O2 sensor TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1129
1323 Author: Date:
2005 SEQUOIA (RM1146U)
(5) Perform the sensitivity check by following the
prompts on the tester screen shown in 2 pages lat-
er.
(6) Confirm that the beginning sensor reading is within
the standard value.
OK:
Standard value: ±3.2 to 3.2 kg (±7 to 7 lb)
(7) Place a 30 kg (66.14 lb) weight (eg. a 30 kg (66.14
lb) of lead mass) onto the passenger seat.
(8) Confirm that the sensitivity is within the standard
value.
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
HINT:

When performing the sensitivity check, use a solid metal
weight (the check result may not appear properly if the
weight made from liquid is used).

When the sensitivity deviates from the standard value, re-
tighten the bolts of the passenger seat taking care not to
deform the seat rail. After performing this procedure, if the
sensitivity is not within the standard value, replace the
front seat assembly RH.

When zero point calibration has not finished normally, re-
place the front seat assembly RH.

DIAGNOSTIC MENU
OCCUPANT DETECT
1: DATA LIST
2: DTC INFO
5: ZERO CALIBRATION
6: SENSITIVITY CHK 4: SNAPSHOT
NOTICE
Please confirm seat
position.
Slide: Max rear
Recline: Max upright
Headrest: Max down
Lifter: Max down
PRESS [ENTER] or [EXIT]NOTICE
Confirm that
nothing is placed
on the passenger
seat.
PRESS [ENTER] or [EXIT]
NOTICE
Do you wish to
start ºZERO
CALIBRATIONº?
PRESS [YES] or [NO]ZERO CALIBRATION
COMPLETED
Next, perform the
SENSITIVITY CHECK.
PRESS [ENTER]
ZERO POINT CALIBRATION PROCEDURE
º1: DIAGNOSISº ± º1: OBD/MOBDº ± ºMODEL YEARº ± ºMODEL SELECTION = SEQUOIAº ±
Select the option parts ± º9: OCCUPANT DETECTº ± Refer to the following screen flow.
ZERO CALIBRATION
FAILED
EEPROM writing error
Please check DTCs
PRESS [ENTER]ZERO CALIBRATION
FAILED
Failed to SECURITY
ACCESS.
PRESS [ENTER]Try again
ZERO CALIBRATION
FAILED
Sensor range
Front Left
PRESS [ENTER] over malfunction
Front Right
Rear Left
Rear Right±±±±[ ]
±±±±[ ]
±±±±[ ]
±±±±[ ]Sensor information is
expressed as OK, MAX or MIN
in [ ].
If MAX or MIN is displayed,
replace the front seat assembly RH. Perform sensitivity check.
Perform DTC check and repair. DI±1130
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1324 Author: Date:
2005 SEQUOIA (RM1146U)

SENSITIVITY CHECK PROCEDURE
º1: DIAGNOSISº ± º1: OBD/MOBDº ± ºMODEL YEARº ± ºMODEL SELECTION = SEQUOIAº ±
Select the option parts ± º9: OCCUPANT DETECTº ± Refer to the following screen flow.
DIAGNOSTIC MENU
OCCUPANT DETECT
1: DATA LIST
2: DTC INFO
5: ZERO CALIBRATION
6: SENSITIVITY CHK 4: SNAPSHOT
NOTICE
Please confirm
that nothing is
placed on the
passenger seat.
PRESS [ENTER] or [EXIT]SENSITIVITY CHECK
Beginning sensor
reading should be
±3.2 to 3.2 kg.
PRESS [ENTER]
SENSITIVITY CHECK
PRESS [ENTER]
(±7 to 7 lbs)
Sensor reading
0.00 kg
Place 30 kg (66 lbs)
weight on passenger
seat. Sensor reading
should be 27 to 33 kg.
(59 to 73 lbs)
Sensor reading
0.00 kg*1: kg @ lb
Unit can be changed based on unit conversion setting.
[System Selection Screen]
º1: DIAGNOSISº ± º9: SETUPº ± º4: UNIT CONVERSIONº
± ºWEIGHTº (kg @ lbs) (*1)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1131
1325 Author: Date:
2005 SEQUOIA (RM1146U)

