TOYOTA SEQUOIA 2001 Service Repair Manual

RS0BV±08
RS±120
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTOR
3403 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION
HINT:
The SRS wire harness is integrated with the cowl wire harness assembly. The wires for the SRS wire harness
are encased in a yellow corrugated tube and all the connectors in the system except the seat position airbag
sensor connector and occupant classification ECU connectors, colored are yellow.
1. VEHICLE NOT INVOLVED IN COLLISION
Perform a diagnostic system check (see page DI±1147).
2. VEHICLE INVOLVED IN COLLISION
(a) Perform a diagnostic system check (see page DI±1147).
(b) Check breaks in all wires of the SRS wire harness, and exposed conductors.
(c) Check if the SRS wire harness connectors are cracked or chipped.

RS0BW±07
± SUPPLEMENTAL RESTRAINT SYSTEMWIRE HARNESS AND CONNECTOR
RS±121
3404 Author: Date:
2005 SEQUOIA (RM1146U)
REPLACEMENT
REPLACEMENT REQUIREMENTS
In the following cases, replace the wire harness or connector with a new one.

Any part of the SRS wire harness or any connector has been found to be faulty in troubleshoot-
ing.

Any part of the SRS wire harness or any connector has been found to be faulty while checking
items (see page RS±120).
CAUTION:
If the wire harness used in the SRS is damaged, replace the whole SRS wire harness assembly.

BE01E±12
± BODY ELECTRICALBODY ELECTRICAL SYSTEM
BE±1
3405 Author: Date:
2005 SEQUOIA (RM1146U)
BODY ELECTRICAL SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77
Take care to observe the following precautions when performing inspections or removal and replacement
of body electrical related parts.
1. LIGHTING SYSTEM
Halogen bulbs have pressurized gas inside and require special handling.
They may burst or shatter if scratched or the bulb is dropped. Hold a bulb only by its plastic or metal case.
Don't touch the glass part of a bulb with bare hands.
2. SRS (SUPPLEMENTAL RESTRAINT SYSTEM)
The SEQUOIA is equipped with an SRS (Supplemental Restraint System) such as the driver airbag. Failure
to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during
servicing, possibly leading to a serious accident. Before servicing (including removal and installation of parts,
inspection or replacement), be sure to read the precautions in the RS section (See page xx±xxx).
3. AUDIO SYSTEM
If the battery negative (±) terminal is disconnected, the preset AM, FM 1 and FM 2 stations stored in the
memory are erased, so be sure to make a memo of the stations and reset them after the battery terminal
is reconnected.
4. MOBILE COMMUNICATION SYSTEM
If the vehicle is equipped with a mobile communication system, refer to precautions in the IN section.

BE19B±08
BE±2
± BODY ELECTRICALTROUBLESHOOTING
3406 Author: Date:
2005 SEQUOIA (RM1146U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
POWER OUTLET
SymptomSuspect AreaSee page
Electric power source cannot be out of the power outlet.
1. PWR OUTLET Fuse
2. INVERTER Relay
3. Main Switch
4. Voltage Inverter
5. Wire HarnessBE±14
BE±20
BE±20
BE±20
±
IPO system does not operate.
Power source cannot be supplied from the power outlet socket
when the ignition switch is off.1. PWR OUTLET Fuse
2. INVERTER Relay
3. Instrument panel J/B (IPO) circuit
4. Wire HarnessBE±14
BE±20
BE±20
±
IGNITION SWITCH
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Ignition switch is not set to each position.
1. Ignition Switch
2. Power Source Circuit (Body ECU)
3. Power Source Circuit (Driver door ECU)
4. Power Source Circuit (Passenger door ECU)BE±24
DI±1700
BE±34
DI±1849
KEY UNLOCK WARNING SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Key unlock warning system does not operate.
(The buzzer does not sound when the driver's door is opened with
the ignition OFF and key inserted)1. Key Unlock Warning Switch
2. Driver Door Courtesy Light Switch
3. Wire Harness
4. Combination MeterBE±24
BE±40
±
±
Key unlock warning system does not operate.
(The buzzer sounds when the ignition key is ACC or ON)1. Ignition Switch
2. Wire Harness
3. Combination MeterBE±24
±
±
w/o Daytime Running Light:
HEADLIGHT AND TAILLIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Only one headlight comes on.1. Bulb
2. Wire Harness±
±
ºLO±Beamº does not light (All).
1. HEAD Relay
2. Headlight Dimmer Switch
3. Wire Harness
4. Body ECUBE±27
BE±27
±
±
ºLO±Beamº does not light (One side).
1. Bulb
2. H±LP LH Fuse
3. H±LP RH Fuse
4. Wire Harness±
BE±14
BE±14
±

