2001 TOYOTA SEQUOIA ECU

H23921
H20065
H23922
H23923
H23924
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±5
3288 Author: Date:
2005 SEQUOIA (RM1146U)
9. FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the radiator
support. The front airbag sensor consists of an airbag sensor,
diagnosis circuit, etc. It sends signals to the airbag sensor as-
sembly to judge whether the SRS must be activated or not. The
front airbag sensor cannot be disassembled.
10. SIDE AIRBAG SENSOR ASSEMBLY
The side airbag sensor assembly is mounted in the LH and RH
center pillars. The side airbag sensor assembly consists of an
airbag sensor, diagnosis circuit, etc. It sends signals to the air-
bag sensor assembly to judge whether the SRS must be acti-
vated or not. The side airbag sensor assembly cannot be disas-
sembled.
11. CURTAIN SHIELD AIRBAG SENSOR ASSEMBLY
The curtain shield airbag sensor assembly is mounted in the LH
and RH quarter panels. The curtain shield airbag sensor as-
sembly consists of an airbag sensor, diagnosis circuit, etc. It
sends signals to the airbag sensor assembly to judge whether
the SRS must be activated or not. The curtain shield airbag sen-
sor assembly cannot be disassembled.
12. SEAT POSITION SENSOR ASSEMBLY
The seat position sensor assembly is mounted in the driver's
seat. The sensor unit consists of a magnet sensor, etc. It judges
the seat sliding position and sends the signal to the airbag sen-
sor assembly. The seat position sensor assembly cannot be
disassembled.
13. OCCUPANT CLASSIFICATION ECU
The occupant classification ECU is mounted in the passenger
seat. Based on the information sent from the occupant classifi-
cation ECU, the airbag sensor assembly determines whether
the SRS should be activated or not. The occupant classification
ECU cannot be disassembled.

H23944
Side Airbag
Sensor Assembly RH (*1)
Airbag Sensor
AssemblyFront Seat Outer
Belt Assembly RH
Front Seat Airbag
Assembly RH (Squib) (*1) 14 13
Front Airbag Sensor
LH
Side Airbag
Sensor Assembly LH (*1)
Seat Position
Airbag SensorFront Seat Airbag
Assembly LH (Squib)
Curtain Shield Airbag
Assembly LH (Squib) (*1) Front Airbag Sensor
RHFront Passenger
Airbag Assembly (Squib)
Front Seat Outer
Belt Assembly LH (*1)
Spiral Cable
Curtain Shield Airbag
Assembly RH (Squib) (*1)
10 9
8 7
6 5
4 3
2 1
4 3
6 5
8 7
10 9
12 1116 15
18 17
18 17
20 1922 2132 31
30 29
28 27
26 25
34 33
36 35
28 27
30 29
32 3124 23 Occupant
Classification ECU
Curtain Shield Airbag
Sensor Assembly RH (*1)
Curtain Shield Airbag
Sensor Assembly LH (*1)Steering Wheel
Pad (Squib) RCSA OFF Switch (*1) RCSA OFF Switch
(Light) (*1)
(*1) w/ Side Airbag and Curtain Shield Airbag
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±7
3290 Author: Date:
2005 SEQUOIA (RM1146U)
15. SRS CONNECTORS
HINT:
SRS connectors are located as shown in the following illustration.
No.Connector TypeApplication
(1)Terminal Twin±Lock MechanismConnectors 2, 4, 6, 8, 10, 18, 21, 25, 26, 27, 28
(2)Activation Prevention MechanismConnectors 2, 4, 22, 24, 26, 28, 30, 32
(3)Half Connection Prevention MechanismConnectors 6, 8, 10, 17, 21, 25, 27
(4)Connector Lock Mechanism (1)Connectors 23, 29, 31
(5)Connector Lock Mechanism (2)Connectors 2, 4
(6)Improper Connection Prevention Lock MechanismConnectors 1, 3

