2001 TOYOTA SEQUOIA ECU

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

DI1OG±31
I27698
B5B6
B7 BODY CONTROL ECU:
DI±1688
± DIAGNOSTICSBODY CONTROL SYSTEM
1882 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
KSW ± GND1
(B5±13 ± B6±6)Y±G ± W±BKey unlock warning
switch signalKey unlock warning switch ON
(Key inserted)Below 1 V
KSW ± GND1
(B5±13 ± B6±6)Y±G ± W±BKey unlock warning
switch signalKey unlock warning switch OFF
(Key not inserted)10 to 14 V
KSW2 ± GND1
(B5±15 ± B6±6)Y±G ± W±B
Key unlock warning
switch signal (Immobi-
lizer)Key unlock warning switch ON
(Key inserted)Below 1 V
KSW2 ± GND1
(B5±15 ± B6±6)Y±G ± W±B
Key unlock warning
switch signal (Immobi-
lizer)Key unlock warning switch OFF
(Key not inserted)10 to 14 V
HR ± GND1
(B7±18 ± B6±6)W±R ± W±BHorn switch signalHorn switch ONBelow 1 V
HR ± GND1
(B7±18 ± B6±6)W±R ± W±BHorn switch signalHorn switch OFF10 to 14 V
BDN ± GND1
(B6±15 ± B6±6)P±L ± W±BBack door power win-
dow motor (DOWN)Back door power window switch
DOWN positionBelow 1 V
BDN ± GND1
(B6±15 ± B6±6)P±L ± W±BBack door power win-
dow motor (DOWN)Back door power window switch
OFF or UP position10 to 14 V
BUP ± GND1
(B6±14 ± B6±6)W ± W±BBack door power win-
dow motor (UP)Back door power window switch
UP positionBelow 1 V
BUP ± GND1
(B6±14 ± B6±6)W ± W±BBack door power win-
dow motor (UP)Back door power window switch
OFF or DOWN position10 to 14 V
ACC ± GND1
(B7±10 ± B6±6)GR ± W±BIgnition switch (ACC)Ignition switch OFFBelow 1 V
ACC ± GND1
(B7±10 ± B6±6)GR ± W±BIgnition switch (ACC)Ignition switch ACC or ON10 to 14 V
BECU ± GND1
(B6±5 ± B6±6)W±R ± W±BBatteryAlways10 to 14 V
RLCY ± GND1
(B7±7 ± B6±6)R±W ± W±BCourtesy light switch
(Rear LH)Rear LH door courtesy light
switch ON (Open)Below 1 V
RLCY ± GND1
(B7±7 ± B6±6)R±W ± W±BCourtesy light switch
(Rear LH)Rear LH door courtesy light
switch OFF (Closed)10 to 14 V
RRCY ± GND1
(B5±8 ± B6±6)R±W ± W±BCourtesy light switch
(Rear RH)Rear RH door courtesy light
switch ON (Open)Below 1 V
RRCY ± GND1
(B5±8 ± B6±6)R±W ± W±BCourtesy light switch
(Rear RH)Rear RH door courtesy light
switch OFF (Closed)10 to 14 V
PCTY ± GND1
(B5±22 ± B6±6)LG±B ± W±BCourtesy light switch
(Front RH)Passenger door courtesy light
switch ON (Open)Below 1 V

± 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

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1693
1887 Author: Date:
2005 SEQUOIA (RM1146U) DOP (*2) ± GND1
(B5±9 ± B6±6)
P ± W±BGlass breakage sensor
ECU communicationArmed stateBelow 1 V
DOP (*2) ± GND1
(B5±9 ± B6±6)P ± W±BGlass breakage sensor
ECU communicationAlarm sounds (on glass break-
age detection)Pulse generation
(See page DI±1774)
(*1): w/ Daytime Running Light
(*2): w/ Glass Breakage Sensor
(*3): w/ Automatic Light Control
(*4): w/ Driving Position Memory
(*5): w/ Sliding Roof

