Lexus SC300 / Lexus SC400. Manual - part 987

1

2

X

X

X

9

10

D 4

I15

BLACK

107

LIQUID CRYSTAL INNER REAR VIEW MIRROR

2

1F

8

1B

5

B 2

1

2

R

Y

R

R

R

W–

B

10A
DOME

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

INNER MIRROR

UNLOCK
WARNING SW
[IGNITION SW]

D 4

I15

TO FRONT PERSONAL
LIGHT

DAY/NIGHT
SHIFT SW

1F

9

1I

15

9

10

1H

13

1J

1

1F

Y

W–B

1

2

D 4

  DAY/NIGHT SHIFT SW

1 – GROUND: ALWAYS APPROX. 12 VOLTS

I15

 

 UNLOCK WARNING SW [IGNITION SW]

10–9: CLOSED WITH IGNITION KEY IN CYLINDER

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

D 4

30

I15

29

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

2

19

ENGINE COMPARTMENT LEFT

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1B

20

ENGINE ROOM MAIN WIRE

1F

20

ROOF WIRE

1H

1I

20

COWL WIRE

1J

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

IF

36

LEFT KICK PANEL

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

B 2

40

ROOF WIRE

SERVICE HINTS

196

MOON ROOF

1B

5

1I

16

1K

7

1K

13

2

1D

8

1F

8

1H

10

IP1

20

IP1

15

BZ1

4

BZ1

5

BZ1

1

IJ

IF

B 3

B 1

6

3

6

3

M

R

Y–R

W–B

W–B

W–B

W–B

W–B

L

R

L–W

B–

R

R

Y–

R

W–

B

R–

B

R–

W

R–

W

R–

W

W–

B

W–

B

B

BR

LG

W

W–

Y

W–

B

B

W–

B

W–B

B–Y

11

4

5

8

9

12

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

30A
DOOR

15A
ECU–IG

10A
DOME

T

H

EF

T

D

E

T

ER

R

E

N

T

A

N

D

DO

O

R

L

O

CK

C

O

NT

RO

L

E

CU

KEY OFF POWER
CIRCUIT

DO

O

R

O

P

E

N

DE

T

E

C

T

IO

N

S

W

L

H

DO

O

R

O

P

E

N

DE

T

E

C

T

IO

N

S

W

R

H

M

OON

R

OOF

M

OT

OR

A

N

D

L

IM

IT

S

W

NO

.

1

MOON ROOF CONTROL
RELAY

MOON ROOF
MOTOR

NO

.

2

T8

,

T9

M 2

D1

0

D1

1

M4

BA

A

8

A

2

A

20

B

8

A

16

A

13

A

12

W–

B

W–

B

W–

B

4

5

1

3

2

6

BUZZER

1

2

2

1

3

GND

MTR+

MTR–

IS1

IS2

L

W

Y

A

M 4

B

197

1D

10

1J

1

1F

6

1F

5

1I

7

BZ1

3

BZ1

8

BZ1

7

BZ1

2

BZ1

6

4

W–B

W–B

W–B

W–B

Y–R

Y–R

L–Y

L–B

L–R

L–W

V

P

V–

W

P–

L

W–

B

W–

B

W–

B

L

R

1

2

7

3

POWER MAIN
RELAY

MOON ROOF CONTROL
RELAY

OP

E

N

CL

O

S

E

DO

W

N

UP

MOON ROOF
CONTROL SW

30A
POWER

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

M 3

M 2

5

2

3

1

Q

R

S

TIMER

S

R

Q

TI

M

E

R

6

2

3

1

5

1

2

198

MOON ROOF

CURRENT IS APPLIED AT ALL TIMES THROUGH POWER FUSE TO TERMINAL 5 OF POWER MAIN RELAY AND ALSO THROUGH DOME
FUSE TO TERMINAL 12 OF MOON ROOF CONTROL RELAY. WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TERMINAL 1
OF POWER MAIN RELAY 

→

 TERMINAL 2 

→

 TO GROUND THROUGH ECU–IG FUSE. AS A RESULT, POWER MAIN RELAY IS ACTIVATED

AND THE CURRENT TO TERMINAL 5 OF POWER MAIN RELAY FLOWS FROM TERMINAL 3 OF RELAY TO TERMINAL 6 OF MOON ROOF
CONTROL RELAY.

1. SLIDE OPEN OPERATION

WHEN THE IGNITION SW IS TURNED ON AND THE MOON ROOF CONTROL SW IS PUSHED TO THE OPEN POSITION, A SIGNAL IS
INPUT FROM TERMINAL 5 OF MOON ROOF CONTROL SW TO TERMINAL 1 OF MOON ROOF CONTROL RELAY. MOON ROOF LIMIT SW
NO. 2 IS ON AT THIS TIME.

WHEN THIS OCCURS, THE RELAY IS ACTIVATED AND THE CURRENT TO TERMINAL 6 OF MOON ROOF CONTROL RELAY FLOWS
FROM TERMINAL 5 

→

 TERMINAL 3 OF MOON ROOF MOTOR 

→

 TERMINAL 1 

→

 TERMINAL 4 OF MOON ROOF CONTROL RELAY 

→

TERMINAL 11 

→

 TO GROUND AND ROTATES THE MOTOR TO OPEN THE MOON ROOF WHILE THE SW IS BEING PUSHED TO OPEN

POSITION.

2. SLIDE CLOSE OPERATION

WITH THE IGNITION SW TURNED ON, THE MOON ROOF COMPLETELY OPEN AND MOON ROOF LIMIT SW NO. 1 AND NO. 2 BOTH ON,
WHEN THE MOON ROOF CONTROL SW IS PUSHED TO THE CLOSE POSITION A SIGNAL IS INPUT FROM TERMINAL 2 OF MOON
ROOF CONTROL SW TO TERMINAL 2 OF MOON ROOF CONTROL RELAY.

