TOYOTA SEQUOIA 2001 Service Repair Manual

DID9R±01
I28312
R4R19R20
± DIAGNOSTICSAUDIO SYSTEM
DI±1969
2163 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. RADIO RECEIVER ASSY (SEPARATE TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
BU+B (R4±1) ± GND (R4±20)L±Y ± BRBatteryAlways10 to 14 V
ILL+ (R4±2) ± GND (R4±20)G ± BRIllumination (dimmer)
signalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
TX+ (R4±5) ± GND (R4±20)V ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
MUTE (R4±7) ± GND (R4±20)R±W ± BRMUTE signalAudio system is playing "changing
modeAbove 3.5 V "
Below 1 V
R+ (R4±8) ± GND (R4±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L+ (R4±9) ± GND (R4±20)B ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±10) ± Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
ACC+B (R4±11) ±
GND (R4±20)GR ± BRAccessory (ON)Turn ignition switch to OFF "ACC10 to 14 V
ILL± (R4±12) ± GND (R4±20)W±G ± BRIllumination (rheostat)
signalLight control switch TAILBelow 1 V "
10 to 14 V
ANT+B (R4±13) ±
GND (R4±20)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
TX± (R4±15) ± GND (R4±20)P ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
R± (R4±18) ± GND (R4±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sounds is
output
L± (R4±19) ± GND (R4±20)R ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R4±20) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
GND (R19±6) ± GND (R4±20)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V
SW1 (R19±7) ± GND (R4±20)LG±R ± BRSteering pad switch signal
Steering pad switch not operating.
"SEEK+ switch push
"SEEK± switch push
"VOL+ switch push
"VOL± switch push4 V or more
"Approx. 0.5 V
"Approx. 0.9 V
"Approx. 2.0 V
"Approx. 3.4 V
SW2 (R19±8) ± GND (R4±20)GR±R ± BRSteering pad switch signalSteering pad switch not operating
"MODE switch push4 V or more "
Below 2.5 V

DI±1970
± DIAGNOSTICSAUDIO SYSTEM
2164 Author: Date:
2005 SEQUOIA (RM1146U) (*1) TX1+ (R19±9) ±
GND (R4±20)
L ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*1) TX1± (R19±10) ±
GND (R4±20)LG ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*1) SLD1 (R19±14) ±
Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
(*1) RSR+ (R19±15) ±
GND (R4±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1) RSR± (R19±16) ±
GND (R4±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1) RSL+ (R19±17) ±
GND (R4±20)B ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1) RSL± (R19±18) ±
GND (R4±20)R ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*1) RMU (R19±19) ±
GND (R4±20)R±W ± BRMUTE signalAudio system is playing "
changing modeAbove 3.5 V "
Below 1 V
(*1) S±GND (R20±1) ±
Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
(*1) R+ (R20±2) ±
GND (R4±20)W ± BRSound signal
(Right input)Rear seat entertainment system is
playingA waveform synchro-
nized with sound is out-
put
(*1) R± (R20±3) ±
GND (R4±20)G ± BRSound signal
(Right input)Rear seat entertainment system is
playingA waveform synchro-
nized with sound is out-
put
(*1) L+ (R20±4) ± GND (R4±20)B ± BRSound signal
(Left input)Rear seat entertainment system is
playingA waveform synchro-
nized with sound is out-
put
(*1) L± (R20±5) ± GND (R4±20)R ± BRSound signal
(Left input)Rear seat entertainment system is
playingA waveform synchro-
nized with sound is out-
put
(*1) MUTE (R20±6) ±
GND (R4±20)R±G ± BRMUTE signalRear seat entertainment system is
playing " changing modeAbove 3.5 V "
Below 1 V
(*2) TX1+ (R19±9) ±
GND (R4±20)L ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*2) TX1± (R19±10) ±
GND (R4±20)LG ± BRAVC±LAN
communication signalIgnition switch ON2 to 3 V
(*2) SLD1 (R19±14) ±
Body groundShielded ±
Body groundShield groundAlwaysBelow 1 V
(*2) RSR+ (R19±15) ±
GND (R4±20)W ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*2) RSR± (R19±16) ±
GND (R4±20)G ± BRSound signal
(Right output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*2) RSL+ (R19±17) ±
GND (R4±20)B ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*2) RSL± (R19±18) ±
GND (R4±20)R ± BRSound signal
(Left output)Audio system is playing
A waveform synchro-
nized with sound is out-
put
(*2) RMU (R19±19) ±
GND (R4±20)R±W ± BRMUTE signalAudio system is playing "
changing modeAbove 3.5 V "
Below 1 V

