TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1609
1803 Author: Date:
2005 SEQUOIA (RM1146U)A/T R
Receives an R signal from the park/neutral position switch (Direct line)±
TAIL/HEADReceives a dimmer signal from the body ECU (BEAN)±
TIRE PRESSUREReceives a low tire pressure signal from the tire pressure monitor ECU (Direct line)
4LOReceives a 4LO signal from the 4WD control ECU (Direct line)±
MAIN REQD (Blinks)Blinks when 4,500 miles have been traveled, after ODO/TRIP switch is set (Direct
line)
MAIN REQD (Comes on)Blinks when 5,000 miles have been traveled, after ODO/TRIP switch is set (Direct
line)
RSCA OFFReceives an RSCA OFF signal from the airbag sensor center (Direct line)
HIReceives a suspension position HI signal from the suspension control ECU (Direct
line)
NReceives a suspension position N signal from the suspension control ECU (Direct
line)
LOReceives a suspension position LO signal from the suspension control ECU (Direct
line)
AHC MAN.Receives a suspension control manual signal from the suspension control ECU
(Direct line)
*1: w/ Day time running light
*2: w/o Day time running light
BUZZER:
ItemDetail
Key ReminderBuzzer is ON: Ignition switch is OFF, key is inserted, and door is open.
Fasten BeltBuzzer is ON: Ignition switch is ON and seat belt is unfastened.
2. COMBINATION METER IN SEQUOIA HAS THE FOLLOWING FEATURES:
(a) Built±in buzzer for the reminder system (key and seat belt)
(b) Integrated trip and odometer knobs

Press and release knob to scroll through trip ºAº, trip ºBº, and odometer features.

Press and hold the trip knob to reset trip meter functions.
(c) Oil maintenance indicator

When 4,500 miles have been traveled, after the ODO/TRIP switch is set, the maintenance indica-
tor begins to blink for 15 seconds after the ignition switch is turned to the ON position.

When 5,000 miles have been traveled, after the ODO/TRIP switch is set, the maintenance indica-
tor comes on.

Press and hold the trip knob to reset the oil maintenance indicator.
(d) Rotate knob to adjust interior illumination

DID8R±01
DI±1610
± DIAGNOSTICSCOMBINATION METER SYSTEM
1804 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
1 Vehicle Brought To Workshop
NEXT
2 Customer Problem Analysis (See page DI±1612)
NEXT
3 Check Multiplex Communication System (See page DI±1904)
Check if any DTCs are output.
HINT:
The combination meter of this system is connected to the multiplex communication system. Therefore, be-
fore starting troubleshooting, make sure to check that there is no trouble in the multiplex communication sys-
tem.
Multiplex Communication System DTC Is Out-
put (Proceed To ºMULTIPLEX COMMUNICA-
TION SYSTEMº (See page DI±1892))
No Multiplex Communication System DTC (Go
to step 4)
4 Problem Symptom Confirmation
Symptom Does Not Occur (Go to step 5)
Symptom Occurs (Go to step 6)
5 Symptom Simulation (See page DI±1892)
NEXT

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1611
1805 Author: Date:
2005 SEQUOIA (RM1146U)
6 Problem Symptoms Table (See page DI±1614)
NEXT
7 Circuit Inspection (See page DI±1628 to DI±1658)
NEXT
8 Identification of Problem
NEXT
9 Repair
NEXT
10 Confirmation Test
NEXT
End

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

DID8T±01
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1613
1807 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMIZE PARAMETERS
HINT:
The following can be customized.
NOTICE:

After confirming whether the items of the customer's request are applicable or not as custom-
ized items, perform customization.

Be sure to record the current value before customizing.

When troubleshooting, pay attention as there is a possibility that the function has been set to
SMALL through customizing (Example: In case of the symptom in which ºThe key reminder
buzzer operation does not functionº is displayed, check that the key reminder buzzer operation
is not set to SMALL, then perform troubleshooting).
METER:
DISPLAY (ITEM)DEFAULTCONTENTSSETTING
KEY REMND VOLUM
(Key reminder buzzer vol-
ume)
LARGEFunction that changes the volume of key reminder buzzer.LARGE/MEDIUM/SMALL

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±1615
1809 Author: Date:
2005 SEQUOIA (RM1146U) Seat belt warning lamp for driver's seat does not operate.
Refer to troubleshooting proceduresDI±1650
SLIP warning light does not come on.
1. SLIP warning light circuit
2. Wire harness and connector
3. Combination meter assy
4. Skid control ECUDI±1041
±
IN±35
IN±35
INDICATOR LIGHTS:
SymptomSuspected AreaSee page
Turn indicator light does not come on.
1. Turn signal flasher relay
2. Wire harness or connector
3. Combination meter assyBE±36
±
IN±35
High beam indicator light does not come on.
1. Headlight dimmer switch (*1)
Headlight dimmer switch circuit (*2)
2. Wire harness or connector
3. Combination meter assyBE±27
DI±1755
±
IN±35
Washer level indicator light does not come on.
1. Washer level warning switch
2. Wire harness or connector
3. Combination meter assyBE±49
±
IN±35
Tire pressure indicator light does not come on.
1. Tire pressure monitor ECU
2. Wire harness or connector
3. Combination meter assyDI±873
±
IN±35
CRUISE main indicator light does not come on.
1. CRUISE main indicator light circuit
2. Cruise main control switch circuit
3. Wire harness or connector
4. Combination meter assyDI±1557
DI±1561
±
IN±35
VSC OFF indicator light does not come on.1. VSC OFF indicator light circuit
2. Combination meter assyDI±1048
IN±35
VSC TRAC indicator light does not come on.1. VSC TRAC indicator light circuit
2. Combination meter assyDI±1027
IN±35
Security indicator light does not come on.1. Security indicator light circuit
2. Combination meter assyDI±1731
IN±35
4HI indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
4LO indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
CTR DIF LOCK indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
Height control indicator lamp does not come on.1. Height control indicator lamp circuit
2. Combination meter assyDI±785
IN±35
Height control manual indicator lamp does not come on.1. Height control manual indicator lamp circuit
2. Combination meter assyDI±789
IN±35
A/T indicator light does not come on.
1. Park/neutral position switch circuit
2. Wire harness and connector
3. Combination meter assyDI±576
±
IN±35
*1: w/o Day time running light
*2: w/ Day time running light
OTHERS:
SymptomSuspected AreaSee page
All buzzers (key reminder, seat belt) do not operate.Combination meter assyIN±35

DID8V±01
I27709
C5C6
DI±1616
± DIAGNOSTICSCOMBINATION METER SYSTEM
1810 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
COMBINATION METER ASSY
(a) Disconnect the C5 and C6 connectors.
(b) Measure the resistance of each terminal of the wire harness side connector.
Standard:
Terminals No.Wiring ColorTerminal DescriptionConditionSpecified Condition
C5±5 ± Body groundL±W ± Body
groundCompass and garage
door openerAlwaysBelow 1 W
C5±6 ± Body groundL±R ± Body
groundCompass and garage
door opener communica-
tion line
AlwaysBelow 1 W
C5±30 (*2) ± Body groundW ± Body groundMultiplex communication
signalAlwaysBelow 1 W
C5±31 ± Body groundLG±R ± Body
groundMultiplex communication
signalAlwaysBelow 1 W
C5±32 ± Body groundLG±B ± Body
groundMultiplex communication
signalAlwaysBelow 1 W

± 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