engine TOYOTA SEQUOIA 2001 Service Repair Manual

DI±1606
± DIAGNOSTICSCOMBINATION METER SYSTEM
1800 Author: Date:
2005 SEQUOIA (RM1146U)
Input and output signals of each ECU
Transmitting ECU
(transmitter)Receiving ECUSignalsCommunication
method
A/C ECU

Combination meter

Driver door control ECU

Passenger door control ECU
Temperature dataBEAN
A/C ECUCombination meterEngine coolant temperature dataBEAN
Combination meter

A/C ECU

Body ECU

Driver door control ECU

Passenger door control ECU

Back door ECU
Vehicle speed signalBEAN
Combination meter
Body ECU

Seat control ECUShift position signalBEAN
Combination meter

A/C ECU

Body ECU

Driver door control ECU

Passenger door control ECU

Back door ECU
Meter activation signalBEAN
Combination meterA/C ECUDisplay unit demand signalBEAN
Combination meterBody ECUEngine system signalBEAN
Body ECU

A/C ECU

Combination meter

Driver door control ECU

Passenger door control ECU

Seat control ECU

Sliding roof control ECU

Back door ECU
Diagnosis tool demand signalBEAN
Body ECU
A/C ECU

Combination meterBody control system signal (HEAD
signal, TAIL signal)BEAN
Body ECU

Combination meter

Driver door control ECU

Passenger door control ECU

Seat control ECU

Sliding roof control ECU

Back door ECU
Body control system signal (IG
signal, ACC signal, All door cour-
tesy lamp signal, Door lock signal,
Door unlock signal)
BEAN
Body ECU

Combination meter

Driver door control ECU

Passenger door control ECU

Seat control ECU

Sliding roof control ECU

Back door ECU
Body ECU activation signalBEAN
Body ECU

Combination meter

Driver door control ECU

Seat control ECUBody control system signal (KSW
signal)BEAN
Body ECU

Combination meter

Driver door control ECU

Passenger door control ECU

Seat control ECUDoor condition signal (Driver side
door courtesy lamp signal, Pas-
senger side door courtesy signal)
BEAN

DID8Q±01
DI±1608
± DIAGNOSTICSCOMBINATION METER SYSTEM
1802 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. METER GAUGE AND WARNING/INDICATOR
GAUGE:
ItemDetail
SpeedometerVehicle speed sensor (Direct line).
TachometerECM transmits engine speed to the meter to display.
ODO/TRIP MeterCombination meter assy.
FuelDisplays a fuel level according to a signal from the fuel sender gauge (Direct line).
Water TemperatureDisplays engine coolant temperature according to a signal from the ECM (BEAN).
Oil PressureReceives a signal from the oil pressure sender (Direct line).
Volt MeterDisplays vehicle voltage according to a voltage from the IG terminal (Direct line).
WARNING/INDICATOR:
HINT:
Combination meter bulb check is performed for 3 seconds after the ignition switch is turned ON.
ItemDetailList of indicators available for
bulb check
O/D OFFReceives a signal from the ECM (Direct line)±
TURNTurns signal switch ON (Direct line)±
BEAMReceives a signal from the body ECU (*1), Displays a signal received from the
dimmer switch (*2) (Direct line)±
SECURITYReceives a set signal from the transponder key ECU and body ECU (Direct line)±
CHARGEReceives a malfunction signal from the alternator (Direct line)
AIR BAGReceives a malfunction signal from the airbag sensor center (Direct line)
D SEAT BELTReceives the driver seat belt signal (Unfastened) from the seat belt inner front LH
(Direct line)±
DOOROpen door indicator comes on when a signal is received from the ECU (BEAN)
from each door±
A/T OIL TEMP.Warning is displayed when the oil temperature is high (Direct line)
BRAKEComes on when the parking brake switch is on or the brake fluid level warning
switch is on (Direct line)
MIL (CHECK ENGINE)Receives a malfunction signal from the ECM (Direct line)
FUEL WARNINGReceives the fuel empty signal from the fuel sender gauge (Direct line)±
ABSReceives a malfunction signal from the skid control ECU (Direct line)
WASHERWarning is displayed when the washer level is low (Direct line)±
CRUISEReceives a CRUISE on signal or malfunction signal from the ECM (Direct line)±
VSC TRACReceives a malfunction signal from the skid control ECU (Direct line)
VSC (TRAC) OFFReceives a malfunction signal from the translate ECU (Direct line)
SLIPReceives a malfunction signal from the translate ECU (Direct line)
4HIReceives a 4HI signal from the 4WD control ECU (Direct line)±
CTR DIF LOCKReceives a DIF LOCK signal from the 4WD control ECU (Direct line)±
A/T PReceives a P signal from the park/neutral position switch (Direct line)±
A/T NReceives an N signal from the park/neutral position switch (Direct line)±
A/T DReceives a D signal from the park/neutral position switch (Direct line)±
A/T 3Receives a 3 signal from the park/neutral position switch (Direct line)±
A/T 2Receives a 2 signal from the park/neutral position switch (Direct line)±
A/T LReceives an L signal from the park/neutral position switch (Direct line)±