± BODY ELECTRICALTROUBLESHOOTING
BE±3
3407 Author: Date:
2005 SEQUOIA (RM1146U) ºHI±Beamº does not light (All).
1. HEAD Relay
2. Headlight Dimmer Switch
3. Wire Harness
4. Body ECUBE±27
BE±27
±
±
ºHI±Beamº does not light (One side).
1. Bulb
2. H±LP LH Fuse
3. H±LP RH Fuse
4. Wire Harness±
BE±14
BE±14
±
ºFlashº does not light.
1. H±LP LH Fuse
2. H±LP RH Fuse
3. Bulb
4. Headlight Dimmer Switch
5. Wire Harness
6. Body ECUBE±14
BE±14
±
BE±27
±
±
Headlight does not come on.
1. Bulb
2. HEAD Relay
3. Light Control Switch
4. Wire Harness
5. Body ECU±
BE±27
DI±1750
±
±
Headlight flickers.
1. Bulb
2. Wire Harness
3. Body ECU±
±
±
Headlight is dark.
1. Bulb
2. Body ECU
3. Wire Harness±
±
±
Only one taillight comes on.1. Bulb
2. Wire Harness±
±
Taillight does not come on.
(Headlight is normal)
1. TAIL Fuse
2. TAILLIGHT Relay
3. Light Control Switch
4. Wire Harness
5. Body ECUBE±14
BE±27
BE±27
±
±
Taillight does not come on.
(Headlight does not come on)
1. TAIL Fuse
2. TAILLIGHT Relay
3. Light Control Switch
4. Wire Harness
5. Body ECUBE±14
BE±27
BE±27
±
±
Rear combination light does not come on.
1. Bulb
2. TAIL Fuse
3. TAILLIGHT Relay
4. Wire Harness
5. Body ECU±
BE±14
BE±27
±
±
w/ Daytime Running Light:
HEADLIGHT AND TAILLIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Only one headlight comes on.1. Bulb
2. Wire Harness±
±

BE±4
± BODY ELECTRICALTROUBLESHOOTING
3408 Author: Date:
2005 SEQUOIA (RM1146U) ºLO±Beamº does not light (All).
1. HEAD Relay
2. DRL Fuse
3. DIMMER Relay
4. DRL No. 4 Relay
5. Wire Harness
6. Body ECUBE±27
BE±14
BE±27
BE±27
±
±
ºLO±Beamº does not light (One side).
1. Bulb
2. H±LP LL Fuse
3. H±LP LP Fuse
4. Wire Harness±
BE±14
BE±14
±
ºHI±Beamº does not light (All).
1. HEAD Relay
2. Headlight Dimmer Switch
3. DRL Fuse
4. DIMMER Relay
5. DRL No. 4 Relay
6. Wire Harness
7. Body ECUBE±27
BE±27
BE±14
BE±27
BE±27
±
±
ºHI±Beamº does not light (One side).
1. Bulb
2. H±LP LL Fuse
3. H±LP LP Fuse
4. Wire Harness±
BE±14
BE±14
±
ºFlashº does not light.
1. Headlight Dimmer Switch
2. Wire Harness
3. Body ECUBE±27
±
±
Headlight does not come on.
1. Bulb
2. HEAD Relay
3. DIMMER Relay
4. DRL No. 4 Relay
5. Headlight Dimmer Switch
6. Light Control Switch
7. Wire Harness
8. Body ECU±
BE±27
BE±27
BE±27
BE±27
BE±27
±
±
Headlight does not go off when light control switch is in OFF posi-
tion.
1. Power Source Circuit (Body ECU)
2. HEAD Relay
3. DIMMER Relay
4. Light Control Switch
5. Wire Harness
6. Body ECUDI±1700
BE±27
BE±27
BE±27
±
±
Headlight flickers.
1. Bulb
2. Wire Harness
3. Body ECU±
±
±
Headlight is dark.
1. Bulb
2. Wire Harness
3. Body ECU±
±
±
Taillight does not come on when light control switch is in TAIL
position.
1. TAIL Fuse
2. TAILLIGHT Relay
3. Light Control Switch
4. Wire Harness
5. Body ECUBE±14
BE±27
BE±27
±
±

