2001 TOYOTA SEQUOIA shield

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

DIDGJ±02
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1121
1315 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM
(a) General description.
In this system, the airbag sensor assembly installed on the floor under the A/C unit determines whether
or not to activate the SRS airbags (driver airbag, passenger airbag, front seat airbags and curtain
shield airbags) and seat belt pretensioners by receiving the collision signal from each sensor (exclud-
ing the airbag sensor assembly). When there is trouble in the system, the airbag sensor assembly turns
on the SRS warning light on the combination meter to inform the driver.
(b) Description of the dual stage control.
The airbag sensor assembly controls the dual stage deployment of the driver airbag in the steering
wheel pad and the passenger airbag on the instrument panel. The airbag sensor assembly controls
the dual stage deployment of the driver airbag according to the collision impact, seat position and seat
belt ON/OFF state. It also controls the dual stage deployment of the passenger airbag according to
the collision impact and seat belt ON/OFF state.
(c) Description of the roll±over function.
(1) The airbag sensor assembly detects inclination signals from the inclination sensor installed on
the vehicle. The roll±over function ensures passenger safety by using these signals to activate
the RH and LH curtain shield airbag assembly and seat belt pretensioner when vehicle inclination
exceeds the specified value.
(2) An RSCA OFF switch (roll±over sensing curtain shield airbag OFF switch), which allows optional
deactivation of the roll±over function, is installed on the vehicle.
(d) Description of check mode (signal check).
This airbag sensor assembly is operable using the check mode of the hand±held tester function. Check
mode can detect and output DTC by using a hand±held tester to switch the airbag sensor assembly
to the check mode.
A simulation method is used, if the malfunction cannot be reproduced during troubleshooting (the mal-
function is temporarily solved, etc.). In this case, joggling each connector, or driving on a city or rough
road with the airbag sensor assembly in check mode makes it possible to obtain a more accurate mal-
function condition.

H23978Fig. 1Fig. 2 Airbag Sensor Assembly
Safing Sensor
ON
Deceleration
Sensor ONAirbag Inflating
AND
H23979
Airbag Sensor Assembly
Deceleration
Sensor ONAirbag Inflating
AND
Side Airbag Sensor Assembly
Electronic Safing
Sensor ON
DI±1122
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1316 Author: Date:
2005 SEQUOIA (RM1146U)
2. IGNITION JUDGEMENT AND CONDITIONS
(a) Operation in case of front collision.
(1) When the vehicle collides in the hatched area (Fig. 1) and shock is larger than a predetermined
level, the airbags (driver and front passenger) are activated automatically. The deceleration sen-
sor of the airbag sensor assembly determines the need for ignition in response to collisions within
the hatched area based on the signal from the deceleration sensor of the front airbag sensor.
(2) Safing sensor of the airbag sensor assembly is designed to activate at by a smaller deceleration
rate than the deceleration sensor. As illustrated in Fig. 2 below, when both the safing sensor and
deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.
(b) w/ Side and curtain shield airbag:
Operation in case of front side collision.
Electronic safing sensor of the airbag sensor assembly is designed to activate at a smaller deceleration
rate than the deceleration sensor of the side airbag sensor assembly. As illustrated below, when both
the electronic safing sensor and deceleration sensor go on simultaneously, current flows to the squib
and ignition occurs.

H23980
Side Airbag Assembly
Deployment Signal
Deceleration Sensor ON
Electric Safing Sensor ONANDOR Airbag Inflating Curtain Shield Airbag Sensor Assembly
Airbag Sensor AssemblyCurtain Shield Airbag Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1123
1317 Author: Date:
2005 SEQUOIA (RM1146U)
(c) w/ Side and curtain shield airbag:
Operation in case of rear side collision.
Electronic safing sensor of the airbag sensor assembly is designed to activate at a smaller deceleration
rate than the deceleration sensor of the curtain shield airbag sensor assembly. As illustrated below,
when both the electronic safing sensor and deceleration sensor go on simultaneously, current flows
to the squib and ignition occurs.

H24635
Rollover Detection:
Side Collision and Rollover Detection:(a)
(b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)
(c) (b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Sensor Assembly
Side Airbag Sensor
Assembly (
)Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)Side Airbag of Collision
Side (
)
Activate depending on the
condition of the collision.
: DI±1124
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1318 Author: Date:
2005 SEQUOIA (RM1146U)
(d) w/ Side and curtain shield airbag:
Roll sensing of curtain shield airbag control.
(1) The airbag sensor assembly contains a roll rate sensor and roll rate sensor (that determine the
inclination angle the vehicle) and a lateral deceleration sensor (that determine the lateral force
that is applied to the vehicle). These sensors detect the vehicle's roll angle, rotational speed, and
lateral acceleration speed.
(2) Based on the information obtained from sensors, the airbag sensor assembly makes an overall
judgment of the vehicle's roll angle rotational speed, and lateral acceleration speed. If the airbag
sensor determines that the vehicle has rolled over due to cause other than the side collision, it
deploys the right and left curtain shield airbags and the front right and left seat belt pretensioners.
(3) This system provides a roll sensing of curtain shield airbags cutoff switch (RSCA OFF switch)
on the driver side of the instrument panel with which the driver can stop the operation of the func-
tion.
(4) By operating the RSCA OFF switch and while the roll sensing of the curtain shield airbag control
is OFF, and when the airbag sensor assembly judges to operate the side and curtain shield air-
bag system in the event of side collision, it is no need prohibit this operation.

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

H24029
Curtain Shield Airbag
Sensor Assembly RH
(*1)
Side Airbag Sensor
Assembly RH (*1)
Front Airbag
Sensor RH
RSCA OFF Switch
(*1)
Airbag Sensor
Assembly
Front Airbag
Sensor LH
Side Airbag Sensor
Assembly LH (*1)
Curtain Shield AIrbag
Sensor Assembly LH
(*1)Spiral CableTo
Occupant
Classification ECU
Front Seat Outer
Belt RH
(P/T Squib RH)
Side Airbag
Assembly RH
(Side Squib RH) (*1)
Front Passenger
Airbag Assembly
(P Squib)
Integration Control
and Panel
(Passenger Airbag
ON/OFF Indicator)
Combination Meter
(SRS Warning Light/
RSCA OFF Indicator
(*1))
Steering Wheel
Pad (D 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)
Seat Position AIrbag
Sensor Assembly/
Front Seat Inner Belt LH
(Buckle Switch LH)Curtain Shield Airbag
Assembly RH
(Curtain Shield Airbag
RH Squib) (*1)
9 13
10 14
11
1512
16 15
2 6
37
4 8
25 29
26 30
27 33
28 34
1721
1822
19 23
2024
3
4
7
89
10
13
14 11
1227
28
29
30 31
32
31
32 DI±1144
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1338 Author: Date:
2005 SEQUOIA (RM1146U)