2001 TOYOTA SEQUOIA relay

DID8P±01
I28566
Seat Position
Control ECU
A/C ECU (Integration
Control Panel) BEANBody ECU
Back Door ECU
ECM
Light Control
Rheostat
Vehicle Speed
Sensor
Oil Pressure
Sender Gauge
Fuel Sender Gauge
Seat Inner
Belt Switch
Park/neutral
Position Switch
Turn Signal
Flasher Relay
Washer Level SensorKey Unlock
Warning Switch
Door Courtesy
Lamp Switch
Parking Brake Switch
Transponder
Key ECU
4WD Control ECU
Airbag Sensor
Center ECU Combination
Meter
Skid Control ECU
Suspension
Control ECU
Translate ECU
Overhead Module
(Garage Door
Opener)BEAN
BEAN
BEAN
BEAN
BEAN BEAN
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1605
1799 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

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

Wire harness side
1
2
3
4
5
6
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
401
2
3
4
5
8 6
10
11
12
13
14
15
16
17
18
19
21
23
24
Terminal No.
Translate ECU
ECM
STA Fuse
Front Seat Inner Belt LH (Buckle Switch)
Overhead Module (Garage Door Opener)
Overhead Module (Garage Door Opener)
Washer Level Sensor
ECM
ECM (*1)
Transponder Key Computer
Body ECU
ECM
ECM
Tire Pressure Monitor ECU
Injector No. 1
Light Control Rheostat
ECM
Speed Sensor
4P OUT (Other Parts)
Fuel Sender Gauge
Oil Pressure Sender Gauge
IGN Fuse
Airbag Sensor Assembly
Memory Seat ECU and SW (*2)
Back Door ECU
Integration Control and Panel
Turn Signal Flasher Relay
Park/Neutral Position Switch
Airbag Sensor AssemblyTranslate ECU
Translate ECU
Skid Control ECU
4WD Control ECU
Alternator
Speed Sensor
Fuel Sender Gauge
Ground
Suspension Control ECU
Body ECU (*4)
Body ECU (*3)
Turn Signal Flasher Relay
Skid Control ECU
ECU±B Fuse
IGN1 Fuse Connectors:
Terminal No.
Wire harness side
C5
C64WD Control ECU
4WD Control ECU
Suspension Control ECU
Suspension Control ECU
Suspension Control ECU
*1: 4WD
*2: w/ Driving Position Memory
*3: w/ Daytime Running Light
*4: w/o Daytime Running LightPark/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch
Park/Neutral Position Switch DI±1624
± DIAGNOSTICSCOMBINATION METER SYSTEM
1818 Author: Date:
2005 SEQUOIA (RM1146U)

DID4Z±01
DI±1666
± DIAGNOSTICSSLIDING ROOF SYSTEM
1860 Author: Date:
2005 SEQUOIA (RM1146U)
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
According to the DATA LIST displayed by the hand±held tester, you can read the value of the switch, sensor,
actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one
of the method to shorten the labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on tester, read the ºDATA LISTº.
SLIDE ROOF:
ItemMeasurement Item/
Display (Range)Normal conditionDiagnostic Note
LIMIT SW 1Position SW NO.1/
ON or OFFON: 250 mm point from fully opened position
OFF: Sliding roof fully closed position±
LIMIT SW 2Position SW NO.2/
ON or OFFON: Sliding roof fully closed position
OFF: Sliding roof except fully closed position±
OPEN SWSliding roof open SW
signal/ON or OFFON: Sliding roof is open
OFF: Sliding roof is close±
CLOSE SWSliding roof close SW
signal/ON or OFFON: Sliding roof is close
OFF: Sliding roof is open±
UP SWSliding roof up SW sig-
nal/ON or OFFON: Sliding roof is up
OFF: Sliding roof is down±
DOWN SWSliding roof down SW
signal/ON or OFFON: Sliding roof is down
OFF: Sliding roof is up±
IG (DIRCT)Ignition SW (Direct
signal)/ON or OFFON: Ignition switch to on
OFF: Ignition switch to off±
IG (MPX)Ignition SW (MPX)/ON
or OFFON: Ignition switch to on
OFF: Ignition switch to off±
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the meth-
od to shorten the labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on tester, perform the ºACTIVE TESTº.
SLIDE ROOF:
ItemTest DetailsDiagnostic Note
SLIDE ROOFSliding roof CLOS/UP ± OPN/DWNDuring this ACTIVE TEST, jam protection caught
detection can be monitored.