WHEN THIS OCCURS, THE RELAY IS ACTIVATED AND THE CURRENT TO TERMINAL 6 OF MOON ROOF CONTROL RELAY FLOWS
FROM TERMINAL 4 

→

 TERMINAL 1 OF MOON ROOF MOTOR 

→

 TERMINAL 3 

→

 TERMINAL 5 OF MOON ROOF CONTROL RELAY 

→

TERMINAL 11 

→

 TO GROUND AND ROTATES THE MOTOR TO CLOSE THE MOON ROOF WHITE THE SW IS BEING PUSHED TO CLOSE

POSITION.

MOON ROOF LIMIT SW NO. 1 TURNS OFF (LIMIT SW NO. 2 IS ON) AND AT 200MM (7.9IN) BEFORE FULLY CLOSED POSITION, SIGNAL
IS INPUT FROM TERMINAL 2 OF LIMIT SW NO. 1 TO TERMINAL 8 OF MOON ROOF CONTROL RELAY. THIS SIGNAL ACTIVATES THE
RELAY AND STOPS CONTINUITY FROM TERMINAL 6 OF MOON ROOF CONTROL RELAY TO TERMINAL 11. AS A RESULT, THE MOON
ROOF STOPS AT THIS POSITION.

TO CLOSE THE MOON ROOF COMPLETELY, PUSHING THE MOON ROOF CONTROL SW AGAIN TO THE CLOSE SIDE CAUSES A
SIGNAL TO BE INPUT AGAIN TO TERMINAL 2 OF MOON ROOF CONTROL RELAY. THIS ACTIVATES THE RELAY AND THE MOON ROOF
WILL CLOSE AS LONG AS THE MOON ROOF CONTROL SW IS BEING PUSHED, ALLOWING THE MOON ROOF TO FULLY CLOSE.

3. TILT UP OPERATION

WHEN THE MOON ROOF CONTROL SW IS PUSHED TO TILT UP POSITION, WITH THE IGNITION SW TURNED ON AND THE MOON
ROOF COMPLETELY CLOSED (MOON ROOF LIGHT SW NO.2 IS OFF), A SIGNAL IS INPUT FROM TERMINAL 1 OF MOON ROOF
CONTROL SW TO TERMINAL 3 OF MOON ROOF CONTROL RELAY. AS A RESULT, THE RELAY IS ACTIVATED AND THE CURRENT TO
TERMINAL 6 OF RELAY FLOWS FROM TERMINAL 4 OF THE RELAY 

→

  TERMINAL 1 OF MOON ROOF MOTOR 

→

  TERMINAL 3 

→

TERMINAL 5 OF RELAY 

→

 TERMINAL 11 TO GROUND AND ROTATES THE MOTOR SO THAT TILT UP OPERATION OCCURS AS LONG

AS THE MOON ROOF CONTROL SW IS PUSHED ON THE TILT UP SIDE.

4. TILT DOWN OPERATION

WHEN THE MOON ROOF CONTROL SW IS PUSHED TO TILT DOWN POSITION, WITH THE IGNITION SW TURNED ON AND THE MOON
ROOF TILTED UP (NO. 1 AND NO. 2 MOON ROOF LIMIT SWITCHES ARE BOTH OFF), A SIGNAL IS INPUT FROM TERMINAL 3 OF MOON
ROOF CONTROL SW TO TERMINAL 7 OF MOON ROOF CONTROL RELAY.

AS A RESULT, THE RELAY IS ACTIVATED AND THE CURRENT TO TERMINAL 6 OF RELAY FLOWS FROM TERMINAL 5 OF RELAY 

→

TERMINAL 3 OF MOON ROOF MOTOR 

→

 TERMINAL 1 

→

 TERMINAL 4 OF RELAY 

→

 TERMINAL 11 

→

 TO GROUND AND ROTATES THE

MOTOR SO THAT TILT DOWN OPERATION OCCURS AS LONG AS THE MOON ROOF CONTROL SW IS PUSHED ON THE TILT DOWN
SIDE. (DURING TILT DOWN, LIMIT SW NO. 1 IS CHANGED FROM OFF TO ON.)

5. KEY OFF MOON ROOF OPERATION

WITH THE IGNITION SW TURNED FROM ON TO OFF, THE THEFT DETERRENT ECU OPERATES AND CURRENT FLOWS FROM DOOR
FUSE TO TERMINAL (A)8 OF THE ECU OR DOME FUSE TO TERMINAL (A)20 OF THE ECU 

→

  TERMINAL (B)8 

→

  TERMINAL 1 OF

POWER MAIN RELAY 

→

 TERMINAL 2 

→

 TO GROUND FOR ABOUT 60 SECONDS. THE SAME AS NORMAL OPERATION, THE CURRENT

FLOWS FROM POWER FUSE 

→

  TERMINAL 5 OF THE POWER MAIN RELAY 

→

  TERMINAL 3 

→

  TERMINAL 6 OF THE MOON ROOF

CONTROL RELAY. AS A RESULT, FOR ABOUT 60 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 DETECT SW
ON) WITHIN ABOUT 60 SECONDS AFTER TURNING THE IGNITION SW TO OFF, A SIGNAL IS INPUT TO TERMINALS (A)12 OR (A)13 OF
THEFT DETERRENT ECU. AS A RESULT, THE ECU TURNS OFF AND OPEN AND CLOSE MOVEMENT OF THE MOON ROOF STOPS.

SYSTEM OUTLINE