DID8S±01
/ /
/ /
COMBINATION METER SYSTEM Check Sheet
Inspector 's name:
Customer 's NameVIN
Production Date
Licence Plate No.
Date Vehicle
Brought InOdometer Readingkm
miles
Weather Conditions
When Problem
OccurredFrequency Problem Occurs
Weather
Outside temperature Constantly  Sometimes ( times per day, month)
 Once only Date Problem First Occurred
 Fine  Cloudy  Rainy  Snowy
 Various/Others
 Hot  Warm  Cool
 Cold (Approx. 5F ( 5C))
Problem Symptom
Gauge

Malfunction in speedometer

Malfunction in tachometer

Malfunction in engine coolant temperature receiver gauge

Malfunction in fuel receiver gauge

Entire combination meter does not operate

Buzzer does not sound (Key reminder warning, Seat belt warning)

Seat belt warning for driver's seat does not operate
Others

Operating light control rheostat does not change light brightness

















Malfunction in oil pressure receiver gauge

Malfunction in volt meter DI±1612
± DIAGNOSTICSCOMBINATION METER SYSTEM
1806 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

DID8U±01
DI±1614
± DIAGNOSTICSCOMBINATION METER SYSTEM
1808 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
HINT:
Inspect the related ºFuseº and ºRelayº before confirming the suspected area as shown in the table below.
MALFUNCTION SYSTEM:
SymptomSuspected AreaSee page
Entire combination meter does not operate.Refer to troubleshooting proceduresDI±1628
Operating light control rheostat does not change light brightness.Refer to troubleshooting proceduresDI±1645
Seat belt warning does not operate.Refer to troubleshooting proceduresDI±1650
Key reminder warning buzzer does not sound.
1. Multiplex communication system
2. Key unlock warning switch circuit
3. Door courtesy lamp switch circuit
4. Combination meter assyDI±1892
DI±1715
DI±1728
IN±35
METER GAUGES:
SymptomSuspected AreaSee page
Malfunction in speedometerRefer to troubleshooting proceduresDI±1632
Malfunction in tachometerRefer to troubleshooting proceduresDI±1636
Malfunction in fuel receiver gaugeRefer to troubleshooting proceduresDI±1640
Malfunction in engine coolant temperature receiver gaugeRefer to troubleshooting proceduresDI±1644
Malfunction in oil pressure receiver gaugeRefer to troubleshooting proceduresDI±1654
Malfunction in volt meterRefer to troubleshooting proceduresDI±1658
WARNING LIGHTS:
SymptomSuspected AreaSee page
Check engine warning light (MIL) does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Discharge warning light does not come on.
1. ECM
2. Wire harness or connector
3. Combination meter assyDI±9
±
IN±35
Brake warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
ABS warning light does not come on.
1. Skid control ECU
2. Wire harness or connector
3. Combination meter assyDI±895
±
IN±35
SRS warning light does not come on.
1. Airbag sensor assy
2. Wire harness or connector
3. Combination meter assyDI±1126
±
IN±35
Open door warning light does not come on.
1. Door courtesy light switch circuit
2. Wire harness or connector
3. Combination meter assy
4. Body ECUDI±1728
±
IN±35
IN±35
Fuel level warning light does not come on.
1. Refer to troubleshooting
2. Wire harness or connector
3. Combination meter assyDI±1640
±
IN±35
Low oil pressure warning light does not come on.
1. Low oil pressure warning switch
2. Wire harness or connector
3. Combination meter assyBE±55
±
IN±35

