Lexus ES300 (1997 year). Service manual — part 622

2

2

5

2

2

2

EC

2

EB2

7

B

C

A

A

IG1

4

1J

7

1J

8

B

E

B

E

A

D

A

D

4

R

R–B

R–Y

W–R

W–B

W–B

R–W

R

R–B

R–Y

W–B

W–B

W–B

W–B

R–

Y

R–

B

R–

W

R

R–

W

R–

W

W–

B

W–

B

R–

Y

R

–

B

R–

B

R–

B

R–

B

COMBINATION

SW

C11

R

W–

B

16

7

1

3

JUNCTION

CONNECTOR

B

J18

, J19

A

JUNCTION

CONNECTOR

B

J 8

, J 9

A

IN

T

E

G

R

A

T

IO

N

RE

LA

Y

DRL

N

O

. 3

RE

L

A

Y

JUNCT

IO

N

CO

NN

E

C

T

O

R

B

J2

0

, J

2

1

A

R–

W

A

R–

W

IG1

3

R–W

B

3

B

4

I1

5

B

II

3

5

–W

JUNCTION

CONNECTOR

J15

JU

N

C

T

IO

N

CO

NN

E

C

T

O

J10

D

D

H

IG

H

BEAM

INDI

CA

T

O

R L

IG

H

T

[C

O

M

B

.

M

E

T

E

R

]

C 9

OFF

TAIL

HEAD

LOW

HIGH

FLASH

LI

G

H

T

CO

N

T

RO

L

S

W

D

IMME

R

S

W

13

8

A

A

A

A

B

A

84

FROM POWER SOURCE SYSTEM (SEE PAGE 56)

EB2

8

EB2

6

B

B

A

B

R–

B

R

R

R–

L

R

R–

L

R–

W–

R–

W

R–

W

R–

W

Y

Y

Y

JUNCTION
CONNECTOR

B

J18

, J19

A

JUNCTION

B

J20

, J21

A

ION

ECTOR

PARKIN
BRAKE

P 3

L

R

R–B

R–Y

W–B

W–B

R–W

F

R

O

M

BR

AKE

W

A

R

N

IN

G

L

IGH

T

[

C

OM

B

. M

E

T

E

R

]

W–

B

1

2

1

A

II

J15
JUNCTION
CONNECTOR

D

D

1

JUNCT
CONN

J28

GENERATOR

G 2

G

SW

BR

A

K

E F

L

U

ID

L

EVE

W

A

RNI

NG

S

W

B 1

L

Y

B

8

6

4

10

5

DAYTIME RUNNING LIGHT
RELAY (MAIN)

D 5

2

9

7

1

HI

E

PKB

BRK

CHG–

IG

+B

DRL

H

B

B

JU

N

C

T

ION

C

O

NNE

CT

O

R

J 2

B

7. 5A
DOME

2J

12

10A
GAUGE

1J

1

1W

1

1V

7

B

A

A

C

A

C

CONNECTOR

85

HEADLIGHT(CANADA)

86

CURRENT FROM THE BATTERY IS ALWAYS FLOWING FROM THE FL MAIN

→

MAIN FUSE

→

HEAD RELAY (COIL SIDE)

→

TERMINAL 2 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN) AND TEINRMINAL 8 OF THE DIMMER SW, HEAD RELAY (COIL SIDE)

→

TERMINAL B 3 OF THE INTEGRATION RELAY

→

TERMINAL B 4

→

TERMINAL 13 OF THE LIGHT CONTROL SW, FL MAIN

→

MAIN FUSE

→

DRL NO.2 RELAY (COIL SIDE)

→

TERMINAL 9 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN).

1. DAYTIME RUNNING LIGHT OPERATION

WHEN THE ENGINE IS STARTED, VOLTAGE GENERATED AT TERMINAL ‘L’ OF THE GENERATOR IS APPLIED TO TERMINAL 5 OF
THE DAYTIME RUNNING LIGHT RELAY (MAIN).
IF THE PARKING BRAKE PEDAL IS DEPRESSED (PARKING BRAKE SW ON) AT THIS TIME, THE RELAY IS NOT ENERGIZED, SO
THE DAYTIME RUNNING LIGHT SYSTEM DOES NOT OPERATE. IF THE PARKING PEDAL LEVER IS RELEASED (PARKING BRAKE
SW OFF), THE SIGNAL IS INPUT TO TERMINAL 4 OF THE RELAY. THIS ACTIVATES THE RELAY AND CURRENT FROM MAIN FUSE
FLOWS TO DRL NO. 2 RELAY (POINT SIDE)

→

HEAD (LH) FUSE

→

TERMINAL 1 OF THE HEADLIGHT LH (LH)

→

TERMINAL 2

→

TERMINAL 2 OF THE HEADLIGHT RH (HI)

→

TERMINAL 1

→

TERMINAL 3 OF THE DRL NO.3 RELAY

→

TERMINAL 4

→

TO

GROUND, CAUSING THE HEADLIGHTS TO LIGHT UP DIMMER THAN NORMAL BRIGHTNESS.
THIS IS HOW THE DAYTIME RUNNING LIGHT SYSTEM OPERATES ONCE THE DAYTIME RUNNING LIGHT SYSTEM OPERATES AND
THE HEADLIGHTS HAVE LIGHT UP, THE HEADLIGHTS REMAIN ON EVEN IF THE PARKING BRAKE PEDAL IS DEPRESSED
(PARKING BRAKE SW ON).
EVEN IF THE ENGINE STALLS WITH THE IGNITION SW ON AND THERE IS NO VOLTAGE FROM TERMINAL ‘L’ OF THE
GENERATOR, THE HEADLIGHTS REMAIN ON. IF THE IGNITION SW IS THEN TURNED OFF, HEADLIGHT ARE TURNED OFF.
IF THE ENGINE IS STARTED WHILE THE PARKING BRAKE PEDAL IS RELEASED (PARKING BRAKE SW OFF), THE DAYTIME
RUNNING LIGHT SYSTEM OPERATES AND THE HEADLIGHTS LIGHT UP AS THE ENGINE STARTS.