Z05953
Spacer
Housing
Female Male
R10587
When Connector is Connected When Connector is Disconnected
Short Spring Plate
Housing
Housing
Terminal
ConnectorsShort Spring PlateSquib
Closed CircuitSquib Short Spring Plate ONContacting Male Terminal Short Spring Plate
RS±8
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
3291 Author: Date:
2005 SEQUOIA (RM1146U)
(a) All connectors in the SRS, except the seat position airbag
sensor connector and occupant classification ECU con-
nectors, are colored yellow to distinguish them from other
connectors. These connectors have special functions,
and are specially designed for the SRS. All SRS connec-
tors use durable gold±plated terminals, and are placed in
the locations shown on the previous page to ensure high
reliability.
(1) Terminal Twin±Lock Mechanism
Each connector has a two±piece component con-
sisting of a housing and a spacer. This design al-
lows the terminal to be locked securely by two lock-
ing devices (the retainer and the lance) to prevent
terminals from coming out.
(2) Activation Prevention Mechanism
Each connector contains a short spring plate. When
the connector is disconnected, the short spring
plate automatically connects the positive (+) termi-
nal and negative (±) terminal of the squib.

C51019H20054
Stopper
Locking PartSpring
Slider
Locking Arm
Rebounded by Slider
(Spring)Stopper
H20055
Claw
GrooveLock Button
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±9
3292 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Half connection prevention mechanism:
If the connector is not completely connected, the
connector is disconnected due to the spring opera-
tion to the extent that no continuity exists.
(4) Connector lock mechanism (1):
Locking the connector lock button securely con-
nects the connector.

H23862
Lance
Retainer Holder
Retainer
1
2
H23916
AA
Lever
RS±10
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
3293 Author: Date:
2005 SEQUOIA (RM1146U)
(5) Connector lock mechanism (2):
Both the primary lock with holder lances and the
secondary lock with retainer prevent the connectors
from becoming disconnected.
(6) Improper connection prevention lock mechanism:
When connecting the holder, the lever is pushed
into the end by rotating around the A axis to lock the
holder securely.

H23907
(a)(b) Lock Button
(Yellow Part)Lock Button
(Yellow Part)
H23908
Lock Button
(Yellow Part)
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±11
3294 Author: Date:
2005 SEQUOIA (RM1146U)
16. DISCONNECTION OF CONNECTORS FOR STEERING WHEEL PAD AND CURTAIN SHIELD AIR-
BAG ASSEMBLY
(a) Release the lock button (yellow part) of the connector using a screwdriver.
(b) Insert the screwdriver tip between the connector and the base, and then raise the connector.
17. CONNECTION OF CONNECTORS FOR STEERING WHEEL PAD AND CURTAIN SHIELD AIRBAG
ASSEMBLY
(a) Connect the connector.
(b) Push down securely on the lock button (yellow part) of the connector. (When locking, a click sound can
be heard.)

H01586
SliderSlider
Disconnection is completed
H01587
Slider
Connection is completed
Slider RS±12
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
3295 Author: Date:
2005 SEQUOIA (RM1146U)
18. DISCONNECTION OF FRONT PASSENGNR AIRBAG ASSEMBLY
(a) Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
19. CONNECTION OF FRONT PASSENGNR AIRBAG ASSEMBLY
(a) Connect the connector as shown in the illustration. (When locking, make sure that the slider returns
to its original position and a click sound can be heard.)
HINT:
When connecting, the slider will slide. Be sure not to touch the slider while connecting, as it may result in
an insecure fit.

H23913
Connection is completed Lever
Holder (with connectors)
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±15
3298 Author: Date:
2005 SEQUOIA (RM1146U)
21. CONNECTION OF CONNECTOR FOR AIRBAG SENSOR ASSY CENTER
(a) Firmly insert the holder (with connectors) until it can not be pushed any further.
(b) Push the lever to connect the holder (with connectors). (When locking, a click sound can be heard.)
HINT:
The holder slides when connecting. Be sure not to hold the holder while connecting, as it may result in an
insecure fit.