Lexus SC300 / Lexus SC400. Manual — part 1006

167

4. AUTO RETURN OPERATION

WHEN THE STEERING IS IN “AUTO AWAY” CONDITION AND THE IGNITION KEY IS INSERTED INTO THE IGNITION KEY CYLINDER
(UNLOCK WARNING SW ON), A SIGNAL IS INPUT TO TERMINAL UWSW OF TILT AND POWER TELESCOPIC ECU.

AS A RESULT, THE TILT AND POWER TELESCOPIC ECU OPERATES AND THE CURRENT TO TERMINAL +B OF TILT AND POWER
TELESCOPIC ECU FLOWS FROM TERMINAL TEM– OF TILT AND POWER TELESCOPIC ECU

→

TERMINAL 4 OF COMB. SW

→

TERMINAL 1 OF TELESCOPIC CONTROL MOTOR

→

TERMINAL 2

→

TERMINAL 1 OF COMB. SW

→

TERMINAL TEM+ OF TILT AND

POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, AND AT THE SAME TIME, CURRENT FLOWS FROM TERMINAL TIM– OF

TILT AND POWER TELESCOPIC ECU

→

TERMINAL 10 OF COMB. SW

→

TERMINAL 1 OF TILT CONTROL MOTOR

→

TERMINAL 2

→

TERMINAL 1 OF COMB. SW

→

TERMINAL TIM+ OF TILT AND POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, CAUSING

BOTH THE TILT CONTROL MOTOR AND TELESCOPIC CONTROL MOTOR TO ROTATE. THE MOTORS CONTINUE TO ROTATE UNTIL
THE SIGNALS INPUT FROM THE TILT POSITION SENSOR TO TERMINAL TIS OF TILT AND POWER TELESCOPIC ECU AND FROM THE
TELESCOPIC POSITION SENSOR TERMINAL TES OF TILT AND POWER TELESCOPIC ECU (SIGNALS INFORMING THE ECU OF THE
CURRENT POSITION OF THE STEERING) MATCH THE POSITION MEMORIZED BY THE ECU PRIOR TO AUTO AWAY OPERATION.

IN THIS WAY, THE STEERING POSITION IS AUTOMATICALLY RETURNED TO THE ORIGINAL POSITION.

WHEN THE IGNITION SW IS TURNED FROM OFF TO ON OR THE SHIFT LEVER IS SHIFTED TO A POSITION OTHER THAN P OR N,
AUTO OPERATION IS STOPPED.

C15

TILT AND POWER TELESCOPIC UNIT [COMB. SW]

4–6 : APPROX. 160

WITH TELESCOPIC LONG OPERATION

: APPROX. 360

WITH TILT UP OPERATION

: APPROX. 790

WITH TELESCOPIC SHORT OPERATION

: APPROX. 2.0K

WITH TILT DOWN OPERATION

8–7 : CONTINUITY WITH AUTO SW OFF
8–4 : APPROX. 5K

T 7 (D)

TELESCOPIC POSITION SENSOR

6–3 : APPROX. 5K

D10

DOOR LOCK MOTOR, DOOR UNLOCK DETECTION SW AND DOOR OPEN DETECTION SW LH

3–6GROUND :CLOSED WITH FRONT DOOR LH OPEN

D12

DRIVING POSITION MEMORY AND RETURN SW

2–3 : CLOSED WITH DRIVING POSITION MEMORY SW (NO. 1) ON
1–3 : CLOSED WITH DRIVING POSITION MEMORY SW (NO. 2) ON
4–3 : CLOSED WITH DRIVING POSITION MEMORY SW (SET) ON

I15

UNLOCK WARNING SW [IGNITION SW]

9–10: CLOSED WITH IGNITION KEY IN CYLINDER

N 1

A/T INDICATOR SW [NEUTRAL START SW]

9–1 : CLOSED WITH SHIFT LEVER AT P POSITION

T10, T11

TILT AND POWER TELESCOPIC ECU

(A)

4–GROUND

: ALWAYS

APPROX. 12 VOLTS

(A) 1–GROUND

: APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION

(B) 18–GROUND : ALWAYS

APPROX.

12

VOLTS

(A)

6–GROUND

: APPROX.

12

VOLTS WITH IGNITION SW ON AND SHIFT LEVER AT “P” RANGE

(B) 10–GROUND : CONTINUITY WITH IGNITION KEY IN CYLINDER
(A)

7–GROUND

: ALWAYS

CONTINUITY

(B)

8–GROUND

: ALWAYS

CONTINUITY

(B) 2–GROUND

: CONTINUITY WITH FRONT DOOR LH OPEN

(B) 3–GROUND

: CONTINUITY WITH DRIVING POSITION MEMORY SW (NO. 1) ON

(B) 12–GROUND : CONTINUITY WITH DRIVING POSITION MEMORY SW (NO. 2) ON
(B) 11–GROUND : CONTINUITY WITH DRIVING POSITION MEMORY SW (SET) ON
(A) 10–GROUND : APPROX.

12 VOLTS WITH TILT UP OPERATION

(A)

3–GROUND

: APPROX.