DID99±01
DI±1694
± DIAGNOSTICSBODY CONTROL SYSTEM
1888 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 values of the switches,
sensors, actuators and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting
is one of the methods to shorten labor time.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on the tester, read the ºDATA LISTº.
BODY ECU:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
KEY UNLK WRN SWKey unlock warning switch/ON or
OFFON: Key is in ignition key cylinder
OFF: No key is in ignition key cyl-
inder
±
ACC SWACC switch/ON or OFFON: Ignition switch ACC
OFF: Ignition switch OFF±
IG SWIG switch/ON or OFFON: Ignition switch ON
OFF: Ignition switch OFF±
PARKING BRAKE SWParking brake switch/ON or OFF
ON:
Parking brake pedal depressed
(ON)
OFF:
Parking brake released (OFF)
±
HOOD COURTSY SWHood courtesy switch/ON or OFF
ON: Engine hood OPEN
(Hood courtesy switch ON)
OFF: Engine hood CLOSED
(Hood courtesy switch OFF)
±
D DOR CTY SWDriver door courtesy light switch/
ON or OFFON: Driver door is opened
OFF: Driver door is closed±
P DOR CTY SWFront passenger door courtesy
light switch/ON or OFF
ON: Front passenger door is
opened
OFF: Front passenger door is
closed
±
Rr DOR CTY SWRear passenger door courtesy
light switch/ON or OFF
ON: Rear passenger door is
opened
OFF: Rear passenger door is
closed
±
MIRR SEL SW RRemote control mirror switch pas-
senger side/ON or OFF
ON: Remote control mirror switch
passenger side is selected
OFF: Remote control mirror switch
passenger side is not selected
±
MIRR SEL SW LRemote control mirror switch driv-
er side/ON or OFF
ON: Remote control mirror switch
driver side is selected
OFF: Remote control mirror switch
driver side is not selected
±
MIRR POS SW RRemote control mirror switch R
position/ON or OFF
ON: Remote control mirror switch
R position is selected
OFF: Remote control mirror switch
R position is not selected
±

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1697
1891 Author: Date:
2005 SEQUOIA (RM1146U)DISP EX ON SEN
Display extinction luminous inten-
sity/NORMAL, DARK2, DARK1,
LIGHT1 or LIGHT2Customized condition will be dis-
played±
DISP EX OFF SEN
Display extinction release lumi-
nous intensity/NORMAL, DARK2,
DARK1, LIGHT1 or LIGHT2Customized condition will be dis-
played±
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relays, actuators and so on to operate
without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the methods
to shorten labor time.
It is possible to display the DATE 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 the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
SECURITY INDICTurn security indicator light ON/OFF±
SECURITY HORNTurn theft horn ON/OFFThis test is available only for vehicles equipped
with security horn.
BUZZ CONT SOUNDWireless buzzer continuous sound ON/OFF±
BUZZ RESP SOUNDTurn wireless buzzer ON/OFFTurn volume to MAX if it is a wireless buzzer
equipped vehicle.
HEAD LIGHTHeadlight relay ON/OFF±
TAIL LIGHTTaillight ON/OFF±
ILLUMI OUTPUTIlluminated entry system ON/OFFIG is ON, E/G is stopped and light control SW is
OFF.
ALL COURTESYDOOR indicator light ON/OFF±
VEHICLE HORNTurn vehicle horn ON/OFF±
RL P/W UP/DOWNRear left passenger power window DOWN/UPCaution: This test causes vehicle parts to move.
Watch your hands and feet.
RR P/W UP/DOWNRear right passenger power window DOWN/UPCaution: This test causes vehicle parts to move.
Watch your hands and feet.
DOOR LOCKDoor lock LOCK/UNLOCKAll doors are closed.

DI94R±07
I28393
Hood Courtesy Switch Engine Room J/B
 ECU±B Fuse
 Door No. 2 Fuse
 H±LP RH Fuse (*2)
 H±LP LH Fuse (*2)
 DRL Fuse (*1)
Rear Washer Motor
Horn
Headlight
Rear washer switch
Ignition Switch
 Key Unlock Switch
DLC3 Body ECU
Instrument Panel J/B
 ECU±IG Fuse
 RAD No. 2 Fuse
 FOG Fuse
 FOG LIGHT Relay
 POWER MAIN Relay
 WSH Fuse
 STOP Fuse
 TAILLIGHT Relay Back Door Power
Window SwitchTheft Horn
Engine Room R/B
No.2
 DIMMER Relay
 DRL No. 4 Relay
 H±LP RH Fuse (*1)
 H±LP LH Fuse (*1)
 H±LP RL Fuse (*1)
 H±LP LL Fuse (*1)
Fog Light
Wireless Door
Control Receiver Wireless Door Lock Buzzer
Combination Meter Memory Seat Switch
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running Light (Located behind
the instrument panel)
(Located behind
the heater control panel)
 DOME Fuse
 HEAD Relay
 HORN Relay
 DOME Fuse
Automatic Light Control Sensor
Stop Light Switch
Remote Control Mirror SwitchGlass Breakage
Sensor Microphone Glass Breakage
Sensor ECU
Combination Switch
 Light Control Switch
 Headlight Dimmer Switch
 Fog Light Switch DI±1698
± DIAGNOSTICSBODY CONTROL SYSTEM
1892 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION