Sit electrico

4-3

GROUP 2 ELECTRICAL CIRCUIT (up to #1000)

21074EC01

¡⁄ Machine serial no : up to #0179

4-3-1

21074EC01A

¡⁄ Machine serial no : #0180~#1000

4 -4

1. POWER CIRCUIT (up to #0179)The negative terminal of battery is grounded to the machine chassis through master switch.When the start switch is in the OFF position, the current flows from the positive battery terminal as shownbelow.

OPERATING FLOWBattery Battery relay Reset button[CS-61]

Fuse box [No.1] I/conn [CN-8(12)] Start switch [CS-2(1)]Power relay [CR-35(30)]

Fuse box [No.2] I/conn [CN-10(6)] Room lamp [CL-1(2)] Door switch[CS-1]Cassette radio [CN-27(11)]

Fuse box [No.3] I/conn [CN-11(4)] AC&Heater controller [CN-116(3,4)]Fuse box [No.4] I/conn [CN - 5(4)] I/conn [CN -17(5)] Wiper motor Controller

[CN-141(7)]Wiper motor [CN-21(4)]

Fuse box [No.5] CPU controller [CN-50(7)]Fuse box [No.6] I/conn [CN-11(5)] Relay(Hi, M2)

Engine Start switch Check point Voltage

1)

¡ GND : Ground

OFF OFF

- GND (Battery 1 EA)



- GND (Reset button)

10~12.5V

20~25V

20~25V

20~25V

2) CHECK POINT

I/conn : Intermediate connector

4 -5

POWER CIRCUIT(up to #0179)

21074EL03

4 -5-1

1. POWER CIRCUIT (from #0180 to #1000)The negative terminal of battery is grounded to the machine chassis through master switch.When the start switch is in the OFF position, the current flows from the positive battery terminal asshown below.

OPERATING FLOWBattery Battery relay Fusible link ¡†CN-60¡‡

Fuse box ¡†No.1¡‡ l/conn¡†CN-8(12)¡‡ Start switch ¡†CS-2(1)¡‡Power relay ¡†CR-35(30)]

Fuse box ¡†No.2¡‡ I/conn¡†CN-10(6)¡‡ Room lamp ¡†CL-1(2)¡‡ Door switch ¡†CS-1¡‡Cassette radio ¡†CN-27(11)¡‡

Fuse box ¡†No.3¡‡ l/conn¡†CN-11(4)¡‡ AC & Heater controller ¡†CN -116(3, 4)¡‡Fuse box ¡†No.4¡‡ I/conn¡†CN - 5(4)¡‡ I/conn¡†CN -17(5)¡‡ Wiper motor controller

¡†CN-141(7)¡‡Wiper motor ¡†CN-21(4)¡‡

Fuse box ¡†No.5¡‡ CPU controller ¡†CN-50(7)¡‡Fuse box ¡†No.6¡‡ I/conn¡†CN-11(5)¡‡ Relay(Hi, M2)

¡ I/conn : Intermediate connector

CHECK POINT


1)

2)

¡ GND : Ground

OFF OFF

¤ - GND (Battery 1EA)

¤Ł- GND (Battery 2EA)

¤Ø- GND (Battery 2EA)

¤Œ - GND (Fusible link)

10~12.5V

20~25V

20~25V

20~25V

4 - 5-2

POWER CIRCUIT (from #0180 to #1000)

21074EL03A

2. STARTING CIRCUIT(up to #1000)

OPERATING FLOWBattery(+) terminal Battery relay[CR-1] Reset button[CS-61] Fuse box [No.1]

I/conn [CN-8(12)] Start key [CS-2(1)]

¡ Start switch : ONStart switch ON [CS-2(2)] I/conn [CN-8(11)] Diode[DO-2]Battery relay [CR-1]:Battery relay operating(All power is supplied with the electric component)Start switch ON [CS-2(3)] I/conn [CN-8(10)] Power relay [CR-35(86)¡ (87)]

Fuse box [No.12] I/conn [CN-1(5)] Fuel cut-off [CN-79(1)]

¡ Start switch : START Start switch START[CS-2(5)] I/conn[CN-8(9)] Safety relay [CR-5(86) ¡ (30)]

I/conn [CN-3(4)] Start relay [CR-23]I/conn [CN-1(4)] Fuel cut off [CN-79(2)]

4 -6


¤ -GND (Battery)

¤ Ł -GND (Start key)

¤ Ø -GND (Battery relay M4)

Operating Start ¤ Œ -GND (Starter B ) 20 ~ 25V

¤ º -GND (Starter M)

¤ -GND (Start relay)

¤ -GND (Battery relay M8)

1)

2) CHECK POINT

¡ GND : Ground

4 -7

STARTING CIRCUIT(up to #1000)

21074EL05

3. CHARGING CIRCUIT(up to #1000)When the starter is activated and the engine is started, the operator releases the key switch to the ONposition.Charging current generated by operating alternator flows into the battery through the Batteryrelay(CR-1).The current also flows from alternator to each electrical component and controller through the fusebox.

