Lexus ES300 (2002 year). Manual - part 22

188

SRS

BB

5

1

W–

B

G–

Y

W–

B

W

2K

14

2N

5

10A
GAUGE1

2M

1

W

A

A

IA4

4

2D

1

2O

3

3A

57

3A

87

10A
HTR

From Power Source System (See Page 56)

2M

7

59 3A

L–

B

W

3A

29

B

12

A

16

B

B

Junction
Connector

J14

A

IO4

1

B–Y

G–Y

G–Y

G–Y

L–

Y

L–

Y

L

–

Y

G–

Y

40

12

5

21

3B

84

3B

64

3B

54

3B

74

(*1)
(*2)

(*1)
(*2)

ID

BR

BR

2

W

W

W

W

SRS

Power

Micro Computer

PBEW

IG

Junction
Connector

J 5

A/C Control
Assembly

A14(A), A15(B)

Combination Meter

C 7

* 1 : w/ VSC
* 2 : w/o VSC

Bu

c

k

le

 SW

 R

H

B 8

G–

Y

4

G–Y

O

c

cu

pant

De

te

c

ti

o

n

S

ens

or

B–

R

Y

L

B

189

The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ON, the current from the ECU–IG fuse flows to TERMINAL (B) 6 of the airbag sensor
assembly, and from the IG2 fuse to TERMINAL (B) 5 of the airbag sensor assembly.
If an accident occurs while driving, when the frontal impact exceeds a set level, the current from the ECU–IG or IG2 fuse
flows to TERMINALS (B) 14, (B) 16, (B) 10, (B) 8, (A) 12, (C) 5, (A) 9, (C) 8, (A) 8 and (C) 9 of the airbag sensor assembly to
the airbag squibs and the pretensioners to TERMINALS (B) 13, (B) 17, (B) 11, (B) 7, (A) 11, (C) 6, (A) 10, (C) 7, (A) 7 and (C)
10 of the airbag sensor assembly to TERMINAL (B) 27, (B) 28 or BODY GROUND to GROUND, so that current flows to the
airbag squibs and the pretensioners and causes them to operate.
When the side impact also exceeds a set level, the current from the ECU–IG or IG2 fuse flows to TERMINALS (A) 12, (C) 5,
(A) 9 and (C) 8 of the airbag sensor assembly to the side airbag squibs and the curtain shield airbag squibs TERMINALS (A)
11, (C) 6, (A) 10 and (C) 7 of the airbag sensor assembly to TERMINAL (B) 27, (B) 28 or BODY GROUND to GROUND,
causing side airbag squibs and curtain shield airbag squibs to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored inside the passenger’s instrument panel is instantaneously expanded to soften the shock to the front
passenger.
Side airbags are instantaneously expanded to soften the shock of side to the driver and front passenger.
The curtain shield airbag can ease an impact on the head of the front and rear passengers and reduce risks of injury.
The pretensioners make sure of the seat belt restrainability.

  :  Parts Location

Code

See Page

Code

See Page

Code

See Page

A12

36

A35

38

J5

39

A13

36

B7

42

J14

40

A14

A

38

B8

42

P11

41

A15

B

38

C7

38

P12

41

A30

A

38

C14

40

S16

41

A31

B

38

C15

40

S17

41

A32

C

38

C16

40

S22

42

A33

38

C17

40

S23

42

A34

38

D2

38

: Junction Block and Wire Harness Connector

Code

See Page

Junction Block and Wire Harness (Connector Location)

1C

25

Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

2D

28

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

2G

28

Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)

2K

28

Floor No.1 Wire and Driver Side J/B (Lower Finish Panel)

2L

2M

2N

29

Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)

2O

(

)

2R

3A

34 (w/ VSC)

3A

35 (w/o VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

34 (w/ VSC)

Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)

3B

35 (w/o VSC)

: Connector Joining Wire Harness and Wire Harness

Code

See Page

Joining Wire Harness and Wire Harness (Connector Location)

IA4

46

Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)

IF1

46

Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)

IO4

48

Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)

System Outline

190

SRS

: Ground Points

Code

See Page

Ground Points Location

IA

46

Instrument Panel Reinforcement LH

ID

46

Instrument Panel Brace RH

BA

50

Under the Driver’s Seat

BB

50

Under the Front Passenger’s Seat

192

Electric Modulated Suspension

B

14

B

23

A

2

A

7

GND

MOD2

FBL+

FBL–

ED

A

3

A

1

FAL+

FAL–

E 4

IF2

7

IF2

6

A

A

A

IB

A

9

A

8

SS2+

SS2–

A

IF2

5

IF2

4

IA

B

21

B

20

SW1

SW2

2L

8

2R

8

3B

20

3B

70

ESS

ECU1

ECU2

GND

SS2+

SS2–

S

teer

ing S

ens

or

S 9

Junction
Connector

J 1

Junction
Connector

J 4

Absorber Control SW

A23

Absorber Control
Actuator Front LH

A 8

2

1

2

3

4

5

4

12

1

4

2

10A
FAN
RLY

From Power Source System (See Page 56)

2F

9

B

1

IF4

3

IF4

2

IF4

5

B

4

B

5

B

3

IO5

3

IO5

1

IO5

2

B

16

B

18

B

17

IF2

16

IF2

14

IF2

15

IF2

18

A

10

3

1

2

1

3

2

25

GL1

VGS

GGND

GL1

VGS

GGND

HARD

SGFL

SBL

+B

SGL

SGRR

SBR

SGR

HARD

GR

G

R

Skid

 C

o

n

tr

o

l EC

U

S 6

15A
STOP

2G

13

1

2

2G

7

19

B

2

2G

G–

W

STP

G–

W

W

S

top

 Li

g

h

t S

W

S1

3

B–

R

W–

B

W–

B

W–

B

L–

Y

L–

W

L

L–

B

R

G

R

G

Y

V

Y

V

W–

B

SB

W–

B

W–

B

O

V–

Y

B–

R

O

V–

Y

B–

R

P–

L

LG

–R

GR

–

B

P–

L

LG

–R

GR

–

B

P–

L

LG

–R

GR

–

B

W–

B

W

–

B

W–B

W–

B

Absorber Control ECU

A21(A), A22(B)

Acceleration Control
Sensor Front LH

A24

Acceleration Control
Sensor Rear RH

A40

*  1 : w/ Headlight Beam Level Control System