Lexus SC300 / Lexus SC400. Service manual — part 1005

161

164

POWER TILT AND POWER TELESCOPIC

1H

15

1K

13

2

1H

10

1B

5

A

A

B

B–

R

L–W

RR

30A
POWER

15A
ECU–IG

10A
DOME

4

1

18

+B

IG

ECU–B

TILT AND POWER TELESCOPIC ECU

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

B

A

, T11

T10

1

1

A

7

B

10

B

1

B

9

B

8

B

3

B

12

B

11

IF

IH

I 5

I 5

B27

BT1

12

BT1

11

BT1

13

IF2

13

IF1

19

IF1

13

IF2

12

Ba1

9

Ba1

4

1H

13

1J

1

9

10

18

17

8

3

2

1

4

B 9

1D

10

BU1

6

GND

UWSW

SO

SI

ECU–E

M1

M2

MRY

BR–B

W–B

B

W

Y

W–

B

W–

B

BR

–

B

BR

–

B

BR

–

B

B

W

B

W

BR

–

B

BR

–

B

BR

–

B

BR

BR

–

B

P

R

R–

Y

R–

Y

R

P

BR

–

B

W–

B

W–B

SSR–

SO

SI

UN

L

O

C

K

W

A

RN

ING

S

W

[IG

N

IT

IO

N

S

W

]

PO

WER

S

EAT

E

C

U

DRIVING POSITION MEMORY
AND RETURN SW

(SHIELDED)

(SH

IE

L

D

ED

)

(SH

IE

L

D

ED

)

NO

.

1

NO

.

2

SET

P1

1

I15

D12

Ba1

13

2

B 8

I 3

BR

–

B

W

BR

–

B

16

SI

REMOTE CONTROL
MIRROR ECU

R 7

W

165

1H

12

P

R

N

D

2

L

1

4

6

5

7

8

9

B

B

B

B

B

A

A

B

A

A

A

2

1

M

2

1

M

2

1

VC

MSW

E

ASW

TIS

TIM+

TIM–

VC

TES

E

TEM+

TEM–

Y

BR

R–W

GR

R–

B

L

G–

W

G

W

R–

W

BR

R–

W

BR

R–

W

V–

Y

BR

V–

W

P–

L

R–

B

R–

L

Y–

R

L–B

L–Y

6

17

16

5

4

7

10

3

6

2

11

VC

MSW

E1

ASW

TIS

TIM+

TIM–

TES

TEM+

TEM–

P

A/T INDICATOR SW
[NEUTRAL START SW AND

BACK–UP LIGHT SW]

TILT AND POWER TELESCOPIC ECU

T

EL

ESC

O

PI

C

C

O

NT

RO

L

M

O

T

O

R

TELESCOPIC POSITION
SENSOR

T

IL

T

CO

NT

RO

L

MO

T

O

R

T

IL

T

PO

SI

T

IO

N

SEN

SO

R

AUTO SW

MANUAL SW

TILT
DOWN

TELESCO
SHORT

TILT
UP

TELESCO
LONG

T 7

B

A

, T11

T10

TILT AND POWER TELESCOPIC UNIT [COMB. SW]

C17

TELESCOPIC POSITION SENSOR

N 1

10A
GAUGE

Y

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

GR

IK1

12

IJ1

10

BT1

18

B

2

1I

16

1D

8

6

3

D

OOR

OP

E

N

DE

T

E

C

T

IO

N

S

W

L

H

GR

GR

Y

DSW

W–B

R–

B

R–

W

D1

0

4

6

8

7

5

1

10

6

5

3

1

4

R

W

B

L

R

Y

W

B

B

B

P–

B

B–

W

G–

W

R

G

3

BU1

7

1

(A/

T

)

PARKING
BRAKE SW

B

(M/T)

I11

:

A

/T

I8

:M

/T

I1

1

:

A

/T

I8:

M

/T

P 3

166

POWER TILT AND POWER TELESCOPIC

THIS SYSTEM OPERATES WITH BOTH THE TILT FUNCTION AND TELESCOPIC FUNCTION DRIVEN AUTOMATICALLY BY THE MOTOR
AND CONTROLLED BY THE ECU. THE STEERING CAN BE ADJUSTED STEPLESSLY FORWARD AND BACK, AND UP AND DOWN, TO
PROVIDE THE MOST SUITABLE STEERING POSITION FOR EASY DRIVING, WITH AUTOMATIC MOVEMENT OF THE STEERING TO A
POSITION WHICH FACILITATES GETTING IN AND OUT OF THE VEHICLE.

THE DRIVER CAN HAVE THE MOST APPROPRIATE DRIVING POSITION MEMORIZED BY OPERATING THE POWER SEAT AND REMOTE
CONTROL MIRROR TOGETHER WITH THE TILT AND POWER TELESCOPIC STEERING.

CURRENT IS ALWAYS APPLIED THROUGH THE POWER FUSE TO TERMINAL +B OF THE TILT AND POWER TELESCOPIC ECU AND
THROUGH THE DOME FUSE TO TERMINAL BATT OF TILT AND POWER TELESCOPIC ECU.

WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS FROM ECU–IG FUSE TO TERMINAL IG AND FROM GAUGE FUSE TO
TERMINAL 9 OF A/T INDICATOR SW.