OPERATING FLOW

Warning flowAlternator¡ I¡–terminal I/conn ¡†CN-3(6)¡‡ CPU Controller [CN-51(9)]Cluster warning lamp (Via serial interface)

Charging flowAlternator "B+" terminal Battery relay(M8) Battery(+) terminal

Reset button[CS-61] Fuse box

4 -8


¤ - GND (Battery voltage)

¤Ł- GND (Battery relay)

ON ON ¤Ø- GND (Alternator B¡qterminal) 20~27V

¤Œ- GND (Alternator I terminal)

¤º- GND (CPU)

1)

2)

(1)

(2)

CHECK POINT

¡ GND : Ground

4 -9

CHARGINGING CIRCUIT(up to #1000)

21074EL06

4 -10

4. HEAD LAMP CIRCUIT(up to #1000)

OPERATING FLOWFuse box (No.14) I/conn [CN-7(7)] Switch panel [CN-116(9)]

¡ When lamp switch ONSwitch panel [CN-116(1)] I/conn [CN-7(1)]

I/conn [CN-10(2)] Cassette radio illumination [CN-27(7)]I/conn [CN-11(8)] AC & Heater controller illumination [CN-116(5)]Head lamp [CL-4(2)] : Head lamp ONI/conn[CN-6(8)] Cigarlight [CL-2]

Engine Key switch Check point Voltage

¤ - GND (Fuse box)

¤Ł- GND (Switch power input)

¤Ø- GND (Switch power output)

1)

2) CHECK POINT

¡ GND : Ground

STOP ON 20~25V

4 -11

HEAD LAMP CIRCUIT(up to #1000)

21074EL07

4 -12

5. WORK LAMP CIRCUIT(up to #1000)

OPERATING FLOWFuse box (No.15) I/conn [CN-7(8)] Switch panel [CN-116(10,11)]

¡ When work lamp switch ONWork lamp switch ON [CN-116(2,3)] I/conn [CN-7(2)] I/conn [CN-12(1)]

Work lamp ON [CL-5(2), CL-6(2)]

Engine Key switch Check point Voltage

¤ - GND (Fuse box)

¤Ł- GND (Switch power input)

¤Ø- GND (Switch power output)

¤Œ- GND (Work lamp)

1)

2) CHECK POINT

¡ GND : Ground

STOP ON 20~25V

4 -13

WORK LAMP CIRCUIT(up to #1000)

21074EL08

4 -14

6. CAB LAMP CIRCUIT(up to #1000)

OPERATING FLOWFuse box (No.16) I/conn ¡†CN-7(12)¡‡ Switch panel [CN-116(16,17)]

¡ When Lamp switch ONLamp switch ON [CN-116(7, 8)] I/conn [CN-7(6)] I/conn [CN-10(11)] Cab light ON [CL-8(2), CL-9(2)]

1)

2) CHECK POINT

Engine Start switch VoltageCheck point

- GND (Fuse box)

- GND (Switch power input)

- GND (Switch power output)

- GND (Cab lamp)

STOP ON 20 ~ 25V

GND : Ground

4 -15

2

1

2

1

CABIN LIGHT

CL-9

CL-8

AC

& H

EA

TE

R

CP

U5

5A

27

10A

26

10A

25

10A

24

5A

23

10A

22

5A

21

10A

20

10A

19

10A

18

20A

17

5A

16

10A

15

10A

14

5A

13

20A

12

20A

11

5A

10

5A

9

10A

8

5A

7

10A

6

20A

4

10A

3

5A

2

5A

1

20A

FUSE BOX

CN

-46

SP

AR

E

FU

EL

FIL

LER

P/P

SO

LEN

OID

3

SA

FE

TY

SO

L

SO

LEN

OID

1

TR

AV

EL

ET

HE

R(P

RE

-HE

AT

)