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1617
1811 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Reconnect the C5 and C6 connectors.
(d) Measure the voltage of each terminal of the wire harness side connector.
Standard:
Terminals No.Wiring ColorTerminal DescriptionConditionSpecified Condition
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light ON6.7 to 12 V
C5±1 ± Body groundR±B ± Body
groundParking brake signalParking brake warning light OFFBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light ONBelow 1 V
C5±2 ± Body groundLG±R ± Body
groundCRUISE signalCRUISE indicator light OFF10 to 14 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch OFFBelow 1 V
C5±3 ± Body groundB ± Body groundIgnition switch signal
(Start)Ignition switch START10 to 14 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light ONBelow 1 V
C5±4 ± Body groundG±Y ± Body
groundSeat belt condition signal
(Driver side)D±BELT indicator light OFF10 to 14 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light ONBelow 1 V
C5±13 ± Body groundLG±R ± Body
groundWasher level signalWASH LVL indicator light OFF10 to 14 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light ONBelow 1 V
C5±14 ± Body groundL±O ± Body
groundO/D OFF indicator signalO/D OFF indicator light OFF10 to 14 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light ONBelow 1 V
C5±15 (*1) ± Body groundY±R ± Body
groundA/T oil temperature signalA/T OIL TEMP. warning light OFF10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light ON10 to 14 V
C5±16 ± Body groundLG±B ± Body
groundSecurity indicator light
signal (Engine immobilizer
system)
Security indicator light OFFBelow 1 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light ON10 to 14 V
C5±17 ± Body groundGR ± Body
groundSecurity indicator light
signal (Theft deterrent
system)
Security indicator light OFFBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light ONBelow 1 V
C5±18 ± Body groundV±W ± Body
groundCHECK ENGINE signalCHECK ENGINE warning light OFF10 to 14 V
C5±19 ± Body groundG±B ± Body
groundA/T shift position signal
(L)A/T L indicator OFFBelow 1 V

DI±1618
± DIAGNOSTICSCOMBINATION METER SYSTEM
1812 Author: Date:
2005 SEQUOIA (RM1146U) C5±19 ± Body ground
G±B ± Body
groundA/T shift position signal
(L)A/T L indicator ON10 to 14 V
C5±20 ± Body groundGR±L ± Body
groundTire pressure signalTire pressure warning light ON6.7 to 12 V
C5±20 ± Body groundGR±L ± Body
groundTire pressure signalTire pressure warning light OFFBelow 1 V
C5±21 ± Body groundR ± Body groundInjector signalIgnition switch ONPulse generation
C5±22 ± Body groundW±G ± Body
groundIllumination signalLight control switch OFFBelow 1 V
C5±22 ± Body groundW±G ± Body
groundIllumination signalLight control switch ON10 to 14 V
C5±23 ± Body groundY±G ± Body
groundTachometer signalEngine runningPulse generation
(see waveform 1)
C5±24 ± Body groundY ± Body groundSpeed signal (Input)Ignition switch ON and turn the
wheel slowly10 to 14 V e
Below 1 V
C5±25 ± Body groundG±O ± Body
groundSpeed signal (Output)Ignition switch ON and turn the
wheel slowlyPulse generation
(see waveform 2)
C5±26 ± Body groundV ± Body groundPower source for fuel
sender gaugeIgnition switch ON, fuel level is
FULLBelow 1 V
C5±26 ± Body groundV ± Body groundPower source for fuel
sender gaugeIgnition switch ON, fuel level is
EMPTY4 to 7 V
C5±27 ± Body groundL±B ± Body
groundOil pressure signalOil pressure warning light ONBelow 1 V
C5±27 ± Body groundL±B ± Body
groundOil pressure signalOil pressure warning light OFF10 to 14 V
C5±28 ± Body groundB±R ± Body
groundInjector power signalIgnition switch ON10 to 14 V
C5±29 ± Body groundB±Y ± Body
groundSRS warning light signalSRS warning light ONBelow 1 V
C5±29 ± Body groundB±Y ± Body
groundSRS warning light signalSRS warning light OFF8 to 14 V
C5±33 ± Body groundG±Y ± Body
groundTurn signal (R)Ignition switch ON, turn signal RH
indicator OFFBelow 1 V
C5±33 ± Body groundG±Y ± Body
groundTurn signal (R)Ignition switch ON, turn signal RH
indicator ON10 to 14 V
C5±34 ± Body groundL±Y ± Body
groundA/T shift position signal
(P)A/T P indicator OFFBelow 1 V
C5±34 ± Body groundL±Y ± Body
groundA/T shift position signal
(P)A/T P indicator ON10 to 14 V
C5±35 ± Body groundB±Y ± Body
groundA/T shift position signal
(R)A/T R indicator OFFBelow 1 V
C5±35 ± Body groundB±Y ± Body
groundA/T shift position signal
(R)A/T R indicator ON10 to 14 V
C5±36 ± Body groundG±R ± Body
groundA/T shift position signal
(N)A/T N indicator OFFBelow 1 V
C5±36 ± Body groundG±R ± Body
groundA/T shift position signal
(N)A/T N indicator ON10 to 14 V
C5±37 ± Body groundW±R ± Body
groundA/T shift position signal
(D)A/T D indicator OFFBelow 1 V