DIDGL±01
H24009
A19A20A21
17
24 18
23 19
22 20
21 4 8372615
12 13 11 14 10
15 9
16
28 27 26 25 30 294 8372615 4 8372615
10 9 12 13 11 14 15 16 10 9 12 13 11 14 15 16
17 18 19 20 24 23 22 21 17 18 19 20 24 23 22 21
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1133
1327 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. AIRBAG SENSOR ASSEMBLY
Terminal No.Terminal SymbolDestination
A19±1 (*1)SFL+Side airbag assembly LH (Side squib LH)
A19±2 (*1)SFL±Side airbag assembly LH (Side squib LH)
A19±3 (*1)ICL±Curtain shield airbag assembly LH (Curtain shield airbag LH
squib)
A19±4 (*1)ICL+Curtain shield airbag assembly LH (Curtain shield airbag LH
squib)
A19±5PL+Front seat outer belt LH (P/T squib LH)
A19±6PL±Front seat outer belt LH (P/T squib LH)
A19±9LSP+Seat position airbag sensor assembly
A19±10LBE+Front seat inner belt RH (Seat belt buckle switch LH)
A19±17LSP±Seat position airbag sensor assembly
A19±18LBE±Front seat inner belt RH (Seat belt buckle switch LH)
A19±19 (*1)VUPLSide airbag sensor assembly LH
A19±20 (*1)VUCLCurtain shield airbag sensor assembly LH
A19±21 (*1)ESLSide airbag sensor assembly LH
A19±22 (*1)ESCLCurtain shield airbag sensor assembly LH
A20±1P2+Front passenger airbag assembly (P squib (Dual stage ± 2nd
step))
A20±2P2±Front passenger airbag assembly (P squib (Dual stage ± 2nd
step))
A20±3P±Front passenger airbag assembly (P squib)
A20±4P+Front passenger airbag assembly (P squib)
A20±5D+Steering wheel pad (D squib)
A20±6D±Steering wheel pad (D squib)
A20±7D2±Steering wheel pad (D squib (Dual stage ± 2nd step))
A20±8D2+Steering wheel pad (D squib (Dual stage ± 2nd step))
A20±13PBEWIntegration control and panel (Seat belt warning light)
A20±14LACombination meter (SRS warning light)
A20±15TCDLC3

DI±1134
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1328 Author: Date:
2005 SEQUOIA (RM1146U)A20±16
SILDLC3
A20±17P±ABIntegration control and panel (Passenger airbag ON/OFF indi-
cator)
A20±18GSWBody ECU
A20±19 (*1)RMSWRSCA cutoff switch
A20±20 (*1)RMILCombination meter (RSCA OFF indicator)
A20±21IG2IGN1 Fuse (Power source)
A20±22GSW2ECM
A20±23PAONIntegration control and panel (Passenger airbag ON/OFF indi-
cator)
A20±25E1Ground
A20±26E2Ground
A20±27±SRFront airbag sensor RH
A20±28±SLFront airbag sensor LH
A20±29+SRFront airbag sensor RH
A20±30+SLFront airbag sensor LH
A21±3PR±Front seat outer belt RH (P/T squib RH)
A21±4PR+Front seat outer belt RH (P/T squib RH)
A21±5 (*1)ICR+Curtain shield airbag assembly RH (Curtain shield airbag RH
squib)
A21±6 (*1)ICR±Curtain shield airbag assembly RH (Curtain shield airbag RH
squib)
A21±7 (*1)SFR±Side airbag assembly RH (Side squib RH)
A21±8 (*1)SFR+Side airbag assembly RH (Side squib RH)
A21±16FSR+Occupant classification ECU
A21±19 (*1)ESCRCurtain shield airbag sensor assembly RH
A21±20 (*1)ESRSide airbag sensor assembly RH
A21±21 (*1)VUCRCurtain shield airbag sensor assembly RH
A21±22 (*1)VUPRSide airbag sensor assembly RH
A21±24FSR±Occupant classification ECU
*1: w/ Side and curtain shield airbag