CIG

AR

LIG

HT

ER

HO

RN

AC

& H

EA

TE

R

BE

AC

ON

LA

MP

CA

BIN

LA

MP

WO

RK

LA

MP

HE

AD

LA

MP

WIP

ER

MO

TO

R

SW

ITC

H P

AN

EL

CO

NV

ER

TO

R

CP

U

FU

EL

CU

T-O

FF

CLU

ST

ER

CA

SS

ET

TE

RA

DIO

WIP

ER

AC

& H

EA

TE

R

RO

OM

LA

MP

ST

AR

T K

EY

CN-7

CA

BIN

LIG

HT

24V

CA

BIN

LIG

HT

24V

INT

. SIG

TR

AV

EL

ALA

RM

GN

D

WA

SH

ER

SIG

WO

RK

LIG

HT

24V

WO

RK

LIG

HT

24V

HE

AD

LIH

GT

24V

CA

BIN

LIG

HT

OU

T

CA

BIN

LIG

HT

OU

T

PO

WE

R 2

4V

PR

E-H

EA

T

WIP

ER

MO

TO

R D

RIV

E

WO

RK

LIG

HT

OU

T

WO

RK

LIG

HT

OU

T

HE

AD

LIG

HT

OU

T

1716151413121110

987654321

CN

-116

SWITCH PANEL

12

11

10

9

8

7

6

5

4

3

2

1

12

11

10

9

8

CN-10

7

6

5

4

3

2

1

1

23

4

R

R

R

OROR

ROR

OROR

OR

OR

CAB LAMP CIRCUIT(up to #1000)

21074EL09

4 -16

7. BEACON LAMP CIRCUIT(up to #1000)

OPERATING FLOWFuse box (No.17) I/conn [CN-8(3)] Beacon lamp switch [CN-23(6)]

¡ When lamp switch ONBeacon lamp switch ON [CS-23(2)] Switch lndicator lamp ON [CS-23(9)]

l/conn [CN-8(4)] l/conn [CN-10(10)]Beacon lamp ON [CL-7]

CHECK POINT

1)

2)

¡ GND : Ground


STOP ON

¤ - GND(Fuse box)

¤Ł- GND(Switch power input)

¤Ø- GND(Switch power output)

¤Œ- GND(Beacon lamp)

20~25V

4 -17

ST

AR

T K

EY

RO

OM

LA

MP

AC

& H

EA

TE

R

WIP

ER

+

CA

SS

ET

TE

RA

DIO

CLU

ST

ER

CP

U

CO

NV

ER

TO

R

SW

ITC

H P

AN

EL

FU

EL

CU

T-O

FF

WIP

ER

MO

TO

R

HE

AD

LA

MP

WO

RK

LA

MP

CA

B L

AM

P

BE

AC

ON

LA

MP

AC

& H

EA

TE

R

HO

RN

CIG

AR

LIG

HT

ER

ET

HE

R(P

RE

-HE

AT

)

TR

AV

EL

SO

LEN

OID

1

SO

LEN

OID

3

FU

EL

FIL

LER

PU

MP

SP

AR

E

CN

-46

FU

SE

BO

X

20A

1

5A2

5A3

10A

4

20A

6

10A

7

5A8

10A

9

5A10

5A11

20A

12

20A

13

5A14

10A

15

10A

16

5A17

20A

18

10A

19

10A

20

10A

21

5A22

10A

23

5A24

10A

25

10A

26

10A

27

CP

U B

+5A

5

20A

28

SP

AR

E

SA

FE

TY

SO

LEN

OID

AC

BLO

WE

R

4

1

1 2 3 4 5 6 7

Y

CN

-8

8 9 10 11 121 2 3 4 5 6 7

CN

-10

8 9 10 11 12

Y

B

G

Y

G

CS-23

BEACON LAMP SW

15

9 10

1

2

3

4

5

6

7

8

9

10

26

8

7

GG

BEACON LAMP

G

B

CL-7

M

2

3

6

1 2 3 4 5 6 7

OR

CN

-7

8 9 10 11 12

SWITCH PANEL

CN

-116 1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17

HE

AD

LIG

HT

OU

T

WO

RK

LIG

HT

OU

T

WO

RK

LIG

HT

OU

T

WIP

ER

MO

TO

R D

RIV

E

PR

E-H

EA

T

PO

WE

R 2

4V

CA

BIN

LIG

HT

OU

T

CA

BIN

LIG

HT

OU

T

HE

AD

LIH

GT

24V

WO

RK

LIG

HT

24V

WO

RK

LIG

HT

24V

WA

SH

ER

SIG

GN

D

TR

AV

EL

ALA

RM

INT

. SIG

CA

BIN

LIG

HT

24V

CA

BIN

LIG

HT

24V

R

OR

OR

8

7

RR

R

OR

OR

B

B

OR

1

2

1

2

CAB LIGHT

CAB LIGHT

CL-8

CL-9

5

BEACON LAMP CIRCUIT(up to #1000)

29074EL08

4 -18

8. WIPER AND WASHER CIRCUIT(up to #1000)

OPERATING FLOW

Key switch ONFuse box (No.11) I/conn [CN-7(5)] Switch panel [CN-116(6)]Fuse box (No.4) I/conn [CN-5(4)] I/conn [CN-17(5)] Wiper motor controller [CN-141(7)]