I28313
R2R3R19
± DIAGNOSTICSAUDIO SYSTEM
DI±1971
2165 Author: Date:
2005 SEQUOIA (RM1146U)
*1: w/ Rear seat entertainment system
*2: w/ Rear seat audio system
2. RADIO RECEIVER ASSY (BUILT±IN TYPE AMPLIFIER)
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
FR+ (R2±1) ± GND (R2±7)LG ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL+ (R2±2) ± GND (R2±7)P ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
ACC+B (R2±3) ± GND (R2±7)GR ± BRAccessory (ON)Turn ignition switch to OFF " ACCBelow 1 V "
10 to 14 V
BU+B (R2±4) ± GND (R2±7)L±Y ± BRBatteryAlways10 to 14 V
FR± (R2±5) ± GND (R2±7)L ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL± (R2±6) ± GND (R2±7)V ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R2±7) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
ANT+B (R2±8) ± GND (R2±7)B±R ± BRPower source of antennaRadio switch ON and AM or FM10 to 14 V
ILL+ (R2±10) ± GND (R2±7)G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RR+ (R3±1) ± GND (R2±7)R ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
RL+ (R3±2) ± GND (R2±7)B ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
RR± (R3±3) ± GND (R2±7)W ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
ILL± (R3±5) ± GND (R2±7)W±G ± BRIllumination (rheostat) sig-
nalLight control switch OFF " TAIL or
HEADBelow 1 V "
10 to 14 V
RL± (R3±6) ± GND (R2±7)Y ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (R19±6) ± GND (R2±7)BR±W ± BRSteering pad switch
groundAlwaysBelow 1 V

I28722
S10S9 DI±1972
± DIAGNOSTICSAUDIO SYSTEM
2166 Author: Date:
2005 SEQUOIA (RM1146U) SW1 (R19±7) ± GND (R2±70)
LG±R ± BRSteering pad switch signal
Steering pad switch not operating.
"SEEK+ switch push
"SEEK± switch push
"VOL+ switch push
"VOL± switch push4 V or more
"Approx. 0.5 V
"Approx. 0.9 V
"Approx. 2.0 V
"Approx. 3.4 V
SW2 (R19±8) ± GND (R2±7)GR±R ± BRSteering pad switch signalSteering pad switch not operating
"MODE switch push4 V or more "
Below 2.5 V
3. STEREO COMPONENT AMPLIFIER ASSY
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecification
B+ (S9±1) ± E (S9±16)L±W ± BRBatteryAlways10 to 14 V
RL+ (S9±4) ± E (S9±16)B ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
RR+ (S9±5) ± E (S9±16)R ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
FL+ (S9±2) ± E (S9±16)P ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
FR+ (S9±3) ± E (S9±16)LG ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
WFL+ (S9±6) ±
E (S9±16)L±W ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
WFR+ (S9±7) ±
E (S9±16)R ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
B2+ (S9±10) ± E (S9±16)L±W ± BRBatteryAlways10 to 14 V
RL± (S9±13) ± E (S9±16)Y ± BRSound signal (Rear Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
RR± (S9±14) ± E (S9±16)W ± BRSound signal (Rear Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
GND (S9±15) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
E (S9±16) ± Body groundBR ±
Body groundGroundAlwaysBelow 1 V
FL± (S9±11) ± E (S9±16)V ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
FR± (S9±12) ± E (S9±16)L ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output

