2001 TOYOTA PRIUS Service Repair Manual

RS0R8±01
H15220
R09725Spiral Cable
H15507
H15678
H15676
RS±2
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2001 PRIUS (RM778U)
OPERATION
1. STEERING WHEEL PAD (with AIRBAG)
The inflater and bag of the SRS are stored in the steering wheel
pad and cannot be disassembled. The inflater contains a squib,
igniter charge, gas generator, etc., and inflates the bag when
instructed by the airbag sensor assembly.
2. SPIRAL CABLE (in COMBINATION SWITCH)
A spiral cable is used as an electrical joint from the vehicle body
side to the steering wheel.
3. FRONT PASSENGER AIRBAG ASSEMBLY
The inflater and bag of the SRS are stored in the front passen-
ger airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge, gas generator, etc., and in-
flates the bag when instructed by the airbag sensor assembly.
4. SIDE AIRBAG ASSEMBLY
The inflater and bag of the SRS side airbag are stored in the
side airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge, gas generator, etc., and in-
flates the bag when instructed by the side airbag sensor assem-
bly.
5. SEAT BELT PRETENSIONER
The seat belt pretensioner system is a component of the front
seat outer belt. The pretensioner contains a squib, gas genera-
tor, wire, piston, etc., and operates in the event of a frontal colli-
sion. The seat belt pretensioner cannot be disassembled.

H15218
H15513
H15517
H15675
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±3
2001 PRIUS (RM778U)
6. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly self±diagno-
sis. In normal operation conditions when the ignition switch is
turned to the ON position, the light goes on for about 6 seconds
and then goes off.
7. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit, ignition
control, drive circuit, etc. It receives signals from the airbag sen-
sor, front airbag sensor, side airbag sensor assembly and door
side airbag assembly and judges whether the SRS must be ac-
tivated or not. The airbag sensor assembly cannot be disas-
sembled.
8. FRONT AIRBAG SENSOR
The front airbag sensor is mounted inside each of the side
members. The sensor unit is a mechanical type. When the sen-
sor detects deceleration force above a predetermined limit,
contact is made in the sensor, sending a signal to the airbag
sensor assembly. The front airbag sensor cannot be disas-
sembled.
9. 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 a lat-
eral deceleration sensor, safing sensor, diagnosis circuit, etc.
It sends signals to the airbag sensor assembly to judge whether
the SRS side airbag must be activated or not. The side airbag
sensor assembly cannot be disassembled.

H15711
Airbag
Sensor
AssemblySide Airbag Sensor
Assembly (RH)
Side Airbag
Assembly (RH) (Squib)
Seat Belt
Pretensioner (RH)
Front Airbag Sensor (RH)
Front Passenger Airbag
Assembly (Squib)
Steering Wheel
Pad (Squib)
Front Airbag Sensor (LH)
Side Airbag
Assembly (LH) (Squib) Seat belt
Pretensioner (LH) 10 7
8
9
11
6
5
1213
4
14
15
16
2
1
3
Spiral Cable
Side Airbag Sensor
Assembly (LH) RS±4
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
2001 PRIUS (RM778U)
10. SRS CONNECTORS
HINT:
SRS connectors are located as shown in the following illustra-
tion.
No.ItemApplication
(1)Terminal Twin±Lock MechanismConnectors 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
(2)Airbag Activation Prevention MechanismConnectors 1, 2, 3, 4, 5, 6, 8, 9, 14, 15
(3)Electrical Connection Check MechanismConnectors 1, 2, 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
± SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS±5
2001 PRIUS (RM778U)
(a) All connectors in the SRS are colored in yellow to distin-
guish them from other connectors. Connectors having
special functions and specifically designed for the SRS
are used in the locations shown on the previous page to
ensure high reliability. These connectors use durable
gold±plated terminals.
(1) Terminal Twin±Lock Mechanism
Each connector has a two±piece component con-
sisting of a housing and a spacer. This design en-
ables the terminal to be locked securely by two lock-
ing devices (the retainer and the lance) to prevent
terminals from coming out.
(2) Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When
the connector is disconnected, the short spring
plate automatically connects positive (+) terminal
and negative (±) terminal of the squib.