Wiper motor [CN-21(4)]Fuse box (No.13) I/conn [CN-6(5)] l/conn [CN-17(4)] Wiper motor controller [CN-141(6)]

Washer pump [CN-22(2)]

Wipe switch ON : 1st step(Intermittent)Wiper switch ON [CN-116(15)] I/conn[CN-9(4)] I/conn[CN-17(8)]Wiper motor controller [CN-141(10) ¡ (3)] Wiper motor intermittently operating [CN-21(6)]

Wiper switch ON : 2nd step(Low speed)Wiper switch ON [CN-116(4)] I/conn [CN-7(3)] I/conn [CN-6(9)] I/conn[CN-17(2)]Wiper motor controller [CN-141(2) ¡ (4)] Wiper motor operating [CN-21(2)]

Washer switch ON Washer switch ON [CN-116(12)] I/conn [CN-7(9)] I/conn [CN-5(1)] I/conn [CN-17(7)]

Wiper motor controller [CN-141(9) ¡ (8)] I/conn [CN-17(6)] I/conn [CN-6(11)]Washer pump [CN-22(1)] Washer operating.

Fuse box(No.13) I/conn [CN-6(5)] I/conn [CN-17(4)] Wiper motor controller [CN-141(6) ¡ (4)] Wiper motor operating [CN-21(2), Low speed]

Auto parking(When switch OFF)Switch OFF [CN-116(15)] Wiper motor parking position by wiper motor controller

CHECK POINT

1)

(1)

(2)

(3)

(4)

(5)

¡ GND : Ground

2)


STOP ON

¤ - GND(Fuse box)



¤Œ- GND(Wiper Power input)

¤º- GND(Wiper power output)

¤ - GND(Wiper motor)

20~25V

4 -19

WIPER AND WASHER CIRCUIT(up to #1000)

21074EL11

4 -20

CN

-50

CN

-51 36

PU

MP

EP

PR

(+)

35N

C

34R

S23

2 (G

ND

)

33R

S23

2 (-

)

32R

S23

2 (+

)

31G

ND

30S

ER

IAL-

RX

29S

ER

IAL-

TX

28G

ND

(M

AIN

)

27N

C

26N

C

25N

C

BO

OM

PR

IOR

ITY

SO

L

BR

AK

E F

AIL

LA

MP

PO

WE

R IG

BA

TT

ER

Y 2

4V(+

)

NC

PA

RK

ING

SW

T/M

OIL

LA

MP

EN

G P

RE

HE

AT

ER

NC

CO

CA

NC

EL

SO

L

HO

UR

-ME

TE

R

AC

CE

L A

CT

(-)

EN

G O

IL F

ILT

ER

SW

PR

E-H

EA

T S

W

TR

AV

EL

SP

EE

D S

OL

OV

ER

LOA

D S

IG

24

NC

2322212019

PO

WE

R M

AX

SO

L

18171615

PU

MP

EP

PR

(-)

14

TR

AV

EL

BU

ZZ

ER

13

MA

X F

LOW

SO

L

AC

CE

L A

CT

(+)

AN

TI-

RE

ST

AR

T R

Y

NC

12111098765432136N

C

35N

C

34H

YD

TE

MP

SE

ND

OR

33W

AT

ER

TE

MP

SE

ND

OR

32P

UM

P P

RO

LIX

SW

31G

ND

(S

EN

SO

R)

30N

C

29A

CC

EL

SW

28T

/M O

IL P

S

27B

RA

KE

FA

IL P

S

26T

AC

HO

SE

NS

OR

(+)

25T

AC

HO

SE

NS

OR

(-)

WO

RK

ING

PS

FU

EL

LEV

EL

SE

NS

OR

PO

T-S

IG

TR

AV

EL

Hi/L

o S

W

AC

CE

L D

IAL

SIG

5V (

PO

T&

DIA

L)

HE

AV

Y L

IFT

SW

GN

D (

PO

T&

DIA

L)

