multi±path:
BE2821
Fade Out:
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2175
2369 Author: Date:
2005 SEQUOIA (RM1146U)
(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 ºMul-
ti±pathº.
(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 ºfade outº.
(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 FrequencyNoise occurrence conditionPresumable cause
AMNoise occurs in a specified areaForeign noise
AMNoise occurs when listening to an intermittent
broadcastAn identical program transmitted from multiple
towers can cause noise where the signals over-
lap
AMNoise occurs only at nightMusic beat from a far±off broadcast
FMNoise occurs while driving in a specified areaMulti±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 ºRadio reception
problemsº above. Refer to the multi±path and phasing sections.
Page 2378 of 4323
DIDBV±01
I28218
I28219
I28220
DI±2176
± DIAGNOSTICSNAVIGATION SYSTEM
2370 Author: Date:
2005 SEQUOIA (RM1146U)
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 ºDisplay Checkº from the ºDiagnosis MENUº
screen.
3. Select ºColor Bar Checkº from the ºDisplay Checkº
screen.
4. Select a color bar from the ºColor Bar Check Modeº
screen.
HINT:
The entire screen turns to the color or stripe selected.
Touching the display will return to the ºColor Bar Checkº
screen.
Page 2379 of 4323
DIDBW±01
I28218
I28221
I28222
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2177
2371 Author: Date:
2005 SEQUOIA (RM1146U)
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 ºDisplay Checkº from the ºDiagnosis MENUº
screen.
3. Select ºTouch Switch Checkº from the ºDisplay
Checkº screen.
4. Touch the display anywhere in the open area to per-
form the check when the ºTouch Switch Checkº
screen is displayed.
HINT:
A º+º mark is displayed where the display is touched.
The º+º mark remains on the display even after the finger
is removed.
Page 2380 of 4323

DIDBX±01
I28218
I28223
*1
*2 *3
I28224
DI±2178
± DIAGNOSTICSNAVIGATION SYSTEM
2372 Author: Date:
2005 SEQUOIA (RM1146U)
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 ºDisplay Checkº from the ºDiagnosis MENUº
screen.
3. Select ºPanel Switch Checkº from the ºDisplay
Checkº screen.
4. Operate each switch and check that the switch name
and condition are correctly displayed.
HINT:
Pressing the ºDISPLAYº switch for 3 seconds will exit the
diagnostic mode.
ºOPENº and ºTILTº switches are not displayed. To test
these switches, they must be operated.
DisplayContents
Push switch name/*1Name of the pressed switch is displayed.
If more than one switch is pressed, ºMULTIPLEº is displayed.
Rotary switch name/*2Name of the rotary switch is displayed.
Rotary switch direction/*3Direction of the rotary switch is rotated.
Page 2381 of 4323
DIDBY±01
I28218
I28225
I28226 PKB OFF
REV OFFSPEED 49km/h
TAIL OFF
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2179
2373 Author: Date:
2005 SEQUOIA (RM1146U)
DISPLAY CHECK MODE (Vehicle Signal Check)
HINT:
This mode checks the vehicle signal status input to 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 ºDisplay Checkº from the ºDiagnosis MENUº
screen.
3. Select ºVehicle Signal Checkº from the ºDisplay
Checkº screen.
4. When the ºVehicle Signal Check Modeº screen is dis-
played, check all the vehicle signal conditions.
HINT:
Only conditions having inputs are displayed.
This screen is updated once per second when input sig-
nals to the vehicle are changed.
Page 2382 of 4323
DIDBZ±01
I28227
I28228
I28229
DI±2180
± DIAGNOSTICSNAVIGATION SYSTEM
2374 Author: Date:
2005 SEQUOIA (RM1146U)
NAVIGATION CHECK MODE (GPS Information)
HINT:
This mode displays GPS satellite information.
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 ºNavigation Checkº from the ºDiagnosis
MENUº screen.
3. Select ºGPS Informationº from the ºNavigation
Checkº screen.
4. When GPS information is displayed, check the GPS
conditions.
HINT:
This screen is updated once per second when input signals to
the vehicle are changed.
Page 2383 of 4323
DIDC0±01
I28227
I28230
I28231
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2181
2375 Author: Date:
2005 SEQUOIA (RM1146U)
NAVIGATION CHECK MODE (Vehicle Sensors)
HINT:
This mode checks the vehicle signal status input to 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 ºNavigation Checkº from the ºDiagnosis
MENUº screen.
3. Select ºVehicle Sensorsº from the ºNavigation
Checkº screen.
4. Check all the signals and sensors when vehicle sig-
nal information is displayed.
HINT:
This screen is updated once per second when input signals to
the vehicle are changed.
Page 2384 of 4323
DIDC1±01
I28227
I28232
I28233
DI±2182
± DIAGNOSTICSNAVIGATION SYSTEM
2376 Author: Date:
2005 SEQUOIA (RM1146U)
NAVIGATION CHECK MODE (Navi 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 ºNavigation Checkº from the ºDiagnosis
MENUº screen.
3. Select ºColor Bar Checkº from the ºNavigation
Checkº screen.
4. Check each color of the color bar when the ºNAVI Col-
or Bar Checkº screen is displayed.
HINT:
Colors will not be displayed full±screen as in ºDisplay Check
Modeº.