Lexus SC300 / Lexus SC400. Manual - part 956

201

WIPER AND WASHER

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

C15

B

28

W 2

27

C16

A

28

W 5

27

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

1H

1J

20

COWL WIRE

1K

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

CODE

SEE PAGE

JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)

IE1

36

ENGINE ROOM MAIN WIRE AND COWL WIRE (R/B NO. 4)

: 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

I 7

38

COWL WIRE

202

WIPER AND WASHER

IF

M

1

2

M

1

2

3

6

5

+1

B

+S

+2

OF

F

IN

T

LO

W

/M

IS

T

HI

G

H

WA

SH

E

R

IN

T

T

IME

IE1

4

A

13

A

7

A

14

B

17

B

8

A

6

IE1

3

1K

6

1J

1

1H

16

L

R–L

L–R

L–W

W–B

G–O

L

R–L

G–O

L

L

L

L

L–R

L

L–W

W–

B

W–

B

W–B

WIPER AND WASHER SW (W/ WIPER RELAY)
[COMB. SW]

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

20A
WIPER

WIPER MOTOR

W 5

C15

, C1 6

B

A

WASHER
MOTOR

W 2

WIPER RELAY

I 7

203

WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL (A)14 OF THE WIPER AND WASHER SW, TERMINAL 2 OF
THE WASHER MOTOR AND TERMINAL 6 OF THE WIPER MOTOR THROUGH THE WIPER FUSE.

1. LOW SPEED POSITION

WITH WIPER SW TURNED TO LOW POSITION, THE CURRENT FLOWS FROM TERMINAL (A)14 OF THE WIPER AND WASHER SW 

→

TERMINAL (B)8 

→

 TERMINAL 3 OF THE WIPER MOTOR 

→

 TERMINAL 1 

→

 TO GROUND AND CAUSES TO THE WIPER MOTOR TO RUN

AT LOW SPEED.

2. HIGH SPEED POSITION

WITH WIPER SW TURNED TO HIGH POSITION, THE CURRENT FLOWS FROM TERMINAL (A)14 OF THE WIPER AND WASHER SW 

→

TERMINAL (A)7 

→

 TERMINAL 2 OF THE WIPER MOTOR 

→

 TERMINAL 1 

→

 TO GROUND AND CAUSES TO THE WIPER MOTOR TO RUN

AT HIGH SPEED.

3. INT POSITION

WITH WIPER SW TURNED TO INT POSITION, THE RELAY OPERATES AND THE CURRENT WHICH IS CONNECTED BY RELAY
FUNCTION FLOWS FROM TERMINAL (A)14 OF THE WIPER AND WASHER SW 

→

  TERMINAL (A)6 

→

 TO GROUND. THIS FLOW OF

CURRENT OPERATES THE INTERMITTENT CIRCUIT AND THE CURRENT FLOWS FROM TERMINAL (A)14 OF THE WIPER AND
WASHER SW 

→

 TERMINAL (B)8 

→

 TERMINAL 3 OF THE WIPER MOTOR 

→

 TERMINAL 1 

→

 TO GROUND AND FUNCTIONS.

THE INTERMITTENT OPERATION IS CONTROLLED BY A CONDENSER’S CHARGED AND DISCHARGED FUNCTION INSTALLED IN
RELAY AND THE INTERMITTENT TIME IS CONTROLLED BY A TIME CONTROL SW TO CHARGE THE CHARGING TIME OF THE
CONDENSER.

4. MIST POSITION

WITH WIPER SW TURNED TO MIST POSITION, THE CURRENT FLOWS FROM TERMINAL (A)14 OF THE WIPER AND WASHER SW 

→

TERMINAL (B)8 

→

 TERMINAL 3 OF THE WIPER MOTOR 

→

 TERMINAL 1 

→

 TO GROUND AND CAUSES TO THE WIPER MOTOR TO RUN

AT LOW SPEED.

5. WASHER CONTINUOUS OPERATION

WITH WASHER SW TURNED TO ON, THE CURRENT FLOWS FROM TERMINAL 2 OF THE WASHER MOTOR 

→

  TERMINAL 1 

→

TERMINAL (A)13 OF THE WIPER AND WASHER SW 

→

  TERMINAL (A)6 

→

 TO GROUND AND CAUSES TO THE WASHER MOTOR TO

RUN. AND WINDOW WASHER IS JET. THIS CAUSES THE CURRENT TO FLOW WASHER CONTINUOUS OPERATION CIRCUIT IN
TERMINAL (A)14 OF THE WIPER AND WASHER SW 

→

  TERMINAL (B)8 

→

  TERMINAL 3 OF THE WIPER MOTOR 

→

  TERMINAL 1 TO

GROUND AND FUNCTION.

C15(B), C16(A)

  WIPER AND WASHER SW [COMB. SW]

(A) 6–GROUND : 

ALWAYS CONTINUITY

(A)14–GROUND :  APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(B) 8–GROUND : 

APPROX. 12 VOLTS WITH WIPER AND WASHER SW AT LOW OR MIST POSITION
APPROX. 12 VOLTS EVERY APPROX. 1 TO 10 SECONDS INTERMITTENTLY WITH WIPER SW AT INT POSITION

(B)17–GROUND :  APPROX. 12 VOLTS WITH IGNITION SW ON UNLESS WIPER MOTOR AT STOP POSITION
(A) 7–GROUND : 

APPROX. 12 VOLTS WITH IGNITION SW ON AND AFTER WIPER SW OFF UNTIL WIPER MOTOR STOPS

W 5

  WIPER MOTOR

6–5 : CLOSED UNLESS WIPER MOTOR AT STOP POSITION

SYSTEM OUTLINE

SERVICE HINTS

15

ABBREVIATIONS

DISCONNECTION AND CONNECTION OF BOLT
TYPE CONNECTORS

For engine and ECT ECU in this vehicle, connectors are used
which require a bolt built into the connector to be screwed down to
securely connect the connector.
1.

Disconnect the connector
After completely loosening the bolt, the two parts of the
connector can be separated.

NOTICE:
Do not pull the wire harness when disconnecting the
connector.

2.

Connect the connector

NOTICE:
Before connecting the connector, always check that the
terminals are not bent or damaged.
(a)

Match the guide section of the male connector
correctly with the female connector, then press them
together.

(b)

Tighten the bolt.
Make sure the connectors are completely connected,
by tightening the bolt until there is a clearance of less
than 1 mm (0.04 in.) between the bottom of male
connector and the end of female connector.

ABBREVIATIONS

The following abbreviations are used in this manual.

A/C

= Air Conditioning

O/D

= Overdrive

ABS

= Anti–Lock Brake System

R/B

= Relay Block

A/T

= Automatic Transmission

RH

= Right–Hand

CB

= Circuit Breaker

SRS

= Supplement Restraint System

COMB.

= Combination

SW

= Switch

ECT

= Electronic Controlled Transmission

TDCL

= Total Diagnostic Communication Link

ECU

= Electronic Control Unit

TEMP.

= Temperature

EGR

= Exhaust Gas Recirculation

TRAC

= Traction Control

FL

= Fusible Link

VSV

= Vacuum Switching Valve

ISC

= Idle Speed Control

W/

= With

J/B

= Junction Block

W/O

= Without

LH

= Left-Hand

* The titles given inside the components are the names of the terminals (terminal codes) and are not treated

as being abbreviations.