242322212019

TR

AV

EL

ALA

RM

SW

181716A

IR C

LEA

NE

R S

W

PO

WE

R M

AX

SW

BK

T&

AR

M IN

PS

321

6 5

3 1

2

M-

M+

NC

6

5

4

M

3

2

1P+

SIG

P-

AC

& H

EA

TE

R

CP

U5

5A

2712

20A

11

5A

10

5A

9

10A

8

5A

7

10A

6

20A

4

10A

3

5A

2

5A

1

20A

CN

-46

SP

AR

E

SW

ITC

H P

AN

EL

CO

NV

ER

TO

R

CP

U

FU

EL

CU

T-O

FF

CLU

ST

ER

CA

SS

ET

TE

RA

DIO

WIP

ER

AC

& H

EA

TE

R

RO

OM

LA

MP

ST

AR

T K

EY

12

11

10

9

ACCEL ACTUATOR

CN-76

8

CN-9

7

6

5

4

3

2

1

8

CN-5

7

6

5

4

3

2

1

12

11

10

9

8

CN-1

7

6

5

4

3

2

1

CPU CONTROLLER

2

3

1

6

54

T

1

3

4

6

2

5

1

2

3

4

5

6

CS-7

PROLIX SW

rpm

1

2

2

1

CN-75

EPPR V/V

CD-17

TACHO SENSOR

h 2

1

CN-48

HOUR METER

A

B

C

S

+

CN-142

ACCEL DIAL

2

1

CN-47

RESISTOR

-

FUSE BOX

OR

W BB W R B YORLOR

B WOR

V

Y

OR

W

B

B

R

L

OR

WW/OR

OR

OR

OR

W

B

Y

L

W

B

Y

L

W

B

Y

L

Y

L

OR

OR

OR

V

B

OROR

V

B

CONTROLLER CIRCUIT(up to #1000)

21074EL11

4 -21

MONITORING CIRCUIT(up to #1000)

21074EL13

4-22

1

1

4-19 ELECTRIC CIRCUIT FOR HYDRAURIC

CN

-50

CN

-51 36

PU

MP

EP

PR

(+)

35N

C

34R

S23

2 (G

ND

)

33R

S23

2 (-

)

32R

S23

2 (+

)

31G

ND

30S

ER

IAL-

RX

29S

ER

IAL-

TX

28G

ND

(M

AIN

)

27N

C

26N

C

25N

C

BO

OM

PR

IOR

ITY

SO

L

BR

AK

E F

AIL

LA

MP

PO

WE

R IG

BA

TT

ER

Y 2

4V(+

)

NC

PA

RK

ING

SW

T/M

OIL

LA

MP

EN

G P

RE

HE

AT

ER

NC

CO

CA

NC

EL

SO

L

HO

UR

-ME

TE

R

AC

CE

L A

CT

(-)

EN

G O

IL F

ILT

ER

SW

PR

E-H

EA

T S

W

TR

AV

EL

SP

EE

D S

OL

OV

ER

LOA

D S

IG

24

NC

2322212019

PO

WE

R M

AX

SO

L

18171615

PU

MP

EP

PR

(-)

14

TR

AV

EL

BU

ZZ

ER

13

MA

X F

LOW

SO

L

AC

CE

L A

CT

(+)

AN

TI-

RE

ST

AR

T R

Y

NC

12111098765432136N

C

35N

C

34H

YD

TE

MP

SE

ND

OR

33W

AT

ER

TE

MP

SE

ND

OR

32P

UM

P P

RO

LIX

SW

31G

ND

(S

EN

SO

R)

30N

C

29A

CC

EL

SW

28T

/M O

IL P

S

27B

RA

KE

FA

IL P

S

26T

AC

HO

SE

NS

OR

(+)

25T

AC

HO

SE

NS

OR

(-)

WO

RK

ING

PS

WA

TE

R L

EV

EL

SW

FU

EL

LEV

EL

SE

NS

OR

24V

(PR

ES

.SE

NS

OR

)

PO

T-S

IG

TR

AV

EL

Hi/L

o S

W

O/T

DE

CE

L S

W

NC

ALT

LE

VE

L

BO

OM

UP

PS

EN

G O

IL P

S

AC

CE

L D

IAL

SIG

5V (

PO

T&

DIA

L)

HE

AV

Y L

IFT

SW

TR

AV

EL

OIL

PS

GN

D (

PO

T&

DIA

L)

24

P1

PR

ES

S S

IG.

2322212019

TR

AV

EL

ALA

RM

SW

18171615

GN

D(P

RE

S.S

EN

SO

R)

14

AIR

CLE

AN

ER

SW

13

PO

WE

R M

AX

SW

P3

PR

ES

S S

IG.

P2

PR

ES

S S

IG.

BK

T&

AR

M IN

PS

121110987654321

2

1

Pa

2

1

2

1

Pa

2

1

2

1

2

1

2

1

2

1

21P

a

21P

a 21 212121

21C

27

10A

26

10A

25

10A

24

5A

23

10A

22

5A

21

EARTH 1

FUSE BOX

CD

-37

CD-31

OVERLOAD PSCN-91

1

2

CN-131 BOOM DOWN EPPR

BOOM DOWN PRESS

GND

SIG

24V3

2

1

CD-32

CD-33

BOOM UP PRESS

GND

SIG

24V3

2

1

6

5

4

3

2

1

CN-14

DO-4

QUICK COUPLING

CN-140

CN-13

1

2

CN-66

BREAKER SOL.

