2001 TOYOTA AVALON Service Repair Manual

H11971
Airbag Sensor
Assembly12
3
8
9
10
Side Airbag Assembly (RH)
(Squib)
11
12
13
14
Seat Belt Pretensioner (RH)
Side Airbag Sensor
Assembly (RH)
Front Airbag Sensor (RH)
5
Front Passenger Airbag
Assembly (Squib)
Spiral Cable7
Steering Wheel
Pad (Squib) 6
15
Front Airbag Sensor (LH)
Side Airbag Sensor
Assembly (LH)
Seat Belt Pretensioner (LH)
Side Airbag Assembly (LH)
(Squib) 4
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS-5
1525 Author
: Date
:
2001 AVALON (RM808U)
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
(2)Airbag Activation Prevention MechanismConnectors 1, 2, 3, 4, 5, 6, 7, 15
(3)Electrical Connection Check MechanismConnectors 1, 2, 3
(4)Connector Twin-Lock MechanismConnectors 5

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-6
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
1526 Author
: Date
:
2001 AVALON (RM808U)
(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.

R12076Airbag Sensor AssemblyDisconnection
Detection
PinSRS
Warning
Light
H01315
Terminal for Diagnosis
Disconnection Detection Pin
Half Connection
Complete Connection
Terminal for
Diagnosis
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS-7
1527 Author
: Date
:
2001 AVALON (RM808U)
HINT:
The type of connector is shown in the diagram on the previous
page.
(3) Electrical Connection Check Mechanism
This mechanism electrically checks that connectors
are connected correctly and completely. The electri-
cal connection check mechanism is designed so
that the disconnection detection pin connects with
the diagnosis terminals when the connector hous-
ing lock is locked.
HINT:
The illustration shows connectors º1º, º2º and º3º in step 10.

AB0089
Secondary Lock
Primary LockLockLock
Primary Lock Incomplete
(Secondary Lock Prevented)Primary Lock Complete
(Secondary Lock Permitted)Twin-Lock Completed
Z14034
Fig.1
Fig.2Power Source
Safing
Sensor
Squibs
Deceleration Sensor RS-8
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
1528 Author
: Date
:
2001 AVALON (RM808U)
(4) Connector Twin-Lock Mechanism
With this mechanism connectors (male and female
connectors) are locked by 2 locking devices to in-
crease the connection reliability. If the primary lock
is incomplete, ribs interfere and prevent the sec-
ondary lock.
(b) When the vehicle is involved in a frontal collision in the
hatched area (Fig. 1) and the shock is larger than the pre-
determined level, the SRS is activated automatically. A
safing sensor is designed to go on at a smaller decelera-
tion rate than the airbag sensor. As illustrated in Fig. 2,
ignition is caused when current flows to the squib, which
happens when a safing sensor and the deceleration sen-
sor go on simultaneously. When a deceleration force acts
on the sensors, 2 squibs in the driver airbag and front pas-
senger airbag ignite and generate gas. The gas discharg-
ing into the driver airbag and front passenger airbag rap-
idly increases the pressure inside the bags, breaking
open the steering wheel pad and instrument panel.
Bag inflation then ends, and the bags deflate as the gas
is discharged through discharge holes at the bag's rear or
side.

H01581
Outer
H01582
Lock of connector is released
Disconnection is completed
H01583
Outer
Outer
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS-9
1529 Author
: Date
:
2001 AVALON (RM808U)
11. DISCONNECTION OF CONNECTORS FOR FRONT
AIRBAG SENSOR AND SIDE AIRBAG SENSOR
(a) While holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.
(b) Lock of the connectors is released, then disconnect the
connectors.
HINT:
Be sure to hold both flank sides of the outer. If holding the top
and bottom sides, it will obstruct disconnection.
12. CONNECTION OF CONNECTORS FOR FRONT AIR-
BAG SENSOR AND SIDE AIRBAG SENSOR
(a) Align the male connector (of the side of sensor) and fe-
male connector in the same direction as shown in the il-
lustration and fit in them without rubbing.
(b) As they are fitted in, the outer slides rearward. Press it un-
til the outer returns to its original position again.
If fitting stops half way, connectors will separate.
(c) Be sure to insert until they are locked. After fitting in, pull
them slightly to check that they are locked (When locked,
make sure that the outer returns to its original position and
sound at the time of fitting in can be heard.).

H01584
Slider
Disconnection is completed Slider
H01585
SliderSlider
RS-10
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
1530 Author
: Date
:
2001 AVALON (RM808U)
HINT:
Do not fit in while holding the outer.
When fitting in, the outer slides. Do not touch it.
13. DISCONNECTION OF SIDE AIRBAG CONNECTOR
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.
14. CONNECTION OF SIDE AIRBAG CONNECTOR

H01586
Slider
Disconnection is completed Slider
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS-1 1
1531 Author
: Date
:
2001 AVALON (RM808U)
(a) Align a lock part of male connector and a slider of female
connector in the same direction as shown in the illustra-
tion, fit in them without rubbing.
(b) Be sure to insert until they are locked. After fitting in pull
them slightly to check that they are locked. (When locked,
make sure that the outer returns to its original position and
sound at the time of fitting in can be heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.
15. DISCONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Place a finger on the slider.
(b) Slide the slider to release lock.
(c) Disconnect the connector.

H01587
Slider
Slider
RS-12
- SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
1532 Author
: Date
:
2001 AVALON (RM808U)
16. CONNECTION OF CONNECTORS FOR STEERING
WHEEL PAD (with AIRBAG) AND FRONT PAS-
SENGER AIRBAG ASSEMBLY
(a) Align a lock part of male connector and a slider of female
connector in the same direction as shown in the illustra-
tion, fit in them without rubbing.
(b) Be sure to insert until they are locked. After fitting in pull
them slightly to check that they are locked. (When locked,
make sure that the outer returns to its original position and
sound at the time of fitting in can be heard.)
HINT:
As the slider slides, do not touch it.
Be careful not to deform the release board. If the release
board is deformed, replace it with a new one.