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1619
1813 Author: Date:
2005 SEQUOIA (RM1146U) C5±37 ± Body ground
W±R ± Body
groundA/T shift position signal
(D)A/T D indicator ON10 to 14 V
C5±38 ± Body groundL ± Body groundA/T shift position signal
(3)A/T 3 indicator OFFBelow 1 V
C5±38 ± Body groundL ± Body groundA/T shift position signal
(3)A/T 3 indicator ON10 to 14 V
C5±39 ± Body groundLG ± Body
groundA/T shift position signal
(2)A/T 2 indicator OFFBelow 1 V
C5±39 ± Body groundLG ± Body
groundA/T shift position signal
(2)A/T 2 indicator ON10 to 14 V
C5±40 ± Body groundB±R ± Body
groundRSCA OFF signalRSCA OFF indicator light OFFBelow 1 V
C5±40 ± Body groundB±R ± Body
groundRSCA OFF signalRSCA OFF indicator light ON8 to 14 V
C6±1 ± Body groundW±R ± Body
groundSLIP signalSLIP indicator light ONBelow 1 V
C6±1 ± Body groundW±R ± Body
groundSLIP signalSLIP indicator light OFF10 to 14 V
C6±2 ± Body groundR±G ± Body
groundVSC OFF signal (*1)
TRAC OFF signal (*5)VSC OFF indicator light ON (*1)
TRAC OFF indicator light ON (*5)Below 1 V
C6±2 ± Body groundR±G ± Body
groundVSC OFF signal (*1)
TRAC OFF signal (*5)VSC OFF indicator light OFF (*1)
TRAC OFF indicator light OFF (*5)10 to 14 V
C6±3 ± Body groundP±L ± Body
groundTRAC signalVSC/TRAC indicator light ONBelow 1 V
C6±3 ± Body groundP±L ± Body
groundTRAC signalVSC/TRAC indicator light OFF10 to 14 V
C6±4 ± Body groundBR±Y ± Body
groundCTR DIFF LOCK signalCTR DIFF LOCK indicator light ONBelow 1 V
C6±4 ± Body groundBR±Y ± Body
groundCTR DIFF LOCK signalCTR DIFF LOCK indicator light OFF10 to 14 V
C6±5 ± Body groundY±B ± Body
ground4HI signal4HI indicator ONBelow 1 V
C6±5 ± Body groundY±B ± Body
ground4HI signal4HI indicator OFF10 to 14 V
C6±6 ± Body groundG±W ± Body
ground4LO signal4LO indicator ONBelow 1 V
C6±6 ± Body groundG±W ± Body
ground4LO signal4LO indicator OFF10 to 14 V
C6±8 ± Body groundY ± Body groundCharge signalEngine runningBelow 1 V
C6±8 ± Body groundY ± Body groundCharge signalEngine stopped10 to 14 V
C6±10 ± Body groundY±R ± Body
groundGround (Speed)AlwaysBelow 1 V
C6±11 ± Body groundY±B ± Body
groundGround (Fuel sender
gauge)AlwaysBelow 1 V
C6±12 ± Body groundBR ± Body
groundGroundAlwaysBelow 1 V
C6±13 ± Body groundLG ± Body
groundHeight control indicator
lamp signal (MAN.)Height control indicator lamp MAN.
Indicator light ONBelow 1 V
C6±13 ± Body groundLG ± Body
groundHeight control indicator
lamp signal (MAN.)Height control indicator lamp MAN.
Indicator light OFF10 to 14 V