SAFETY SOL

CN-68

CN-81

TRAVEL BZ

2PC

S B

OO

M A

UT

O-I

DLE

PS

CN

-15

CN

-15

2 1

SP

AR

E

FU

EL

FIL

LER

P/P

SO

LEN

OID

3

SA

FE

TY

SO

L

SO

LEN

OID

1

TR

AV

EL

TRAVELPS

CD-6

CD

-7

WORKPS

CN

-133

BOOMPRIORITY1

CN

-137

MAXFLOW

CN

-88

POWERMAX

CN

-70

TRAVEL

CD

-1

HYDTEMP

12

11

10

9

8

CN-7

7

6

5

4

3

2

1

12

11

10

9

8

CN-6

7

6

5

4

3

2

1

8

CN-4

7

6

5

4

3

2

1

CN-2

6

5

4

3

2

1

12

11

10

9

8

7

CN-8

6

5

4

3

2

1

CPU CONTROLLER

21

10A

20

10A

ET

HE

R(P

RE

-HE

AT

)

CIG

AR

LIG

HT

ER

7

86

2

10

9

8

7

6

5

4

3

2

1

109

51

CABIN LIGHT 24V

CABIN LIGHT 24V

INT. SIG

TRAVEL ALARM

GND

WASHER SIG

WORK LIGHT 24V

WORK LIGHT 24V

HEAD LIHGT 24V

CABIN LIGHT OUT

CABIN LIGHT OUT

POWER 24V

PRE-HEAT

WIPER MOTOR DRIVE

WORK LIGHT OUT

WORK LIGHT OUT

HEAD LIGHT OUT

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

2

1

CN-116

SWITCH PANEL

BREAKER SW

CS-27

BREAKER

CS-26

7

86

2

10

9

8

7

6

5

4

3

2

1

109

51

I

CS-52

BOOM DAMPING SW

CS-67

CS-50

QU

ICK

CO

UP

LIN

G S

WO

VE

RLO

AD

SW

2

1

2

1

SAFETY SW

CS-20

A

CB

C

B

A

POWER MAX

CS-19

ONE TOUCH DECEL

CS-29

CS-4

SAFETY SW

CD-44

PUMP1 PRESS

GND

SIG

24V 3

2

1

CD-43

CD-42

PUMP2 PRESS

PUMP3 PRESSGND

SIG

24V 3

2

1

GND

SIG

24V 3

2

1

6

5

4

3

2

1

CN-16

20

10A

HO

RN

10

9

8

7

6

5

4

3

2

10

9

8

7

6

5

4

3

2

7

86

2

109

51

7

86

2

109

51

R OR

RYGY

OR

Y

L

G

B

GY

OR

Y

L/W

G

B

GY

OR

Y

L/W

G

Y

B

B

B

B

LL

L

G

G

GY

OR

OR

Y

B

GY

B

G

OR OR

G

GY

Y

G

GY

Y

WLBR

G RGVB GGY

L VWVBR

WR BY RG GY

Y

RBR

RLRGYW

G

Y

G

R

RR

VV

BB

VW

VV

RR

R

G

W R

G

W

R

B

V

V

R

B

Y

B

YY

B

B

L

B

L

GY

B

GY

OR

GY

OR

GYOR GY

GY

GY

B

G

B

G

B

G

B

W

R

V

BR

B

W

R

V

BR

B

W

R

V

B

W

R

V

B

BR

BR

B

B

R

R

R

G

W

R

G

W

R

G

W

GY

B

YB

YY

R

B

B

B

B

B

ELECTRIC CIRCUIT FOR HYDRAULIC(up to #1000)

21074EL12

4 -54

1. POWER CIRCUIT (#1001 and up, TIER II)The negative terminal of battery is grounded to the machine chassis through master switch.When the start switch is in the OFF position, the current flows from the positive battery terminal asshown below.

OPERATING FLOWBattery Battery relay Fusible link ¡†CN-60¡‡

Fuse box ¡†No.1¡‡ l/conn¡†CN-8(12)¡‡ Start switch ¡†CS-2(1)¡‡Power relay ¡†CR-35(30)]

Fuse box ¡†No.2¡‡ I/conn¡†CN-10(6)¡‡ Room lamp ¡†CL-1(2)¡‡ Door switch ¡†CS-1¡‡Cassette radio ¡†CN-27(11)¡‡

Fuse box ¡†No.3¡‡ l/conn¡†CN-11(4)¡‡ AC & Heater controller ¡†CN -116(3, 4)¡‡Fuse box ¡†No.4¡‡ I/conn¡†CN - 5(4)¡‡ I/conn¡†CN -17(5)¡‡ Wiper motor controller

