Lexus ES300 (1997 year). Manual - part 653

206

SRS

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

10A

ECU–B

2J

7

1

2

SPIRAL

CABLE

II

IF

10

9

8

5

5

11

2

3

6

7

16

15

B–

O

GR

Y–

B

Y

Y–

R

Y–

G

P–

B

B–

Y

W–

B

W–

B

B–

Y

IG2

ACC

D+

D–

P+

P–

E1

E2

TC

LA

AIRBAG SQUIB

(STEERING

 WHEEL PAD)

A31

AIRBAG SENSOR ASSEMBLY

A29

WARNING

B.  METER]

TC

AB

1

2

AIRBAG SQUIB

(FRONT PASSENGER

 AIRBAG ASSEMBLY)

A30

1N

3

1V

3

W–

B

1N

1

1J

7

W–

B

W–

R

W–

R

IG2

2

B

B

A

A

A

IK3

7

IK3

11

LG

–R

LG

LG

–R

LG

B–Y

A

JUNCTION

CONNECTOR

J15

JUNCTION

CONNECTOR

J 1

A

C

B

B

IK3

6

ED

A

3

3

A

A

4

E1

BR

LG–R

BR

BR

BR

B

R

B

JUNCT

IO

N

CO

NN

E

C

T

O

R

B

J 

8

, J

 9

A

DA

T

A

 L

IN

K

CO

NN

E

C

T

O

R 2

JUNCTION

CONNECTOR

J24

D 3

TC

E1

D 1
DATA LINK
CONNECTOR 1

9

8

SRS 

LIGHT

[COM

C10

5A

IGN

1N

4

15A

CIG

1N

2

1W

3

1G

2

207

THE SRS IS A DRIVER AND PASSENGER PROTECTION DEVICE WHICH HAS A SUPPLEMENTAL ROLE TO THE SEAT
BELTS. WHEN THE IGNITION SW IS TURNED TO ACC OR ON, CURRENT FROM THE CIG FUSE FLOWS TO TERMINAL
16 OF THE AIRBAG SENSOR ASSEMBLY. ONLY WHEN THE IGNITION SW IS ON DOES THE CURRENT FROM THE IGN
FUSE TO TERMINAL 15. IF AN ACCIDENT OCCURS WHILE DRIVING, WHEN THE FRONTAL IMPACT EXCEEDS A SET
LEVEL, CURRENT FROM THE CIG OR IGN FUSE FLOWS TO TERMINALS 7 AND 3 OF THE AIRBAG SENSOR
ASSEMBLY 

→

 TERMINAL 1 OF THE AIRBAG SQUIBS 

→

 TERMINAL 2 

→

 TERMINAL 6 AND 2 OF THE AIRBAG SENSOR

ASSEMBLY 

→

 TERMINAL 9 OR TERMINAL 10 OR BODY GROUND 

→

  GROUND, SO THAT THE CURRENT FLOWS TO

THE AIRBAG SQUIBS AND CAUSES IT 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 PASSENGER.

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

A29

28

D 1

26

J 9

B

29

A30

28

D 3

28

J15

29

A31

28

J 1

29

J24

29

C10

28

J 8

A

29

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1G

24

INSTRUMENT PANEL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

1J

1N

24

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

1V

24

COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)

1W

2J

20

COWL WIRE AND ENGINE ROOM J/B (ENGINE COMPARTMENT LEFT)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IG2

36

INSTRUMENT PANEL WIRE AND COWL WIRE (RIGHT SIDE OF INSTUMENT PANEL J/B)

IK3

38

ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

ED

34

SURGE TANK RH

IF

36

COWL SIDE PANEL LH

II

36

INSTRUMENT PANEL BRACE LH

SYSTEM OUTLINE

208

SRS

A

A

A

A

A

A

J15

C C C

B B B

A GRAY

J 8

B GRAY

J 9

A A

A A

A A A A A A A

J24

A

B

8

X 2

3

X

5

6

7

9 10

X X

X X

15 16

1

2

1

2

9

8

X X

X

5

X

X

X

X 11

X X

X

X

X

X

X

X

A A A

B B

A A A B B B B B

A29 YELLOW

A30 YELLOW

A31 YELLOW

C10 BROWN

J 1

GRAY

D 1

BLACK

X

X

3

4

X

X

X

X

X

X

X

X

X

3

DARK GRAY

D 3

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

(HINT : SEE PAGE 7)

A

A

A

A

209

MOON ROOF

CURRENT IS APPLIED AT ALL TIMES THROUGH THE POWER FUSE TO TERMINAL 5 OF THE POWER RELAY. WITH
THE IGNITION SW TURNED ON, THE CURRENT FLOWS THROUGH THE GAUGE FUSE 

→

 TERMINAL 7 OF THE

INTEGRATION RELAY 

→

 TERMINAL          3 

→

 TERMINAL 1 OF THE POWER RELAY 

→

 TERMINAL 2 

→

 GROUND.