H22556
O6
O7
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1135
1329 Author: Date:
2005 SEQUOIA (RM1146U)
2. OCCUPANT CLASSIFICATION ECU
Terminal No. (Symbols)Wiring ColorTerminal DescriptionConditionSpecification
O6±1 (+B) ±
O6±3 (GND)W±R ± W±BBatteryIgnition switch ON10 to 14 V
O6±2 (DIA) ±
O6±3 (GND)G±R ± W±BDiagnosis (DLC3)Ignition switch ONPulse generation
O6±3 (GND) ±
Body groundW±B ± Body groundGroundAlwaysBelow 1 V
O6±4 (FSR±) ±
O6±3 (GND)B ± W±BAirbag sensor assy center
communication line (±)AlwaysBelow 1 V
O6±5 (BGND) ±
O6±3 (GND)L ± W±BPassenger side buckle
switch ground lineAlwaysBelow 1 V
O6±7 (IG) ± O6±3 (GND)B±O ± W±BPower source (IGN1 Fuse)Ignition switch ON10 to 14 V
O6±8 (FSR+) ±
O6±4 (FSR±)W ± BAirbag sensor assy center
communication lineIgnition switch ONPulse generation
O6±9 (BSW) ±
O6±5 (BGND)R ± LPassenger side buckle
switch lineAlwaysPulse generation
O7±1 (SGD1) ±
O6±3 (GND)O ± W±BOccupant classification
sensor front LH ground lineAlwaysBelow 1 V
O7±2 (SGD2) ±
O6±3 (GND)B±Y ± W±B
Occupant classification
sensor front RH ground
line
AlwaysBelow 1 V
O7±3 (SGD3) ±
O6±3 (GND)R±B ± W±BOccupant classification
sensor rear LH ground lineAlwaysBelow 1 V
O7±4 (SGD4) ±
O6±3 (GND)R±W ± W±BOccupant classification
sensor rear RH ground lineAlwaysBelow 1 V
O7±5 (SVC3) ±
O7±3 (SGD3)Y±B ± R±B
Occupant classification
sensor rear LH power sup-
ply lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor rear LH
4.5 to 5.1 V
O7±6 (SVC4) ±
O7±4 (SGD4)Y ± R±W
Occupant classification
sensor rear RH power sup-
ply lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor rear RH
4.5 to 5.1 V
O7±7 (SIG1) ±
O7±1 (SGD1)G ± OOccupant classification
sensor front LH signal lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor front LH
0.2 to 4.9 V
O7±8 (SIG2) ±
O7±2 (SGD2)LG ± B±YOccupant classification
sensor front RH signal lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor front RH
0.2 to 4.9 V
O7±9 (SIG3) ±
O7±3 (SGD3)G±B ± R±BOccupant classification
sensor rear LH signal lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor rear LH
0.2 to 4.9 V
O7±10 (SIG4) ±
O7±4 (SGD4)L±W ± R±WOccupant classification
sensor rear RH signal lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor rear RH
0.2 to 4.9 V

DI±1136
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1330 Author: Date:
2005 SEQUOIA (RM1146U)O7±11 (SVC1) ±
O7±1 (SGD1)
V ± O
Occupant classification
sensor front LH power sup-
ply lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor front LH
4.5 to 5.1 V
O7±12 (SVC2) ±
O7±2 (SGD2)P ± B±Y
Occupant classification
sensor front RH power
supply lineIgnition switch ON, a load
is applied to occupant clas-
sification sensor front RH
4.5 to 5.1 V