± DIAGNOSTICSAUDIO SYSTEM
DI±1973
2167 Author: Date:
2005 SEQUOIA (RM1146U) WFL± (S9±17) ±
E (S9±16)
G ± BRSound signal (Front Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
WFR± (S9±18) ±
E (S9±16)Y ± BRSound signal (Front Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
MUTE (S10±1) ± E (S9±16)R±W ± BRMute signal from radio
receiverAudio system is sounding "
changing modeAbove 3.5 V
"Below 1 V
L± (S10±2) ± E (S9±16)R ± BRSound signal from radio
receiver (Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
L+ (S10±3) ± E (S9±16)B ± BRSound signal from radio
receiver (Left)Audio system is playing
A waveform synchro-
nized with sounds is
output
R± (S10±4) ± E (S9±16)G ± BRSound signal from radio
receiver (Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
R+ (S10±5) ± E (S9±16)W ± BRSound signal from radio
receiver (Right)Audio system is playing
A waveform synchro-
nized with sounds is
output
SGND (S10±6) ± Body groundShielded ±
Body groundGroundAlwaysBelow 1 V
ACC (S10±12) ± E (S9±16)GR ± BRAccessory (ON)Turn ignition switch OFF "ACCBelow 1 V
"10 to 14 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
4. MULTI±DISPLAY CONTROLLER ASSY
See page DI±2090
5. REAR SEAT AUDIO CONTROLLER
See page DI±2051

DID9S±01
I24383
º1chº Switch
ºSEEK TRACKº
DOWN SwitchºSEEK TRACKº
UP SwitchºDISCº Switch º2chº Switchº3chº Switch
º4chº Switchº5chº Switch
º6chº Switch
DI±1974
± DIAGNOSTICSAUDIO SYSTEM
2168 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DIAGNOSTIC CHECK
(a) Starting Diagnostic Mode (All elements come on during the SW check mode).
(1) Turn off the audio system and turn the ignition switch to the ACC position. While pressing the
preset switches º1º and º6º at the same time, press the ºDISCº 3 times.
(2) Reference:
When the system enters the Diagnosis Mode, a beep sound is emitted 3 times and all the
elements come on during the SW check mode.
It takes about 40 seconds to complete the check.
Turn all the elements in the LCD on.
When pressing the switch, confirm beep sound is emitted.
(b) Service Check Screen.
(1) Press the ºSEEK TRACKº switch to enter the ºService Check Screenº.
(2) In the service check mode, the system check and the diagnostic memory check are performed,
and the check results are displayed in ascending order of the component codes (physical ad-
dress.)
TermsMeaning
Component code
(Physical address)Three±digit code (In hexadecimal) given to each device comprising AVC±LAN.
Corresponding to its function, individual symbol is provided.
Logical addressTwo±digit code (In hexadecimal) given to each function and device unit in each
device comprising AVC±LAN.
Code No. (physical address) List
Code No.
(physical address)Equipment name
190Radio receiver assy (Audio head unit)
440Stereo component amplifier assy
1F6Multi±display controller (RSE ECU)
1F4Rear seat audio controller
(c) Finishing Diagnostic Mode.
Press the ºDISCº for 2 seconds or more, or turn the ignition switch off.

± DIAGNOSTICSAUDIO SYSTEM
DI±1975
2169 Author: Date:
2005 SEQUOIA (RM1146U)
(d) Service Check Mode Result Display (for checking the current and the past system conditions).
(1) Press the ºSEEK TRACKº switch to see the check result of each component.
I28309
The illustration shows the case that the system has 2 devices with codes 190 and 360, and the device (code
360) has a trouble.
The check result is displayed in ascending order of device code. The device code is displayed first, and then
the check result.P±±±indicates physical address
190±±±physical address
good±±±ºThe component is normalº.
P±±±indicates physical address
360±±±physical address
CHEC±±±ºCheck neededº.
: TUNE/TRACK UP
: TUNE/TRACK DOWN

