2001 TOYOTA SEQUOIA Page 18

DIDC2±01
I28227
I28234
I28235
*1
*2
*3
*4
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2183
2377 Author: Date:
2005 SEQUOIA (RM1146U)
NAVIGATION CHECK MODE (Parts Information)
HINT:

This mode displays product information on the radio and navigation assy and discs.

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 ºParts Informationº from the ºNavigation
Checkº screen.
4. Check the navigation and disc information when the
ºParts Informationº screen is displayed.
DisplayContents
Navigation Manufacturer/*1Radio and navigation assy manufacturer name is displayed.
Navigation Version/*2Radio and navigation assy version is displayed.
Disc Manufacturer/*3Map disc manufacturer is displayed.
Disc Version/*4Map disc version is displayed.

DIDC3±01
DI±2184
± DIAGNOSTICSNAVIGATION SYSTEM
2378 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:

Before performing verification listed in the table below, check the fuse and relay.

Methods used to verify the cause of the problem are listed in order of probability in the verification col-
umn.
Display function
SymptomVerificationSee page
Pressing PWR switch does not turn on system.
1. ºPRESSING POWER SWITCH DOES NOT TURN ON
SYSTEMº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2213
DI±2256
±
Black screen (no image appears on navigation and audio screen).
1. ºBLACK SCREEN (NO IMAGE APPEARS ON NAV-
IGATION AND AUDIO SCREEN)º
2. Illumination circuit
3. Power source circuit (radio and navigation assy)
4. Replace radio and navigation assyDI±2214
DI±2260
DI±2256
±
Illumination for panel switch does not come on with TAIL switch
on.
1. ºILLUMINATION FOR PANEL SWITCH DOES NOT
COME ON WITH TAIL SWITCH ONº
2. Illumination circuit
3. Replace radio and navigation assyDI±2216
DI±2260
±
Display does not dim (night screen) with TAIL switch on.
1. ºDISPLAY DOES NOT DIM (NIGHT SCREEN) WITH
TAIL SWITCH ONº
2. Illumination circuit
3. Replace radio and navigation assyDI±2217
DI±2260
±
Power does not turn off (screen remains on).1. Power source circuit (radio and navigation assy)
2. Replace radio and navigation assyDI±2256
±
Panel switch does not function.
1. ºPANEL SWITCH DOES NOT FUNCTIONº
2. Steering pad switch circuit
3. Replace radio and navigation assyDI±2218
DI±2287
±
Touch panel switch does not function.
1. ºTOUCH PANEL SWITCH DOES NOT FUNCTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2219
DI±2256
±
Display panel does not open, tilt, or tilts improperly.
1. ºDISPLAY PANEL DOES NOT OPEN, TILT, OR TILTS
IMPROPERLYº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2220
DI±2256
±
Screen is distorted.1. Power source circuit (radio and navigation assy)
2. Replace radio and navigation assyDI±2256
±
Screen flicker or color distortion.
1. ºSCREEN FLICKER OR COLOR DISTORTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2221
DI±2256
±
Audio function
SymptomVerificationSee page
No sound can be heard from speakers (audio is mute).
1. ºNO SOUND CAN BE HEARD FROM SPEAKERS
(AUDIO IS MUTE)º
2. Speaker circuit
3. AVC±LAN circuit (radio and navigation ± stereo compo-
nent amplifier)
4. Amplifier sound signal circuit
5. Amplifier mute signal circuit
6. Replace stereo component amplifier
7. Replace radio and navigation assyDI±2224
DI±2282
DI±2268
DI±2274
DI±2271
±
±