H22553
Vibrate Slightly
Shake Slightly
Vibrate Slightly DI±1138
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1332 Author: Date:
2005 SEQUOIA (RM1146U)
2. SYMPTOM SIMULATION
HINT:
The most difficult case in troubleshooting is when no symptoms
occur. In such cases, a thorough customer problem analysis
must be carried out. Then the same or similar conditions and
environment in which the problem occurred in the customer's
vehicle should be simulated. No matter how experienced or
skilled a technician may be, if he proceeds to troubleshoot with-
out confirming the problem symptoms, he will likely overlook
something important and make a wrong guess at some points
in the repair operation. This leads to a standstill in troubleshoot-
ing.
(a) Vibration method: When vibration seems to be the major
cause.
HINT:
Perform the simulation method only during the primary check
period (for approximately 6 seconds after the ignition switch is
turned to the ON position).
(1) Slightly vibrate the part of the sensor considered to
be the problem cause with your fingers and check
whether the malfunction occurs.
HINT:
Shaking the relays too strongly may result in open relays.
(2) Slightly shake the connector vertically and horizon-
tally.
(3) Slightly shake the wire harness vertically and hori-
zontally.
The connector joint and fulcrum of the vibration are
the major areas to be checked thoroughly.
(b) Simulation method for DTC B1794: Turn the ignition
switch from the LOCK to ON, hold for 10 seconds, and
back to LOCK again 50 times in a row.
HINT:
DTC B1794 is output if the occupant classification ECU re-
ceives the ignition switch LOCK±ON±LOCK signal 50 times in
a row when a malfunction occurs in the power circuit for the oc-
cupant classification system.

H23984
6 seconds
Ignition Switch
SRS Warning
Light (*1)
SRS Warning
Light (*2)
*1: SRS airbag system is normal
*2: SRS airbag system has trouble ON
OFF
ON
OFF
ON
OFF
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1139
1333 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF SRS WARNING LIGHT
(a) Primary check.
Turn the ignition switch to the LOCK position. Wait for at least 2 seconds, then turn the ignition switch
to the ON position. The SRS warning light comes on for approximately 6 seconds and the SRS airbag
system diagnosis (including the seat belt pretensioner and occupant classification system) is per-
formed.
HINT:
If trouble is detected during the primary check, the SRS warning light remains on even after the primary
check period (for approximately 6 seconds) has elapsed.
(b) Constant check.
After the primary check, the airbag sensor assembly constantly monitors the SRS airbag system for
trouble.
HINT:
If trouble is detected during the constant check, the airbag sensor assembly functions as follows:

The SRS warning light comes on.

The SRS warning light goes off, and then comes on. This blinking pattern indicates the source voltage
drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.

DI±1140
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1334 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Review.
(1) When the SRS airbag system is normal:
The SRS warning light comes on only during the primary check period (for approximately 6 se-
conds after the ignition switch is turned to the ON position).
(2) When the SRS airbag system has trouble:

The SRS warning light remains on even after the primary check period has elapsed.

The SRS warning light goes off after the primary check, but comes on again during the
constant check.

The SRS warning light does not come on when turning the ignition switch from the LOCK
to ON position.
HINT:
The airbag sensor assembly keeps the SRS warning light on if the airbag has been deployed.
4. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR
The passenger airbag ON/OFF indicator function as follows:
(1) Turn the ignition switch to the ON position.
(2) The passenger airbag ON/OFF indicator (ºONº and ºOFFº) comes on for approximately 4 se-
conds, then goes off for approximately 2 seconds.
(3) Approximately 6 seconds after the ignition switch is turned to the ON position, the passenger
airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below.
HINT:
If the front passenger seat condition and the indication by the passenger airbag ON/OFF indicator differ from
those shown in the table below, and the SRS warning light is off, then the DTC is not output. If this occurs,
perform troubleshooting of ºTrouble in indication of Passenger airbag ON/OFF indicatorº (see page
DI±1485).
ConditionºONº indicatorºOFFº indicator
VacantOFFOFF
Adult is seated.ONOFF
Child is seated.OFFON
Child restraint system (CRS) is set.OFFON
Occupant classification system failureOFFON