¡†CN-141(7)¡‡Wiper motor ¡†CN-21(4)¡‡

Fuse box ¡†No.5¡‡ CPU controller ¡†CN-50(7)¡‡Fuse box ¡†No.6¡‡ I/conn¡†CN-11(5)¡‡ Relay(Hi, M2)

¡ I/conn : Intermediate connector

CHECK POINT


1)

2)

¡ GND : Ground

OFF OFF

¤ - GND (Battery 1EA)

¤Ł- GND (Battery 2EA)

¤Ø- GND (Battery 2EA)

¤Œ - GND (Fusible link)

10~12.5V

20~25V

20~25V

20~25V

4 -55

POWER CIRCUIT (#1001 and up, TIER II)

21074EL51

4 -56

2. STARTING CIRCUIT (#1001 and up, TIER II)

OPERATING FLOWBattery(+) terminal Battery relay¡†CR-1¡‡ Reset button ¡†CS-61¡‡ Fuse box ¡†No.1¡‡

I/conn¡†CN-8(12)¡‡ Start switch ¡†CS-2(1)¡‡

When start key switch is in ON positionStart switch ON ¡†CS-2(2)¡‡ I/conn¡†CN-8(11)¡‡ Battery relay ¡†CR-1¡‡

Battery relay operating (All power is supplied with the electric component)Start switch ON ¡†CS-2(3)¡‡ I/conn¡†CN-8(10)¡‡ Power relay ¡†CR-35(86) ¡ (87)¡‡

Fuse box ¡†No.12¡‡ l/conn¡†CN-2(5)¡‡ Fuel cut-off ¡†CN-79(1)¡‡

When start key switch is in START positionStart switch START ¡†CS-2(5)¡‡ I/conn¡†CN-8(9)¡‡ Safety relay ¡†CR-5(86) ¡ (30)¡‡

l/conn¡†CN-3(2)¡‡ Start relay ¡†CR-23¡‡l/conn¡†CN-2(4)¡‡ Fuel cut off ¡†CN-79(2)¡‡

CHECK POINT

1)

(1)

(2)

2)


OPERATING START

¤ - GND(Battery)

¤Ł- GND(Start key)

¤Ø- GND(Battery relay M4)

¤Œ- GND(Starter B+)

¤º- GND(Starter M)

¤ - GND(Start relay)

¤ - GND(Battery relay M8)

20~25V

¡ GND : Ground

4 -57

STARTING CIRCUIT (#1001 and up, TIER II)

21074EL52

4 -58

CHECK POINT

3. CHARGING CIRCUIT (#1001 and up, TIER II)When the starter is activated and the engine is started, the operator releases the key switch to the ONposition.Charging current generated by operating alternator flows into the battery through the battery relay(CR-1).The current also flows from alternator to each electrical component and controller through the fuse box.

OPERATING FLOW

Warning flowAlternator "I" terminal I/conn ¡†CN-3(3)¡‡ CPU alternator level ¡†CN-51(9)¡‡Cluster charging warning lamp(Via serial interface)

Charging flowAlternator "B+" terminal Battery relay(M8) Battery(+) terminal

Reset button ¡†CN-60¡‡ Fuse box

1)

2)

(1)

(2)

¡ GND : Ground


Run ON

¤ - GND(Battery voltage)

¤Ł- GND(Battery relay)

¤Ø- GND(Alternator B+ terminal)

¤Œ- GND(Alternator I terminal)

¤º- GND(CPU)

20~30V

4 -59

CHARGING CIRCUIT (#1001 and up, TIER II)

21074EL53

4 -60

4. HEAD AND WORK LIGHT CIRCUIT (#1001 and up, TIER II)

OPERATING FLOWFuse box (No.14) I/conn ¡†CN-7(7)¡‡ Switch panel ¡†CN-116(9)¡‡Fuse box (No.15) I/conn ¡†CN-7(8)¡‡ Switch panel ¡†CN-116(10,11)¡‡

Head light switch ON Head light switch ON ¡†CN-116(1)¡‡ l/conn¡†CN-7(1)]

Head light ON ¡†CL-4(2)¡‡: Head lamp ONl/conn¡†CN-10(2)¡‡ Cassette radio illumination ON ¡†CN-27(7)¡‡l/conn¡†CN-11(8)¡‡ AC & Heater controller illumination ONl/conn¡†CN-6(8)¡‡ Cigar light ¡†CL-2¡‡

Work light switch ON Work light switch ON ¡†CN-116(2,3)¡‡ l/conn¡†CN-7(2)¡‡ l/conn¡†CN-12(1)¡‡

Work light ON ¡†CL-5(2), CL-6(2)¡‡

CHECK POINT

1)

¡ GND : Ground

(1)

(2)

2)


STOP ON

ONSTOP

¤ - GND(Fuse box)



¤Œ- GND(Head light)

¤º- GND(Fuse box)