± BODY ELECTRICALTROUBLESHOOTING
BE±5
3409 Author: Date:
2005 SEQUOIA (RM1146U) Taillight does not go off when light control switch is in OFF posi-
tion.
1. TAILLIGHT Relay
2. Light Control Switch
3. Wire Harness
4. Body ECUBE±27
BE±27
±
±
Headlight does not come on when engine is running and light
control switch is in OFF position .
1. ECU±B Fuse
2. MAIN Fuse
3. HEAD Relay
4. DRL Fuse
5. DRL No. 4 Relay
6. DIMMER Relay
7. Parking Brake Switch
8. Wire Harness
9. Body ECUBE±14
BE±14
BE±27
BE±14
BE±27
BE±55
BE±55
±
±
FOG LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Fog light does not come on with light control switch is in HEAD
position.
(Headlight is normal.)
1. FOG Fuse
2. FOG LIGHT Relay
3. Fog Light Switch
4. Wire Harness
5. Body ECUBE±14
BE±27
BE±34
±
±
Fog light does not come on with light control switch is in HEAD
position.
(Headlight does not light).1.*1 Other Parts
2. Wire Harness±
±
Only one light does not come on.1. Bulb
2. Wire Harness±
±
*1: Inspect Headlight System
TURN SIGNAL AND HAZARD WARNING SYSTEM
SymptomSuspect AreaSee page
ºHazardº and ºTurnº do not light up.
1. GAUGE Fuse
2. TURN±HAZ Fuse
3. Ignition Switch
4. Turn Signal Flasher Relay
5. Wire HarnessBE±14
BE±14
BE±24
BE±24
±
Hazard warning light does not light up.
(Turn is normal)1. Hazard Warning Switch
2. Wire Harness
3. Turn Signal Flasher RelayBE±36
±
BE±36
Turn signal does not light up.
(Hazard is normal)1. Turn Signal Switch
2. Wire Harness
3. Turn Signal Flasher RelayBE±36
±
BE±36
Turn signal does not light up in one direction.1. Bulb
2. Wire Harness±
±
Only one bulb does not light up.1. Bulb
2. Wire Harness±
±
INTERIOR LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the interior lights do not come on.
1. DOME Fuse
2. Illumination Circuit
3. Body ECUBE±14
DI±1759
±

BE±6
± BODY ELECTRICALTROUBLESHOOTING
3410 Author: Date:
2005 SEQUOIA (RM1146U) The interior light does not come on when the driver's door is
opened.
1. Driver's Door Courtesy Light Switch
2. Wire Harness
3. Body ECUBE±40
±
±
The light does not come on when the passenger's door is opened.
1. Passenger's Door Courtesy Light Switch
2. Wire Harness
3. Body ECUBE±40
±
±
The light does not come on when the rear±right door is opened.
1. Rear±Right Door Courtesy Light Switch
2. Wire Harness
3. Body ECUBE±40
±
±
The light does not come on when the rear±left door is opened.
1. Rear±Left Door Courtesy Light Switch
2. Wire Harness
3. Body ECUBE±40
±
±
Only one of the bulbs comes on.Bulb±
The illumination does not fade out when all the doors are closed.1. Courtesy Light Switch
2. Body ECUBE±40
±
The illumination does not fade out immediately when all the doors
are locked within 15 seconds after they are closed.1. Door Unlock Detection Switch
2. Body ECUBE±79
±
Front personal light does not come on.
1. Bulb
2. Front Personal Light
3. Wire Harness±
BE±40
±
Room light does not come on.
1. Bulb
2. Room Light
3. Wire Harness±
BE±40
±
Vanity light does not come on.
1. Bulb
2. Vanity Light
3. Wire Harness±
BE±40
±
Luggage Room light does not come on.
1. Bulb
2. Back Door Courtesy Light Switch
3. Body ECU±
BE±40
±
Courtesy light does not come on.
1. Bulb
2. Door Courtesy Light Switch
3. Body ECU±
BE±40
±
Does not operate the illuminated entry1. Illumination Circuit
2. Body ECUDI±1759
±
All functions of the body control system do not operate.1. Power Source Circuit
2. Body ECUDI±1700
±
BACK±UP LIGHT SYSTEM
SymptomSuspect AreaSee page
Back±Up Light does not come on.
1. Bulb
2. GAUGE Fuse
3. BACK±UP LIGHT Relay
4. Instrument Panel J/B (IPO) Circuit
5. Ignition Switch
6. Wire Harness±
BE±14
BE±45
BE±20
BE±24
±
Back±Up Light always remains on.
1. Park/Neutral Position Switch
2. BACK±UP LIGHT Relay
3. Wire HarnessDI±576
BE±45
±
Only one light does not come on.1. Bulb
2. Wire Harness±
±