12 VOLTS WITH TILT DOWN OPERATION

(A) 2–GROUND

: APPROX. 12 VOLTS WITH TELESCOPIC SHORT OPERATION

(A) 11–GROUND : APPROX.

12 VOLTS WITH TELESCOPIC LONG OPERATION

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C17

28

N 1

27

T 7

32

D10

30

P 3

29

T10

B

29

D12

30

P11

27

T11

A

29

I15

29

R 7

32

SERVICE HINTS

168

POWER TILT AND POWER TELESCOPIC

: 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

1D

20

FRONT DOOR LH WIRE

1H

1I

20

COWL WIRE

1J

20

COWL WIRE

1K

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IF1

36

FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)

IF2

36

FRONT DOOR LH WIRE AND COWL WIRE (LEFT KICK PANEL)

IJ1

36

ENGINE WIRE AND COWL WIRE (RIGHT KICK PANEL)

IK1

36

ENGINE WIRE AND INSTRUMENT PANEL WIRE (RIGHT KICK PANEL)

BT1

40

FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)

BU1

40

FLOOR WIRE AND INSTRUMENT PANEL WIRE (LEFT KICK PANEL)

Ba1

42

FLOOR WIRE AND FRONT SEAT LH WIRE (UNDER THE FRONT LH SEAT)

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

IF

36

LEFT KICK PANEL

IH

36

INSTRUMENT PANEL BRACE LH

: SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

CODE

SEE PAGE

WIRE HARNESS WITH SPLICE POINTS

I 3

B 8

40

FLOOR MAIN WIRE

I 5

38

COWL WIRE

B 9

40

FLOOR MAIN WIRE

I 8

38

COWL WIRE

B27

42

FRONT SEAT LH WIRE

I11

170

REMOTE CONTROL MIRROR (w/ DRIVING POSITION MEMORY)

1H

3

1H

8

9

8

10

15

14

12

5

13

6

3

1

2

7

4

3

1

2

6

5

4

9

IF1

3

IF1

4

IF2

9

IF1

1

IF1

18

IF1

2

IF1

10

IP2

3

IP1

16

IP2

1

IP2

2

IP1

9

IP1

13

IP1

12

M

M

M

M

MV

MH

M+

VSRL

VCL

HSRL

E1

E1

HSRR

VCR

VSRR

M+

MH

MV

9

4

5

6

2

1

3

B–

W

R–G

W–

R

GR

BR

–

Y

BR

–

B

O

L–G

R–

G

G–

Y

B–

W

B–

W

L–

W

R–

G

G

LG

–R

LG

LG

–B

B–

W

B–

W

L–

W

R–

G

G–

Y

BR

–

Y

BR

–

B

O

L–G

R–

G

G–

Y

L–W

R–

G

G

LG

–R

LG

LG

–B

ACC

+B

MVL

MHL

M+L

VSRL

HSRL

E1

HSRR

VC

VSRR

M+R

MHR

MVR

REMOTE CONTROL MIRROR ECU

7. 5A

RADIO NO. 2

15A

ECU–B

REMOTE CONTROL MIRROR LH

REMOTE CONTROL MIRROR RH

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

I11

I11

R17

R16

R 7

, R 8

B–W

B

A

A

171

3

10

LH

RH

2

9

LH

RH

8

12

LE

F

T

RIG

H

T

UP

DO

W

N

S

E

L

E

C

T

S

W

O

PER

AT

IO

N

SW

REMOTE CONTROL MIRROR SW

IG

2

1

4

3

1

2

6

4

5

11

16

IF1

19

IF1

13

IF2

12

Ba1

4

Ba1

9

BR

–

B

W–

B

W–

B

W

W

B

Y–

B

LG

Y–

R

LG

–B

P–

B

GR

F

R

O

M

P

O

WER

S

EAT

EC

U

(SI

)

F

R

O

M

P

O

WER

S

EAT

EC

U

(SO

)

M1

M2

MRY

SI

SO

ECUE

DSW

SI

GND

SWO2

SWO1

SWO4

SWI1

SWI2

SWO3

TILT AND POWER TELESCOPIC ECU

DRIVING POSITION
MEMORY AND
RETURN SW

NO

.

1

NO

.

2

SE

T

REMOTE CONTROL MIRROR ECU

B

A

R18

T10

D12

R 7

, R8

E

B

IF1

17

IF2

20

IF1

16

IF2

8

IF1

20

IF2

19

Y–

B

L–R

Y–

R

LG

–B

P–

B

GR

A

B

IF

3

6

1D

10

1D

8

1J

1

1I

16

I 5

B 9

I 4

IF2

13

BT1

13

BT1

12

Ba1

13

BU1

6

IH

BT1

11

B27

BR–B

BR–B

BR–B

B

W

W

B

W–

B

R–

B

BR

–

B

W

B

R–

Y

R

R

R–

Y

BR

–

B

BR

R–

W

W–

B

W–

B

W

BR

–

B

BR–B

BR–B

P

P

2

8

9

1

11

12

3

3

BR–B

BR–B

BR–B

DO

O

R

O

P

E

N

DE

T

E

CT

IO

N

S

W

L

H

D1

0

(SHIELDED)

(SH

IEL

D

E

D

)

(SHIELDED)

BR

–

B

I 3