DI1OH±18
DI±1686
± DIAGNOSTICSBODY CONTROL SYSTEM
1880 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
DOOR LOCK CONTROL
SymptomSuspected AreaSee page
Lock or unlock cannot be operated with door lock control switch.
1. Door lock control switch (Power source circuit)
(Driver's)
(Passenger's)
2. Body ECU
DI±1788
DI±1826
IN±35
Door key linked function does not operate.
1. Door key lock and unlock switch circuit (Driver's)
(Passenger's)
2. Body ECUDI±1794
DI±1832
IN±35
Key confinement prevention function does not operate.1. Key unlock warning switch circuit
2. Body ECUDI±1715
IN±35
Door lock function does not operate.1. Door lock motor circuit
2. Body ECUDI±1720
IN±35
THEFT DETERRENT SYSTEM
SymptomSuspected AreaSee page
No alerting condition is operated. (The system cannot be set.)
1. Security indicator circuit
2. Key unlock warning switch circuit
3. Courtesy light switch circuit
4. Door unlock detection switch circuit (Driver's)
(Passenger's)
5. Engine hood courtesy light switch circuit
6. Back door courtesy light switch circuit
7. Back door ECU
8. Body ECUDI±1731
DI±1715
DI±1728
DI±1791
DI±1829
DI±1725
DI±1864
IN±35
IN±35
Cannot be canceled when IG is turned ON with a key.
1. Key unlock warning switch circuit
2. Ignition switch
3. Body ECUDI±1715
BE±24
IN±35
Cannot be canceled when unlocking the back door with a key.1. Back door ECU
2. Body ECUIN±35
IN±35
Headlights do not light up as an alert function.1. Headlight relay circuit
2. Body ECUDI±1708
IN±35
Taillights do not light up as an alert function.1. Taillight relay circuit
2. Body ECUDI±1706
IN±35
Theft deterrent horn or vehicle horn does not sound.
1. Security horn circuit
2. Horn circuit
3. Body ECUDI±1734
DI±1764
IN±35
During warning condition, cannot be canceled by unlocking the
door with a key.1. Door key lock and unlock switch circuit (Driver's)
(Passenger's)
2. Body ECUDI±1794
DI±1832
IN±35
During warning condition, cannot be canceled by unlocking the
door with a key. (transmitter)1. Transmitter
2. Body ECUBE±99
IN±35
During warning condition, cannot be canceled by turning the igni-
tion ON with a key.1. Ignition switch
2. Key unlock warning switch circuit
3. Body ECUBE±24
DI±1715
IN±35
The system operated for more than 60 seconds.Body ECUIN±35
Glass breakage sensor does not operate.1. Glass breakage sensor circuit
2. Body ECUDI±1774
IN±35

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1687
1881 Author: Date:
2005 SEQUOIA (RM1146U)
WIRELESS DOOR LOCK CONTROL
SymptomSuspected AreaSee page
All functions of wireless door lock control system do not operate.
1. Transmitter
2. Wireless door lock receiver circuit
3. Key unlock warning switch circuit
4. Body ECUBE±99
DI±1737
DI±1715
IN±35
Lock (or unlock) function does not operate.
1. Door unlock detection switch circuit (Driver's)
(Passenger's)
(Rear Door)
(Back Door)
2. Any door ECU
3. Body ECUDI±1791
DI±1829
DI±1723
DI±1869
IN±35
IN±35
Automatic lock function operates even if any door is opened within
30 seconds after all doors are unlocked by wireless door lock
control system.1. Door courtesy light switch circuit
2. Any door ECU
3. Body ECUDI±1728
IN±35
IN±35
Wireless door lock function operates, but the buzzer does not
sound.1. Wireless door lock buzzer circuit
2. Body ECUDI±1741
IN±35
Buzzer sounds, but wireless door lock function does not operate.Body ECUIN±35
REAR WIPER AND WASHER
SymptomSuspected AreaSee page
Rear wiper does not operate.1. Rear wiper switch and motor circuit
2. Body ECUDI±1704
IN±35
Rear washer does not operate.1. Rear washer switch and motor circuit
2. Body ECUDI±1704
IN±35
LIGHT CONTROL
SymptomSuspected AreaSee page
Automatic light control does not operate.
1. Automatic light control sensor circuit
2. Light control switch circuit
3. Body ECUDI±1753
DI±1750
IN±35
Auto turn±off does not operate.
1. Door courtesy light switch circuit (Driver side)
2. Ignition switch
3. Driver door ECU
4. Body ECUDI±1728
BE±24
IN±35
IN±35
Daytime running light function does not operate.
1. Daytime running light relay circuit
2. Parking brake switch circuit
3. Body ECUDI±1712
DI±1744
IN±35
FOG LIGHT
SymptomSuspected AreaSee page
Fog lights do not come on.
1. Bulb
2. FOG fuse
3. Fog light relay and switch circuit
4. Body ECU±
BE±14
DI±1710
IN±35
OTHERS
SymptomSuspected AreaSee page
Illuminated entry function does not operate.1. Illumination circuit
2. Body ECUDI±1759
IN±35
All functions of the body control system do not operate.1. Power source circuit
2. Body ECUDI±1700
IN±35
Remote control mirror does not operate.
(w/ Driving position memory)1. Remote control mirror switch circuit
2. Driving position memory switch circuit
3. Body ECUDI±1767
DI±1772
IN±35