± BODY ELECTRICALTROUBLESHOOTING
BE±7
3411 Author: Date:
2005 SEQUOIA (RM1146U)
STOP LIGHT SYSTEM
SymptomSuspect AreaSee page
Stop light does not come on.
1. STOP Fuse
2. Stop Light Switch
3. Wire HarnessBE±14
BE±47
±
Stop light always come on.1. Stop Light Switch
2. Wire HarnessBE±47
±
Only one light does not come on.1. Bulb
2. Wire Harness±
±
WIPER AND WASHER SYSTEM
SymptomSuspect AreaSee page
Wipers and washer do not operate.
1. AM1 Fuse
2. Wiper Switch
3. Wire HarnessBE±14
BE±49
±
Wipers do not operate.
1. WIP Fuse
2. Wiper Switch
3. Wiper Motor
4. Wire HarnessBE±14
BE±49
BE±49
±
Washer motor does not operate.
1. WSH Fuse
2. Washer Switch
3. Washer Motor
4. Wire HarnessBE±14
BE±49
BE±49
±
Wipers do not operate when washer switch ON.
1. WSH Fuse
2. Washer Switch
3. Wiper Motor
4. Wire HarnessBE±14
BE±49
BE±49
±
Washer fluid is not injected.Washer Hose and Nozzle±

When wiper switch is in HI position, the wiper blade is in contact
with the body.

When the wiper switch is OFF, the wiper blade does not retract
or the retract position is wrong.
1. Wiper Motor *1
2. Wire harness *1BE±49
±
*1: Inspect wiper arm and blade set positions.
REAR WIPER AND WASHER SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Rear Wiper does not operate.
1. Rear Wiper and Washer Switch
2. Rear Wiper Motor
3. Back Door ECU
4. Body ECUBE±49
BE±49
±
±
Rear Washer does not operate.
1. Rear Wiper and Washer Switch
2. Rear Washer Motor
3. Back Door ECU
4. Body ECUBE±49
BE±49
±
±
COMBINATION METER
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
Combination meter system abnormal operation.See DIAGNOSIS SYSTEMDI±1610

BE±8
± BODY ELECTRICALTROUBLESHOOTING
3412 Author: Date:
2005 SEQUOIA (RM1146U)
DEFOGGER SYSTEM
SymptomSuspect AreaSee page
Rear window defogger does not operate.
1. HTR Fuse
2. DEFOG Fuse
3. DEFOG Relay
4. Defogger Switch (in A/C Panel Switch)
5. Defogger Wire
6. Wire HarnessBE±14
BE±14
BE±14
BE±65
BE±65
±
Mirror defogger does not operate.
1. MIR±HTR Fuse
2. HTR Fuse
3. Mirror Heater Relay
4. Mirror Heater
5. Wire HarnessBE±14
BE±14
BE±65
BE±65
±
POWER WINDOW CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the power windows do not operate.
(Power door lock system is normal.)
1. POWER MAIN Relay
2. Driver Door ECU (Power Window Master Switch)
3. Body ECU
4. Wire HarnessBE±69
DI±1788
±
±
Only the driver's window does not operate.
1. Power Window Motor
2. Power Window Pulse Sensor Circuit
3. Power Window Limit Switch Circuit
4. Driver Door ECU (Power Window Master Switch)BE±69
DI±1803
DI±1800
±
ºWindow lock functionº does not operate.Driver Door ECU (Power Window Master Switch)BE±69
Only the rear LH window does not operate.
1. Power Window Motor
2. Power Window Switch
3. Body ECUBE±69
BE±69
±
Only the rear RH window does not operate.
1. Power Window Motor
2. Power Window Switch
3. Body ECUBE±69
BE±69
±
Only the front passenger's window does not operate.
1. Power Window Motor
2. Power Window Pulse Sensor Circuit
3. Power Window Limit Switch Circuit
4. Passenger Door ECUBE±69
DI±1841
DI±1838
±
The Key related power window operations do not operate with
driver side door key cylinder.
(Master switch operation is normal.)1. Door Key Lock and Unlock Switch Circuit
2. Driver Door ECU (Power Window Master Switch)DI±1791
±
º Auto up º or º Auto down º does not operate. *1
1. Power Window Pulse Sensor Circuit
2. Power Window Limit Switch Circuit
3. Driver Door ECU (Power Window Master Switch)DI±1803
DI±1800
±
*1: º Auto up º or º Auto down º may not function when the manual switch is pressed and held for 2 sec. or
more with the window glass fully open or closed. In this case, by performing a sequence of the window glass
operations (full open, fully close and then half open), the function can be restored. If not, replace the driver
door ECU or passenger door ECU.