GROUP 2 ELECTRICAL CIRCUIT

7-2


CAB SIDE

T/M HARNESS

GAUGE SIDE

7-4

FRONT SIDE


1. ILLUMINATION CIRCUIT
1) OPERATING FLOW
Fuse box (No.2)
Illumination switch [CS-39(1)]
Switch ON, 1st step
[CS-39(7)]
Hazard and illumination switch indicator lamp ON
[CS-39(5)]
Fuse box(27)
I/conn [CN-2(6)]
RH Combi clearance lamp ON [CL-16(4)]
I/conn [CN-4(1)]
LH Head lamp ON [CL-3(4)]
Fuse box(26)
I/conn [CN-2(5)]

No. plate lamp ON [CL-21(2)]
LH Combi clearance lamp ON [CL-15(4)]
I/conn [CN-4(2)]
RH Head lamp ON [CL-4(4)]
I/conn [CN-7(14)]
All cluster guage lamp ON
2) CHECK POINT
Engine

Key switch

Check point

Voltage

‫ ڸ‬- GND (Switch input)
‫ ڹ‬- GND (Switch output)
OFF

ON

‫ ں‬- GND (To light)
‫ ڻ‬- GND (To gauge lamp)

Ɠ GND : Ground

7-5

20~25V



ILLUMINATION CIRCUIT
FUSE BOX

106 GL

143 RG
046 RL

CN-36
LH HEAD LIGHT

2

CL-3

ILL & HEAD LAMP SW

3

RH HEAD LIGHT

CN-4
CL-4

3
NUMBERPLATE LAMP

1
CL-21

RH COMBI

CN-8

3

CL-16
LH COMBI

CL-15

CN-2

0.5R

0.5R

G3

SPEED METER
3
4
8

E
B
S

km/h


CN-127
T/M TEMP
CS-41

CS-39

CN-119
WATER TEMP
HAZARD SW

J2

CN-117
VOLT METER

CN-104
FUEL METER
CN-7

4
CN-107

7-6


2. HEAD LIGHT CIRCUIT
1) OPERATING FLOW
Fuse box(No.3)
Head light switch [CS-39(4)]
Light switch ON, 2nd step [CS-39(2)]

Multi function switch [CS-11(8)]
Head light high beam power supply
Multi function switch MIDDLE [CS-11(7)]
I/conn [CN-4(3)]
LH Head light low beam
ON [CL-3(1)]
RH Head light low beam
ON [CL-4(1)]
Multi function switch DOWN [CS-11(6)]
I/conn [CN-4(4)]
LH Head light high beam
ON [CL-3(2)]
RH Head light high beam
ON [CL-4(2)]
I/conn [CN-7(3)]
Cluster high beam pilot
lamp ON [CL-41(2)]

2) CHECK POINT
Engine

Key switch

Check point

Voltage

‫ ڸ‬- GND (Switch input)
‫ ڹ‬- GND (Switch output)
‫ ں‬- GND (Multi function input)

‫ ڻ‬- GND (Multi function output)
OFF

ON

‫ ڼ‬- GND (Multi function output)
‫ ڽ‬- GND (Low beam)
‫ ھ‬- GND (High beam)
‫ ڿ‬- GND (Passing B+)

Ɠ GND : Ground

7-7

20~25V


HEAD LIGHT CIRCUIT

FUSE BOX

CN-36

LH HEAD LIGHT
ILL & HEAD LAMP SW

1
CL-3

RH HEAD LIGHT


CS-39
CL-4

2
CN-8

6
HI BEAM PILOT LAMP

7
CL-41
CN-4

4
3

8

CS-11

5

CN-7

MULTI FUNCTION SW

7-8



3. WORK LIGHT SWITCH
1) OPERATING FLOW
Fuse box(No.12)
Front work light switch [CS-21(6)]
Work light switch ON [CS-21(2)]
I/conn [CN-5(4)]
LH Front work lamp ON [CL-6(2)]
RH Front work lamp ON [CL-5(2)]
Front work lamp switch indicator lamp ON
Rear work light switch [CS-20(6)]
Work light switch ON [CS-20(2)]
I/conn [CN-5(3)]
LH Rear work lamp ON [CL-22(2)]
RH Rear work lamp ON [CL-23(2)]
Rear work lamp switch indicator lamp ON
2) CHECK POINT
Engine

Key switch

Check point

Voltage

‫ ڸ‬- GND (Switch input)
‫ ڹ‬- GND (Switch output)
OFF

ON


‫ ں‬- GND (Front work light)
‫ ڻ‬- GND (Rear work light)