DI±1976
± DIAGNOSTICSAUDIO SYSTEM
2170 Author: Date:
2005 SEQUOIA (RM1146U)
(2) Check Result Display.
DisplayOriginal LanguageMeaningAction to be taken
goodGood (normal)No DTCs are detected in both ºSystem Check Modeº and
ºDiagnostic Memory Modeº.±
NCONNo connection
The system recognized the component when it was regis-
tered, but the component gives no response to the ºDiagnos-
tic Mode ON Requestº.
Check the power source cir-
cuit and the communication
circuit of the component indi-
cated by the component
code (physical address).
ECHNExchangeOne or more DTCs for ºExchangeº are detected in either
ºSystem Check Modeº or ºDiagnostic Memory Modeº.
Go to the detailed informa-
tion mode to check the
trouble area referring to the
DTC list.
CHECCheck
When no DTCs are detected for ºExchangeº, one or more
DTCs for ºCheckº are detected in either ºSystem Check
Modeº or ºDiagnostic Memory Modeº.Go to the detailed informa-
tion mode to check the
trouble area referring to the
DTC list.
OLDOld versionOld DTC application is identified and DTC is detected in ei-
ther ºSystem Check Modeº or ºDiagnostic Memory Modeº.±
NRESNo response
The device gives no response to any one of ºSystem Check
Mode ON Requestº, ºSystem Check Result Requestº and
ºDiagnostic Memory Requestº.
Check the power source cir-
cuit and the communication
circuit of the component indi-
cated by the component
code (physical address).
(3) To perform the Service Check again, press the preset switch º1º.
(e) Detailed Information Mode (when displaying the DTC for a trouble component)
(1) With ºCHECº or ºECHNº being displayed, press the preset switch º2º to go to the detailed informa-
tion mode.
(2) Press the ºSEEK TRACKº switch to display the ºSystem Check Result (SYS)º and ºDiagnostic
Memory Response (CODE)º.

I28310
Service Check Mode
Detailed Information ModeDISC/CH/PROG DOWN
Detailed information
of the first code
is displayed
Detailed information
of the second code
is displayed
Continue to display detailed information
when more than one DTC is detected.
The illustration shows the case that the component with code 190 has DTC º47º and ºdCº as a result of the
system check and the diagnosis memory response.
The detailed information mode shows the system check result first, then the diagnosis memory response result.
(*1): As for DTC that does not have any sub code, sub code is not displayed.P±±±indicates physical address
190±±±physical address
SYS±±±system check result
P±±±indicates physical address
360±±±sub code
6F±±±connection
check number 1±±±the first code
62±±±logical address
DC±±±DTC CODE±±±diagnosis memory
response result
2±±±the second code
01±±±logical address
05±±±the number of times of
occurrence
(in decimal) 47±±±DTC
Continue to display detailed information
when more than one DTC is detected.*

From *

To *
(*1)
: TUNE/TRACK UP
: TUNE/TRACK DOWN
DISC/CH/PROG UP
± DIAGNOSTICSAUDIO SYSTEM
DI±1977
2171 Author: Date:
2005 SEQUOIA (RM1146U)

DI±1978
± DIAGNOSTICSAUDIO SYSTEM
2172 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Displayed Items in Detailed Information Mode
Division Code for
DTC displayMeaning
The order of detailed information displayed when the ºTUNE
UPº switch is pressed. (The order is reversed when the
ºTUNE DOWNº switch is pressed.)
SYSSystem check result is displayed.Logical address "
DTC
CODEDiagnostic memory check result is displayed.
Logical address"
DTC"
Sub code"
Connection confirmation number"
The number of times of occurrence
(4) Check the trouble area referring to the DTC list.
(5) To return to the service check mode, press the preset switch º3º.
2. DTC CLEAR
(a) Clearing Individual DTC Memory (when clearing the memory of the DTC detected in the past individual-
ly)
Press the preset switch º5º for 2 seconds or more while the ºECHNº is displayed in the service check
mode or during the detailed information mode.
HINT:
Beep sound is emitted once when the DTC memory is completely cleared.
When the DTC memory is cleared, only the component code (physical address) is displayed for the
target component.
To check DTCs, press the preset switch º1º and perform the service check again.
(b) Clearance of all the DTC memory (when clearing all the memory of the DTCs detected in the past)
(1) Start the diagnostic mode after repairing the trouble area.
(2) Press the preset switch º5º for 2 seconds or more (ºCLRº is displayed at this time).
HINT:
Beep sound is emitted once when the DTC memory is completely cleared.
When the DTC memory for all the component is cleared, only the component codes (physical address)
are displayed.
(3) Press the preset switch º1º to perform the service check again, and check that no DTCs are dis-
played for all the component codes (physical address).
(c) Finishing Diagnostic Mode.
Press the ºDISCº for 2 seconds or more, or turn the ignition switch off.