± DIAGNOSTICSNAVIGATION SYSTEM
DI±2185
2379 Author: Date:
2005 SEQUOIA (RM1146U) Radio broadcast cannot be received (poor reception).
1. ºRADIO BROADCAST CANNOT BE RECEIVED
(POOR RECEPTION)º
2. Replace radio and navigation assyDI±2225
±
CD cannot be inserted/played or CD is ejected right after inser-
tion.
1. ºCD CANNOT BE INSERTED/PLAYED OR CD IS
EJECTED RIGHT AFTER INSERTIONº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2228
DI±2256
±
CD cannot be ejected.
1. ºCD CANNOT BE EJECTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2231
DI±2256
±
Abnormal noise occurs.
1. ºABNORMAL NOISE OCCURSº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2233
DI±2256
±
CD sound skips.1. ºCD SOUND SKIPSº
2. Replace radio and navigation assyDI±2234
±
Poor sound quality in all modes (low volume).
1. ºPOOR SOUND QUALITY IN ALL MODES (LOW VOL-
UME)º
2. AMP mute signal circuit
3. Replace radio and navigation assy
4. Replace stereo component amplifierDI±2236
DI±2271
±
±
Navigation function
SymptomVerificationSee page
Map disc cannot be inserted.
1. ºMAP DISC CANNOT BE INSERTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2237
DI±2256
±
Map disc cannot be ejected.
1. ºMAP DISC CANNOT BE EJECTEDº
2. Power source circuit (radio and navigation assy)
3. Replace radio and navigation assyDI±2238
DI±2256
±
Vehicle position mark deviates greatly.
1. ºVEHICLE POSITION MARK DEVIATES GREATLYº
2. Replace GPS antenna assy
3. Replace radio and navigation assyDI±2239
±
±
Cursor or map rotates when vehicle is stopped.
1. ºCURSOR OR MAP ROTATES WHEN VEHICLE IS
STOPPEDº
2. Replace radio and navigation assyDI±2241
±
Vehicle position mark is not updated.
1. ºVEHICLE POSITION MARK IS NOT UPDATEDº
2. Replace map disc
3. Replace radio and navigation assyDI±2242
±
±
Current position display does not appear.
1. ºCURRENT POSITION DISPLAY DOES NOT AP-
PEARº
2. Replace map disc
3. Replace radio and navigation assyDI±2244
±
±
GPS mark does not displayed.
1. ºGPS MARK IS NOT DISPLAYEDº
2. Replace GPS antenna assy
3. Replace radio and navigation assyDI±2245
±
±
Voice guidance does not function.
1. ºVOICE GUIDANCE DOES NOT FUNCTIONº
2. Speaker circuit
3. Replace map disc
4. Replace radio and navigation assyDI±2248
DI±2282
±
±

DI±2186
± DIAGNOSTICSNAVIGATION SYSTEM
2380 Author: Date:
2005 SEQUOIA (RM1146U) Map display incomplete.
1. ºMAP DISPLAY INCOMPLETEº
2. Replace map disc
3. Replace radio and navigation assyDI±2251
±
±
Route cannot be calculated.
1. ºROUTE CANNOT BE CALCULATEDº
2. Replace map disc
3. Replace radio and navigation assyDI±2252
±
±
Steering pad switch assy function
SymptomVerificationSee page
The system cannot be operated by the steering pad switch.1. Steering pad switch circuit
2. Replace radio and navigation assyDI±2287
±
Illumination for steering pad switch does not come on with TAIL
switch on.1. Steering pad switch circuit
2. Replace radio and navigation assyDI±2287
±

DI±2188
± DIAGNOSTICSNAVIGATION SYSTEM
2382 Author: Date:
2005 SEQUOIA (RM1146U) SW2 (R27±8) ± SWG (R27±6)
GR±R ± BR±WSteering pad switch signalSteering pad switch not operated
"MODE switch pushed4 V or more
"Below 2.5 V
SPD (R29±3) ± GND (R30±20)G±O ± BRSpeed signal from com-
bination meterSee ºVehicle Signal Check Modeº
(See page DI±2179)±
REV (R29±5) ± GND (R30±20)B±Y ± BRReverse signal from com-
bination meterSee ºVehicle Signal Check Modeº
(See page DI±2179)±
MUTE (R28±7) ±
GND (R30±20)R±W ± BRMUTE signal
(From navigation)Audio system is playing " chang-
ing modeAbove 3.5 V "
Below 1 V
SLD (R30±10) ± Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
SWG (R27±6) ± Body groundBR±W ±
Body groundSteering pad switch
groundAlwaysBelow 1 V
ATX+ (R30±5) ± GND (R30±20)V ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
ATX± (R30±15) ±
GND (R30±20)P ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
IVO+ (R27±11) ±
GND (R30±20)W ± BRVoice guidance output
signalNavigation system is voice guid-
ance outputA waveform synchro-
nized with sound is out-
put
IVO± (R27±12) ±
GND (R30±20)B ± BRVoice guidance output
signalNavigation system is voice guid-
ance outputA waveform synchro-
nized with sound is out-
put
SLD1 (R27±13) ± Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
PKB (R29±1) ± GND (R30±20)LG±R ± BRParking brake switch sig-
nalParking brake pedal is depress "Below 1 V "
10 to 14 V
(*1) NTSC (R26±1) ±
GND (R30±20)R ± BRDisplay signal (From mul-
ti±display controller)Navigation display is ONPulse generation
(*1) SGD1 (R26±4) ±
Body groundG ± Body groundGroundAlwaysBelow 1 V
(*1) SGND (R26±5) ±
Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
(*1, 2) TX+ (R27±9) ±
GND (R30±20)L ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*1, 2) TX± (R27±10) ±
GND (R30±20)LG ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*1, 2) R±R+ (R27±15) ±
GND (R30±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1, 2) R±R± (R27±16) ±
GND (R30±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1, 2) R±L+ (R27±17) ±
GND (R30±20)B ± BRSound signal (Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1, 2) R±L± (R27±18) ±
GND (R30±20)R ± BRSound signal (Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1) RSLD (R27±14) ±
Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
(*1, 2) RMUT (R27±19) ±
GND (R30±20)R±W ± BRMUTE signal (To multi±
display controller)Audio system is playing " chang-
ing modeAbove 3.5 V "
Below 1 V
(*1) CDR+ (R28±2) ±
GND (R30±20)W ± BRSound signal (Right input)Rear seat entertainment system is
playingA waveform synchro-
nized with sound is out-
put

