2001 TOYOTA SEQUOIA DLC3 Ts

F19749
CAN J/C ºAº Side (w/ Earth Terminal)
Wire Harness View:
J56
G
WEarth Terminal
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1115
1309 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check for an open in one side of the CAN sub bus line (Suspension control ECU
sub bus line).
HINT:
For vehicles without an enhanced air suspension system, go to
step 3.
PREPARATION:
(a) Turn the ignition switch LOCK position.
(b) Disconnect the suspension control ECU sub bus line con-
nector (J56) from the CAN J/C.
NOTICE:

Check the colors of the wire harnesses before dis-
connecting the connector.

Before disconnecting the connector, make a note of
where it is connected.

Reconnect the connector to its original position.
(c) Connect the hand±held tester to the DLC3 via CAN VIM.
(d) Turn the ignition switch ON.
CHECK:
Select ºBUS CHECKº on the hand±held tester display via the
CAN VIM (see page DI±1073).
RESULT:
AºREAR AIRSUSº does not appear
B2 or more ECUs and/or sensors do not appear
A Go to step 4.
B
2 Connect the connector.
(a) Turn the ignition switch LOCK position.
(b) Reconnect the suspension control ECU sub bus line connector (J56) to the CAN J/C.
NEXT

DIDGI±01
H23977
Front Airbag Sensor LH
Side Airbag Sensor
Assembly LH (*1)
Curtain Shield Airbag
Sensor Assembly LH (*1)
Front Seat Inner Belt
LH/Seat Position Airbag
Sensor Assembly
RSCA OFF Switch (*1)
Front Seat Inner Belt RH
Occupant Classification
Sensors (Front LH, Front
RH, Rear LH, Rear RH)Steering Wheel Pad (D Squib)
Front Passenger Airbag Assembly (P Squib)
Side Airbag Assembly LH
(Side Squib LH) (*1)
Curtain Shield Airbag Assembly LH
(Curtain Shield Airbag LH Squib) (*1)
Front Seat Outer Belt LH (P/T Squib LH)
Combination Meter
(SRS Warning Light/RSCA OFF Indicator (*1))
Integration Control and Panel
(Passenger Airbag ON/OFF Indicator)
ECM
DLC3 Airbag
Sensor
Assembly
Occupant
Classification
ECU Front Airbag Sensor RH
Side Airbag Sensor
Assembly RH (*1)
Curtain Shield Airbag
Sensor Assembly RH (*1)Side Airbag Assembly RH
(Side Squib RH) (*1)
Curtain Shield Airbag Assembly RH
(Curtain Shield Airbag RH Squib) (*1)
Front Seat Outer Belt RH (P/T Squib RH)
*1: w/ Side and Curtain Shield Airbag DI±1120
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1314 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DIDGK±01
A08841
Hand±held Tester
DLC3
DI±1128
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1322 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
ZERO POINT CALIBRATION AND SENSITIVITY CHECK
NOTICE:
Make sure that the seat is not occupied before performing
the operation.
HINT:
Perform the zero point calibration and sensitivity check if any of
the following conditions occur.

The occupant classification ECU is replaced.

Accessories (seatback tray and seat cover, etc.) are
installed.

The passenger seat is removed from the vehicle.

The passenger airbag ON/OFF indicator (ºOFFº) comes
on when the passenger seat is not occupied.

The vehicle is brought to the workshop for repair due to
an accident or a collision.
Zero point calibration and sensitivity check procedures.
HINT:
Make sure that zero point calibration has finished normally, and
then perform the sensitivity check.
(1) Adjust the seat position according to the table be-
low.
Adjustment ComponentPosition
Slide DirectionRearmost position
Reclining AngleUpright position
Headrest HeightLowest position
Lifter HeightLowest position
(2) Connect the hand±held tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Perform the zero point calibration by following the
prompts on the tester screen shown in 2 pages lat-
er.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
OK:
The ºCOMPLETEº is displayed.

DI6P2±15
DI±1132
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1326 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspected AreaSee page

The front passenger seat condition differs from the indication by
the passenger airbag ON/OFF indicator (DTC is not output).
Trouble in indication of Passenger airbag ON/OFF indica-
torDI±1485

With the ignition switch is in ON position, the SRS warning light
sometimes comes on after approximately 6 seconds.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

The SRS warning light always comes on even when DTC is not
output.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

With the ignition switch is in the ON position, the SRS warning
light does not come on.
SRS warning light circuit (Does not come on, when igni-
tion switch is turned to the ON position)DI±1496

Although an SRS warning light operates normally, DTC or a
normal system code is not display.
TC terminal circuitDI±1498

Although terminals TC and CG of DLC3 are not connected, DTC
or a normal system code is display.
TC terminal circuitDI±1498

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

DIDGM±01
A04550
13 9 14 10 15 11 16 1251 62 73 84
DLC3
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1137
1331 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. CHECK DLC3
The vehicle's ECM uses ISO 14230 for communication. The ter-
minal arrangement of the DLC3 complies with SAE J1962 and
matches the ISO 14230 format.
Terminal No.Connection/Voltage or ResistanceCondition
7Bus
Line/Pulse generationDuring Transmission
4Chassis Ground e Body Ground/Below 1 WAlways
16Battery Positive e Body Ground/10 to 14 VAlways
HINT:
If the display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the OBD II scan tool or
hand±held tester to the DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.

If communication is normal when the tool is con-
nected to another vehicle, inspect the DLC3 on the
original vehicle.

If communication is still not possible when the tool
is connected to another vehicle, the problem is
probably in the tool itself, so consult the Service De-
partment listed in the tool's instruction manual.