Lexus GS300/400 (2000 year). Service manual — part 241

R12076

Airbag Sensor Assembly

Disconnection

Detection

Pin

SRS

Warning

Light

H00955

Terminal for Diagnosis

Disconnection Detection Pin

Half Connection

Complete Connection

Terminal for
Diagnosis

RS–6

–

SUPPLEMENTAL RESTRAINT SYSTEM

SRS AIRBAG

2237

HINT:
The type of connector shown on the previous page is used for
the spiral cable connector ”5” on the airbag sensor assembly
side.

(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 above illustration shows connectors ”1”, ”2” and ”3”.

AB0089

Secondary Lock

Primary Lock

Lock

Lock

Primary Lock Incomplete

(Secondary Lock Prevented)

Primary Lock Complete

(Secondary Lock Permitted)

Twin–Lock Completed

Z14034

Fig.1

Fig.2

Power Source

Safing

Sensor

Squibs

Airbag Sensor

–

SUPPLEMENTAL RESTRAINT SYSTEM

SRS AIRBAG

RS–7

2238

(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 airbag sensor go
on simultaneously. When a deceleration force acts on the
sensors, 2 squibs in the driver airbag and front passenger
airbag ignite and generate gas. The gas discharging into
the driver airbag and front passenger airbag rapidly in-
creases the pressure inside the bags, breaking open the
steering wheel pad and instrument panel door.
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

RS–8

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SUPPLEMENTAL RESTRAINT SYSTEM

SRS AIRBAG

2239

11.

DISCONNECTION OF AIRBAG SENSOR CONNEC-
TOR

(a)

With holding both flank sides of the outer, slide the outer
to the direction shown by an arrow.

(b)

When lock of the connectors is released disconnect the
connector.

HINT:
Make sure to hold both flank sides of the outer. If holding the top
and bottom sides, it obstructs disconnection.

12.

CONNECTION OF AIRBAG SENSOR CONNECTOR

(a)

Align the male connector (on 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 on the half way, connectors will separate.
(c)

Make sure to insert until the connectors are locked. After
fitting in, pull them lightly to check that they are locked.
(When locked, make sure that the outer returns to its origi-
nal position and sound at the time of fitting in can be
heard.)

HINT:

Do not fit in with holding the outer.

When fitting in, the outer slides. Do not touch it.

H01584

Slider

Disconnection is completed

Slider

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SUPPLEMENTAL RESTRAINT SYSTEM

SRS AIRBAG

RS–9

2240

13.

DISCONNECTION OF SIDE AIRBAG CONNECTOR

(a)

Place a finger on the slider.

(b)

Slide the slider to release lock.

(c)

Disconnect the connector.