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1689
1883 Author: Date:
2005 SEQUOIA (RM1146U) PCTY ± GND1
(B5±22 ± B6±6)
LG±B ± W±BCourtesy light switch
(Front RH)Passenger door courtesy light
switch OFF (Closed)10 to 14 V
LSWL ± GND1
(B7±24 ± B6±6)P±L ± W±BDoor unlock detection
switch (Rear LH)Rear LH door unlock detection
switch ON (Unlocked)Below 1 V
LSWL ± GND1
(B7±24 ± B6±6)P±L ± W±BDoor unlock detection
switch (Rear LH)Rear LH door unlock detection
switch OFF (Locked)10 to 14 V
DCTY ± GND1
(B7±12 ± B6±6)GR±R ± W±BCourtesy light switch
(Front LH)Driver door courtesy light switch
ON (Open)Below 1 V
DCTY ± GND1
(B7±12 ± B6±6)GR±R ± W±BCourtesy light switch
(Front LH)Driver door courtesy light switch
OFF (Closed)10 to 14 V
LSWR ± GND1
(B5±21 ± B6±6)P±B ± W±BDoor unlock detection
switch (Rear RH)Rear RH door unlock detection
switch ON (Unlocked)Below 1 V
LSWR ± GND1
(B5±21 ± B6±6)P±B ± W±BDoor unlock detection
switch (Rear RH)Rear RH door unlock detection
switch OFF (Locked)10 to 14 V
HORN ± GND1
(B5±26 ± B6±6)B±Y ± W±BHorn switch signalHorn switch OFF10 to 14 V
HORN ± GND1
(B5±26 ± B6±6)B±Y ± W±BHorn switch signalHorn switch ONBelow 1 V
BDR ± GND1
(B6±2 ± B6±6)L±W ± W±BBatteryAlways10 to 14 V
GND1 ± Body ground
(B6±6 ± Body ground)W±B ± Body groundGroundAlwaysBelow 1 V
RWLS ± GND1
(B5±6 ± B6±6)Y±B ± W±BRear wiper switch sig-
nal (ON)Rear wiper switch ONBelow 1 V
RWLS ± GND1
(B5±6 ± B6±6)Y±B ± W±BRear wiper switch sig-
nal (ON)Rear wiper switch OFF or INT10 to 14 V
RWC1 ± GND1
(B5±7 ± B6±6)G±B ± W±BRear wiper switch sig-
nal (INT)Rear wiper switch INTBelow 1 V
RWC1 ± GND1
(B5±7 ± B6±6)G±B ± W±BRear wiper switch sig-
nal (INT)Rear wiper switch OFF10 to 14 V
ACTD ± GND1
(B7±2 ± B6±6)R±B ± W±BDoor lock motor (Front
LH)Power door lock not operating or
operating to UNLOCKBelow 1 V
ACTD ± GND1
(B7±2 ± B6±6)R±B ± W±BDoor lock motor (Front
LH)Power door lock not operating to
LOCK10 to 14 V
IND ± GND1
(B5±16 ± B6±6)GR ± W±BSecurity indicator lightSecurity indicator is offBelow 1 V
IND ± GND1
(B5±16 ± B6±6)GR ± W±BSecurity indicator lightSecurity indicator light is on10 to 14 V
SH ± GND1
(B7±1 ± B6±6)R±G ± W±BTheft deterrent horn
signalSecurity horn does not soundBelow 1 V
SH ± GND1
(B7±1 ± B6±6)R±G ± W±BTheft deterrent horn
signalSecurity horn sounds10 to 14 V
HRLY ± GND1
(B7±8 ± B6±6)LG±R ± W±BHEAD relay signalHEAD relay ONBelow 1 V
HRLY ± GND1
(B7±8 ± B6±6)LG±R ± W±BHEAD relay signalHEAD relay OFF10 to 14 V
TRLY ± GND1
(B7±11 ± B6±6)LG ± W±BTaillight relay signalTaillight relay ONBelow 1 V
TRLY ± GND1
(B7±11 ± B6±6)LG ± W±BTaillight relay signalTaillight relay OFF10 to 14 V