¤ - GND(Switch power input)

¤ - GND(Switch power output)

¤ - GND(Work light)

20~25V

20~25V

4 -61

HEAD AND WORK LIGHT CIRCUIT (#1001 and up, TIER II)

21074EL54

5. BEACON LAMP AND CAB LIGHT CIRCUIT (#1001 and up, TIER II)

OPERATING FLOWFuse box (No.17) I/conn ¡†CN-8(3)¡‡ Beacon lamp switch ¡†CN-23(6)¡‡Fuse box (No.16) I/conn ¡†CN-7(12)¡‡ Switch panel ¡†CN-116(16, 17)¡‡

Beacon lamp switch ONBeacon lamp switch ON ¡†CS-23(2)¡‡ Switch lndicator lamp ON ¡†CS-23(9)¡‡

l/conn¡†CN-8(4)¡‡ l/conn¡†CN-10(10)¡‡Beacon lamp ON ¡†CL-7¡‡

Cab light switch ONCab light switch ON ¡†CN-116(7, 8)¡‡ I/conn¡†CN-7(6)¡‡ I/conn¡†CN-10(11)¡‡

Cab light ON ¡†CL-8(2), CL-9(2)¡‡

CHECK POINT

4 -62

1)

2)

(1)

(2)

¡ GND : Ground


STOP

STOP

ON

ON

¤ - GND(Fuse box)



¤Œ- GND(Beacon lamp)

¤º- GND(Fuse box)

¤ - GND(Switch power input)

¤ - GND(Switch power output)

¤ - GND(Cab light)

20~25V

20~25V

4 -63

BEACON LAMP AND CAB LIGHT CIRCUIT (#1001 and up, TIER II)

21074EL55

4 -64

6. WIPER AND WASHER CIRCUIT (#1001 and up, TIER II)

OPERATING FLOW

Key switch ONFuse box (No.11) I/conn ¡†CN-7(5)¡‡ Switch panel ¡†CN-116(6)¡‡Fuse box (No.4) I/conn ¡†CN-5(4)¡‡ I/conn¡†CN-17(5)¡‡ Wiper motor controller ¡†CN-141(7)¡‡

Wiper motor ¡†CN-21(4)¡‡Fuse box (No.13) I/conn ¡†CN-6(5)¡‡ l/conn¡†CN-17(4)¡‡ Wiper motor controller ¡†CN-141(6)¡‡

Washer pump ¡†CN-22(2)¡‡

Wiper switch ON : 1st step(Intermittent)Wiper switch ON ¡†CN-116(15)¡‡ I/conn¡†CN-9(4)¡‡ I/conn¡†CN-6(10)¡‡ I/conn¡†CN-17(8)¡‡Wiper motor controller ¡†CN-141(10) ¡ (3)¡‡ Wiper motor intermittently operating ¡†CN-21(6)¡‡

Wiper switch ON : 2nd step(Low speed)Wiper switch ON ¡†CN-116(4)¡‡ I/conn¡†CN-7(3)¡‡ I/conn¡†CN-6(9)¡‡ I/conn¡†CN-17(2)¡‡Wiper motor controller ¡†CN-141(2) ¡ (4)¡‡ Wiper motor operating ¡†CN-21(2)¡‡

Washer switch ON Washer switch ON ¡†CN-116(12)¡‡ I/conn¡†CN-7(9)¡‡ I/conn¡†CN-5(1)¡‡ I/conn¡†CN-17(7)¡‡

Wiper motor controller ¡†CN-141(9) ¡ (8)¡‡ I/conn¡†CN-17(6)¡‡ I/conn¡†CN-6(11)¡‡Washer pump ¡†CN-22(1)¡‡ Washer operating

Fuse box(No.13) I/conn ¡†CN-6(5)¡‡ I/conn¡†CN-17(4)¡‡Wiper motor controller ¡†CN-141(6) ¡ (4)¡‡ Wiper motor operating ¡†CN-21(2), Low speed¡‡

Auto parking(When switch OFF)Switch OFF ¡†CN-116(15)¡‡ Wiper motor parking position by wiper motor controller

CHECK POINT

1)

(1)

(2)

(3)

(4)

(5)

¡ GND : Ground

2)


STOP ON

¤ - GND(Fuse box)



¤Œ- GND(Wiper Power input)

¤º- GND(Wiper power output)

¤ - GND(Wiper motor)

0 ~ 5V

24V

0 or 24V

4 -65

WIPER AND WASHER CIRCUIT (#1001 and up, TIER II)

21074EL56

4 -66

CONTROLLER CIRCUIT (#1001 and up, TIER II)

21074EL57

4 -67

MONTORING CIRCUIT (#1001 and up, TIER II)

21074EL58

Automotive

Sit electrico