DI±2190
± DIAGNOSTICSNAVIGATION SYSTEM
2384 Author: Date:
2005 SEQUOIA (RM1146U) E (S9±16) ± Body ground
BR ±
Body groundGroundAlwaysBelow 1 V
FL± (S9±11) ± E (S9±16)V ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sound is out-
put
FR± (S9±12) ± E (S9±16)L ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sound is out-
put
WFL± (S9±17) ± E (S9±16)G ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sound is out-
put
WFR± (S9±18) ± E (S9±16)Y ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sound is out-
put
MUTE (S10±1) ± E (S9±16)R±W ± BRMute signal from radio
receiverAudio system is sounding " chang-
ing modeAbove 3.5 V
"Below 3.5 V
L± (S10±2) ± E (S9±16)R ± BRSound signal from radio
receiver (Left)Audio system is playing
A waveform synchro-
nized with sound is out-
put
L+ (S10±3) ± E (S9±16)B ± BRSound signal from radio
receiver (Left)Audio system is playing
A waveform synchro-
nized with sound is out-
put
R± (S10±4) ± E (S9±16)G ± BRSound signal from radio
receiver (Right)Audio system is playing
A waveform synchro-
nized with sound is out-
put
R+ (S10±5) ± E (S9±16)W ± BRSound signal from radio
receiver (Right)Audio system is playing
A waveform synchro-
nized with sound is out-
put
SGND (S10±6) ± Body groundShielded ±
Body groundGroundAlwaysBelow 1 V
TX± (S10±19) ± E (S9±16)P ± BRAVC±LAN
communication signalTurn ignition switch to ACC2 to 3 V
TX+ (S10±20) ± E (S9±16)V ± BRAVC±LAN
communication signalTurn ignition switch to ACC2 to 3 V
ACC (S10±12) ± E (S9±16)GR ± BRAccessory (ON)Turn ignition switch OFF "ACCBelow 1 V
"10 to 14 V
INT± (S10±22) ± E (S9±16)B ± BRVoice guidance signalVoice guidance
A waveform synchro-
nized with sound is out-
put
INT+ (S10±23) ± E (S9±16)W ± BRVoice guidance signalVoice guidance
A waveform synchro-
nized with sound is out-
put
3. MULTI±DISPLAY CONTROLLER ASSY
See page DI±2090
4. REAR SEAT AUDIO CONTROLLER
See page DI±2051

DIDC6±01
I28208Logical AddressDiagnostic Code
I28209
Logical AddressDiagnostic Code
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2199
2393 Author: Date:
2005 SEQUOIA (RM1146U)
CHECK MODE PROCEDURE
1. SYSTEM CHECK MODE (DTC CHECK)
HINT:
Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore,
some detailed areas may not be shown exactly the same as on the actual vehicle.
(a) Start the diagnostic mode (See page DI±2191).
(b) Read the system check result.
If all check results are ºEXCH,º ºCHEKº or ºOld,º touch the dis-
play to check the contents on the ºUnit Check Modeº screen and
record them on the customer problem analysis check sheet.
HINT:

If all check results are ºOK,º go to communication DTC
check (go to step c).

If a device name is not known, its physical address is dis-
played.
HINT:
If ºEXCHº, ºCHEKº and ºOldº as well as ºOKº exist, press the
service switch to return to the ºSystem Check Modeº. Then,
check the ºUnit Check Modeº screen and record them on the
customer problem analysis check sheet.

I28212
I28213
I28214
± DIAGNOSTICSNAVIGATION SYSTEM
DI±2201
2395 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:
If check results of other devices are ºCHEK,º press the ºServiceº
switch to return to the original ºLAN Monitorº screen. Then,
check the individual communication diagnostic screen for the
next device and record the result on the customer problem anal-
ysis check sheet.
2. SYSTEM CHECK MODE (DTC CLEAR/RECHECK)
HINT:
Illustrations may differ from the actual vehicle depending on the device settings and options. Therefore,
some detailed areas may not be shown exactly the same as on the actual vehicle.
(a) Enter diagnostic mode (See page DI±2191).
(b) Clear DTC
(1) Press the ºCode CLRº switch for 3 seconds.
(2) Check result is cleared.
(c) Recheck
(1) Press the ºRecheckº switch.