I28567
GND DI±1620
± DIAGNOSTICSCOMBINATION METER SYSTEM
1814 Author: Date:
2005 SEQUOIA (RM1146U) C6±14 ± Body ground
P ± Body groundHeight control indicator
lamp signal (LO)Height control indicator lamp LO,
Indicator light ONBelow 1 V
C6±14 ± Body groundP ± Body groundHeight control indicator
lamp signal (LO)Height control indicator lamp LO,
Indicator light OFF10 to 14 V
C6±15 ± Body groundB±L ± Body
groundHeight control indicator
lamp signal (N)Height control indicator lamp N, In-
dicator light ONBelow 1 V
C6±15 ± Body groundB±L ± Body
groundHeight control indicator
lamp signal (N)Height control indicator lamp N, In-
dicator light OFF10 to 14 V
C6±16 ± Body groundGR±R ± Body
groundHeight control indicator
lamp signal (HI)Height control indicator lamp HI, In-
dicator light ONBelow 1 V
C6±16 ± Body groundGR±R ± Body
groundHeight control indicator
lamp signal (HI)Height control indicator lamp HI, In-
dicator light OFF10 to 14 V
C6±17 (*3) ± Body groundR±G ± Body
groundHi±Beam signalHi±Beam OFFBelow 1 V
C6±17 (*3) ± Body groundR±G ± Body
groundHi±Beam signalHi±Beam ON10 to 14 V
C6±18 (*4) ± Body groundGR±L ± Body
groundHi±Beam signalHi±Beam OFFBelow 1 V
C6±18 (*4) ± Body groundGR±L ± Body
groundHi±Beam signalHi±Beam ON10 to 14 V
C6±19 ± Body groundG±B ± Body
groundTurn signal (L)Ignition switch ON, turn signal LH
indicator OFFBelow 1 V
C6±19 ± Body groundG±B ± Body
groundTurn signal (L)Ignition switch ON, turn signal LH
indicator ON10 to 14 V
C6±21 ± Body groundR±W ± Body
groundABS signalABS warning light ON6.7 to 12 V
C6±21 ± Body groundR±W ± Body
groundABS signalABS warning light OFFBelow 1 V
C6±23 ± Body groundW±R ± Body
groundBatteryAlways10 to 14 V
C6±24 ± Body groundB±O ± Body
groundIgnition switch signal (ON)Ignition switch OFFBelow 1 V
C6±24 ± Body groundB±O ± Body
groundIgnition switch signal (ON)Ignition switch ON10 to 14 V
*1: 4WD
*2: w/ Driving position memory
*3: w/o Daytime running light
*4: w/ Daytime running light
*5: 2WD
Waveform 1 (Reference):
ConditionGauge set
Engine idle speed5 V/DIV, 10 ms/DIV

I27708
C5±31
C5±32
(*1) C5±30
C5±25
C5±24
C6±10
C5±23
C5±28
C5±21
C5±4
C5±29
C5±26
C6±11
C6±12
C5±22 C5±27
CPU
Supply CircuitC5±6
C5±5
C6±23
HEAD (*2)
OIL MAINT
DOOR
ILL
AIRBAG
D±BELT
FUEL WARNIG
C5±3
HI
N
LO
MAN.
BRAKE C6±16
C6±15
C6±14
C6±13
C5±1
*1: w/ Driving Position Memory *2: USA *3: Canada
TAIL (*3)
ONE STEP
DIMMER Buzzer
LCD
Speedometer
Tachometer
Fuel Gauge
Engine Coolant Temperature
Receiver Gauge
Oil Pressure Gauge
Volt Gauge DI±1622
± DIAGNOSTICSCOMBINATION METER SYSTEM
1816 Author: Date:
2005 SEQUOIA (RM1146U)
COMBINATION METER INNER CIRCUIT

DID8X±01
DI±1626
± DIAGNOSTICSCOMBINATION METER SYSTEM
1820 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
DATA LIST
According to the DATA LIST displayed by the hand±held tester, you can read the values of the switches,
sensors, actuators and so on without part removal. Reading the DATA LIST as the first step of troubleshoot-
ing is one method to shorten labor time.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand±held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Operate the hand±held tester according to the steps on the display and select ºDATA LISTº.
METER:
ItemMeasurement Item /
Range (Display)Normal ConditionDiagnostic Note
SPEED METER
Vehicle Speed Meter /
Min.: 0 km/h (0 mph)
Max.: 255 km/h (158 mph)Almost the same as actual vehicle
speed (When driving)
TACHO METEREngine RPM /
Min.: 0 rpm Max.: 12,750 rpmAlmost the same as actual engine
speed (When engine is running)
FUEL GAUGEFuel Input /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the fuel receiver gauge
angle.

LIGHT RHEOSTATLight Control Rheostat /
Min.: 0 Max.: 255Light control rheostat switch is
Dark (0) " Bright (255)
OIL GAUGEOil Gauge /
Min.: 0 Max.: 255Tester indication changes accord-
ing to the oil pressure receiver
gauge angle.

ODO/TRIP SWODO / TRIP
ODO/TRIP switch / ON/OFFON: Switch is pushed
OFF: Switch is released