2. HEADLIGHT OPERATION

WHEN THE LIGHT CONTROL SW AT THE HEAD POSITION
WHEN THE LIGHT CONTROL SW IS SET TO HEAD POSITION, THE CURRENT FLOWING TO THE HEAD RELAY (COIL SIDE)
FLOWS TO TERMINAL B 3 OF THE INTEGRATION RELAY

→

TERMINAL B 4

→

TERMINAL 13 OF THE LIGHT CONTROL SW

→

TERMINAL 16

→

GROUND, TURNING THE HEAD RELAY ON.

THIS CAUSES THE CURRENT FLOWING TO THE HEAD RELAY (POINT SIDE)

→

DRL NO. 2 FUSE

→

DRL NO.3 RELAY (COIL

SIDE) AND DRL NO.4 RELAY (COIL SIDE)

→

GROUND, TURNING THE DRL NO.3 AND NO.4 RELAY ON. ALSO, CURRENT FROM

THE HEAD RELAY (POINT SIDE) TO HEAD (LWR) FUSES

→

TERMINAL 2 OF THE HEADLIGHT (LO)

→

TERMINAL 3

→

GROUND,

SO THE HEADLIGHTS (LO SIDE) LIGHT UP.

DIMMER SW AT FLASH POSITION
WHEN THE DIMMER SW IS SET TO FLASH POSITION, CURRENT FLOWS FROM HEAD RELAY (COIL SIDE)

→

TERMINAL 8 OF

THE DIMMER SW

→

TERMINAL 16

→

GROUND, TURNING THE HEAD RELAY ON. AT THE SAME TIME, SIGNALS ARE OUTPUT

FROM TERMINAL 7 AND TERMINAL 8 OF THE DIMMER SW TO TERMINAL 8 AND TERMINAL 2 OF THE DAYTIME RUNNING LIGHT
RELAY (MAIN), ACTIVATING THE DAYTIME RUNNING LIGHT RELAY (MAIN) AND ALSO THE DRL NO.2 RELAY. WHEN THE HEAD
RELAY AND DAYTIME RUNNING LIGHT RELAY (MAIN) ARE ACTIVATED, THE HEADLIGHTS (LO AND HI) THEN LIGHT UP.

DIMMER SW AT HIGH POSITION
WHEN THE LIGHT CONTROL SW IS SET TO HEAD POSITION, A SIGNAL IS OUTPUT FROM TERMINAL 13 OF THE LIGHT
CONTROL SW

→

TERMINAL B 4 OF THE INTEGRATION RELAY

→

TERMINAL B 3

→

TERMINAL 2 OF THE DAYTIME RUNNING

LIGHT RELAY (MAIN). WHEN DIMMER SW IS SET TO HIGH POSITION, A SIGNAL IS OUTPUT FROM TERMINAL 7 OF THE DIMMER
SW TO TERMINAL 8 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN). THESE SIGNALS ACTIVATE DRL NO.2 RELAY, SO
CURRENT FLOWS FROM DRL NO.2 RELAY (POINT SIDE)

→

HEAD (LH) FUSE

→

TERMINAL 1 OF THE HEADLIGHT LH (HI)

→

TERMINAL 2

→

DRL NO.4 RELAY (POINT SIDE)

→

GROUND, AND CURRENT ALSO SIMULTANEOUSLY FLOWS FROM HEAD (RH)

FUSE

→

DRL NO.3 RELAY (POINT SIDE)

→

TERMINAL 1 OF THE HEADLIGHT RH (HI)

→

TERMINAL 2

→

DRL NO.4 RELAY (POINT

SIDE), CAUSING THE HEADLIGHTS (HI SIDE) TO LIGHT UP.

SYSTEM OUTLINE

D 5

DAYTIME RUNNING LIGHT RELAY (MAIN)

1–GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
7–GROUND : ALWAYS APPROX. 12 VOLTS
4–GROUND : CONTINUITY WITH THE PARKING BRAKE PEDAL DEPRESSED (PARKING BRAKE SW ON)
5–GROUND : ALWAYS CONTINUITY

SERVICE HINTS

87

HEADLIGHT(CANADA)

: PARTS LOCATION

CODE

SEE PAGE

CODE

SEE PAGE

CODE

SEE PAGE

B 1

26

H 2

26

J15

29

C 9

28

H 3

26

J18

A

29

C11

28

H 4

26

J19

B

29

D 5

28

I15

B

28

J20

A

29

F 6

A

26

J 2

29

J21

B

29

F 8

C

26

J 8

A

29

J28

29

G 2

26

J 9

B

29

P 3

29

H 1

26

J10

29

: RELAY BLOCKS

CODE

SEE PAGE

RELAY BLOCKS (RELAY BLOCK LOCATION)

2

23

ENGINE ROOM NO.2 R/B (ENGINE COMPARTMENT LEFT)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE

SEE PAGE

JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)

IJ

1V

24

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

1W

(

)

2B

2C

20

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

2G

(

)

2J

20

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

2K

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)

EB2

34

COWL WIRE AND ENGINE ROOM MAIN WIRE (UNDER THE ENGINE ROOM J/B)

IG1

36

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

: GROUND POINTS

CODE

SEE PAGE

GROUND POINTS LOCATION

EA

34

RIGHT RADIATOR SIDE SUPPORT

EC

34

LEFT RADIATOR SIDE SUPPORT

II

36

INSTRUMENT PANEL BRACE LH