1. MANUAL TILT OPERATION

WHEN 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. IF THE MANUAL SW IS PUSHED TO THE “TILT UP” SIDE, CURRENT
FLOWS FROM TERMINAL VC OF TILT AND POWER TELESCOPIC ECU TO TERMINAL MSW OF TILT AND POWER TELESCOPIC ECU
PASSING THROUGH THE MANUAL SW. (THE ECU DETECTS THE MANUAL SW POSITION BY THE VOLUME OF CURRENT.)

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

→

TERMINAL 1 OF COMB. SW

→

TERMINAL 2 OF TILT CONTROL MOTOR

→

TERMINAL 1

→

TERMINAL 10 OF COMB.

SW

→

TERMINAL TIM– OF TILT AND POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, AND THE TILT UP FUNCTION

OPERATES AS LONG AS THE MANUAL SW IS PUSHED TO THE “TILT UP” SIDE.

FOR “TILT DOWN” OPERATION, WHEN THE MANUAL SW IS PUSHED TO THE DOWN SIDE, THE CURRENT FLOWING FROM ECU TO
MOTOR FLOWS TO 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, SO THE

MOTOR ROTATES IN THE REVERSE DIRECTION TO TILT UP OPERATION, AND TILT DOWN OPERATION OCCURS ONLY WHILE THE
MANUAL SW IS BEING PUSHED.

2. MANUAL TELESCOPIC OPERATION

WHEN THE IGNITION KEY IS INSERTED INTO THE IGNITION KEY CYLINDER (UNLOCK WARNING SW ON), A SIGNAL IS INPUT TO
TERMINAL UWSW OF TILT AND TELESCOPIC ECU. WHEN THE MANUAL SW IS PUSHED TOWARD “TELESCOPIC SHORT” SIDE,
CURRENT FLOWS FROM TERMINAL VC OF TILT AND POWER TELESCOPIC ECU TO TERMINAL MSW OF TILT AND POWER
TELESCOPIC ECU THROUGH THE MANUAL SW.

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 1 OF COMB. SW

→

TERMINAL 2 OF TELESCOPIC CONTROL MOTOR

→

TERMINAL 1

→

TERMINAL 4 OF COMB. SW

→

TERMINAL TEM– OF TILT AND

POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, AND “TELESCOPIC SHORT” OPERATION OCCURS AS LONG AS THE

MANUAL SW IS PUSHED THE TO “TELESCOPIC SHORT” SIDE.

FOR “TELESCOPIC LONG” OPERATION, WHEN THE MANUAL SW IS PUSHED TO THE TELESCOPIC LONG SIDE, CURRENT FLOWING
FROM TILT AND POWER TELESCOPIC ECU TO THE MOTOR FLOWS THROUGH 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.

AS A RESULT, THE MOTOR ROTATES IN REVERSE TO THE TELESCOPIC SHORT MODE AND TELESCOPIC LONG OPERATION
OCCURS AS LONG AS THE MANUAL SW IS PUSHED TO THE “TELESCOPIC LONG” SIDE.

3. AUTO AWAY OPERATION

WHEN THE IGNITION SW IS TURNED FROM ON TO OFF, THE CURRENT STOPS FLOWING FROM ECU–IG TO TERMINAL IG OF TILT
AND POWER TELESCOPIC ECU AND IS INPUT AS A SIGNAL THAT THE IGNITION SW IS OFF. WHEN THE AUTO SW IS TURNED ON, AN
“AUTO SW ON” SIGNAL IS INPUT TO TERMINAL ASW OF TILT AND POWER TELESCOPIC ECU.

IF THE IGNITION KEY IS REMOVED FROM THE IGNITION KEY CYLINDER (UNLOCK WARNING SW OFF) AT THIS TIME, A SIGNAL IS
INPUT FROM TERMINAL UWSW OF TILT AND POWER TELESCOPIC ECU. ALSO, THE TILT POSITION SENSOR (COMB. SW) INPUTS
INTO TERMINAL TIS OF THE TILT AND TELESCOPIC ECU A SIGNAL OF THE STEERING TILT POSITION JUST BEFORE THE IGNITION
SW (FOR UNLOCK WARNING) IS TURNED FROM ON TO OFF.

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

→

TERMINAL 1 OF COMB. SW

→

TERMINAL 2

OF TILT CONTROL MOTOR

→

TERMINAL 1

→

TERMINAL 10 OF COMB. SW

→

TERMINAL TIM– OF TILT AND POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, CAUSING THE MOTOR TO ROTATE SO THAT “TILT UP” OPERATION OCCURS AUTOMATICALLY.

AT THE SAME TIME, THE CURRENT FROM TERMINAL +B OF TILT AND POWER TELESCOPIC ECU TO TERMINAL TEM+ FLOWS FROM
TERMINAL 1 OF COMB. SW

→

TERMINAL 2 OF TELESCOPIC CONTROL MOTOR

→

TERMINAL 1

→

TERMINAL 4 OF COMB. SW

→

TERMINAL TEM– OF TILT AND POWER TELESCOPIC ECU

→

TERMINAL GND2

→

GROUND, CAUSING THE MOTOR TO ROTATE SO

THAT TELESCOPIC SHORT OPERATION OCCURS ON AUTO AND WITH TILT UP OPERATION OCCURRING SIMULTANEOUSLY ON
AUTO, AUTO AWAY OPERATION OCCURS.

SYSTEM OUTLINE