AS A RESULT, POWER RELAY IS ACTIVATED AND THE CURRENT TO TERMINAL 5 OF THE POWER RELAY FLOWS
FORM TERMINAL 3 OF THE POWER RELAY TO TERMINAL 4 OF THE MOON ROOF CONTROL SW AND MOON ROOF
CONTROL RELAY.

1. SLIDE OPEN OPERATION

WHEN TURNING THE SLIDE OPEN SW “ON” WITH THE ROOF CLOSED, THE MOON ROOF CONTROL SW AND MOON
ROOF CONTROL RELAY WILL MAKE THE MOTOR ROTATE TO THE “OPEN” DIRECTION UNTIL THEY BECOME ANY OF
THE FOLLOWING CONDITIONS SUCH AS THE TERMINAL IG BECOMES “OFF” OR ANY OF THE SWS IS TURNED “ON”
OR THE TIME LIMIT (ABOUT 20 SECONDS) IS UP OR THE CURRENT GOES UP THE UPPER LIMIT 
(ABOUT 17 AMPERE).

2. SLIDE CLOSE OPERATION

WHEN TURNING THE SLIDE CLOSE SW (TILT UP) “ON” WITH THE ROOF OPEN, THE MOON ROOF CONTROL SW AND
MOON ROOF CONTROL RELAY WILL MAKE THE MOTOR ROTATE TO THE “CLOSE” DIRECTION UNTIL THEY BECOME
HALF POSITION (LS1 SW TURNS FROM “ON” TO “OFF”). UNDER THE CONDITION WITH THE ROOF HALF CLOSED,
WHEN TURNING THE SLIDE CLOSE SW (TILT UP) “ON” AGAIN, THEY WILL MAKE THE MOTOR ROTATE UNTIL THE
ROOF IS COMPLETELY CLOSED.

3. TILT UP OPERATION

WITH THE ROOF CLOSED, WHEN THE TILT UP SWITCH IS PUSHED ON, THE MOON ROOF CONTROL SW AND MOON
ROOF CONTROL RELAY DRIVES THE MOTOR IN DIRECTION OF UP (LS1 SW OFF, LS2 SW OFF).

4. TILT DOWN OPERATION

WHEN THE ROOF UP, WHEN THE TILT DOWN SWITCH (SLIDE OPEN) IS PUSHED ON, THE MOON ROOF CONTROL
SW AND MOON ROOF CONTROL RELAY DRIVES THE MOTOR IN DIRECTION OF DOWN, AND THE MOTOR STOPS AT
FULLY DOWN POSITION (LS1 SW OFF TO ON).

5. KEY OFF MOON ROOF OPERATION

WITH THE IGNITION SW TURNED FROM ON TO OFF, INTEGRATION RELAY OPERATES  AND CURRENT FLOWS FROM
THE DOOR FUSE TO TERMINAL      1 OF THE RELAY 

→

 TERMINAL       3 

→

 TERMINAL 1 OF THE POWER RELAY

→

TERMINAL 2 

→

  GROUND FOR ABOUT 43 SECONDS. THE SAME AS NORMAL OPERATION, THE CURRENT FLOWS

FROM THE POWER FUSE TO TERMINAL 5 OF THE POWER RELAY 

→

TERMINAL 3 

→

  TERMINAL 4 OF THE MOON

ROOF CONTROL SW AND MOON ROOF CONTROL RELAY. AS A RESULT, FOR ABOUT 43 SECONDS AFTER THE
IGNITION SW IS TURNED OFF, THE FUNCTIONING OF THIS RELAY MAKES IT POSSIBLE TO OPEN AND CLOSE THE
MOON ROOF. ALSO, BY OPENING THE FRONT DOOR (DOOR COURTESY SW ON)WITHIN ABOUT 43 SECONDS
AFTER TURNING THE IGNITION SW TO OFF, A SIGNAL IS INPUT TO TERMINALS 6 OR       6 OF THE INTEGRATION
RELAY. AS A RESULT, THE RELAY TURNS OFF AND OPEN OPEN CLOSE MOVEMENT OF THE MOON ROOF STOPS.

SYSTEM OUTLINE