Ɠ GND : Ground

7-9

20~25V


WORK LIGHT SWITCH

FUSE BOX

CN-36

3
FRONT WORK
LIGHT,LH
FRONT WORK LAMP SW
CN-5

CL-6
FRONT WORK
LIGHT,RH

CL-5

1
CS-21


3

2

4
REAR WORK
LIGHT,LH

REAR WORK LAMP SW
CL-22
REAR WORK
LIGHT,RH

1

CL-23

4

CS-20

2

7-10


4. STARTING CIRCUIT
1) OPERATING FLOW
Battery(+) terminal

Battery relay(M8, B+ terminal)
Fusible link [CN-60(1)]
I/conn [CN-1(1)]
Fuse box (No.15)
Start switch [CS-2(1)]
Ɠ The gear selector lever is neutral position. It is necessary condition before the starting.
The gear selector lever has an output signal which is activated whenever the shift lever is in the
neutral position. This signal can be used to control a relay and prevent engine from starting
whenever the shift lever is not in the neutral position.
(1) When start key switch is in ON position
Start switch ON
Start switch [CS-2(2)]
I/conn [CN-2(2)]
Battery relay [CR-1]
Battery relay operating(All power is supplied with the electric component)
Start switch [CS-2(3)]
Fuse box [No.19]
I/conn [CN-3(3)]
I/conn [CN-13(5)]
Fuel shut off solenoid [CN-79]
(2) When start key switch is in START position
Start switch START [CS-2(5)]
Start safety relay [CR-5(30)]
Start safety relay [CR-5(87)]
I/conn [CN-3(2)]
I/conn [CN-13(4)]
Start relay [CR-23(1)]
Starter(Terminal B+ and M connector of start motor)
2) CHECK POINT
Engine


Key switch

Check point

Voltage

‫ ڸ‬- GND (Battery B+)
‫ ڹ‬- GND (Fusible link)
‫ ں‬- GND (Start key B+)
‫ ڻ‬- GND (Start key BR terminal)
‫ ڼ‬- GND (I/conn CN-2(2))
Running

ON

‫ ڽ‬- GND (Start key R2 terminal)
‫ ھ‬- GND (Start safety relay output)
‫ ڿ‬- GND (Check unit)
‫ ۀ‬- GND (Start key IG terminal)
‫ ہ‬- GND (Fuel shut off solenoid)

Ɠ GND : Ground

7-11

20~28V


CHECK UNIT


CN-111

CN-58

FUSE BOX

8
SAFETY RY

7

CR-5

GEAR SELECTOR

CN-15
CN-36

1

MASTER SW
BATT RY

60R

60R

60B


60B

CS-61
CR-1

DO-3
STARTER
CN-60

CN-1

2
CN-45

DO-2

START RY

GLOW PLUG CONTROLLER
1
825 B
5 3 4
8 GND
NC
ACC

4

9


5
1

5

DO-1
CR-23

809 YL
810 BG

EXCESS FUEL SOL

IN
OUT

CN-62

3

6

START
I> LAMP
U>
IN
9 OUT

2
3

4

CN-130

10
FUEL SHUT OFF SOL

CS-2

CN-2

CN-79

START SWITCH

CN-13
CN-3

7-12


5. FUEL SHUT OFF CIRCUIT
1) OPERATING FLOW
Start key OFF [CS-2(3)]
Fuse box (No.19)
Fuel shut off solenoid [CN-79(1)]

I/conn [CN-3(3)]

I/conn [CN-13(5)]


2) CHECK POINT
Engine

Key switch

OFF

OFF

Check point

Voltage

‫ ۀ‬- GND (Start key IG terminal)
‫ ہ‬- GND (Fuel shut off solenoid)

Ɠ GND : Ground

3) WIRING DIAGRAM - See page 7-12.

7-13

0V


6. CHARGING CIRCUIT
When the starter is activated and the engine is started, the operator releases the key switch to the
ON position.
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.
1) OPERATING FLOW
(1) Warning flow
Altermator [CN-74(D+)]
I/conn [CN-13(3)]
I/conn [CN-3(1)]
Check unit [CN-58(2)]
I/conn [CN-6(1)]
Cluster charge warning lamp ON [CL-46(1), Below 24V]
J1(332)ơ(336)
Volt meter [CN-104(B)]
(2) Charging flow
Alternator [CN-74(B+)]
Battery relay [CR-1]
Battery(+) terminal
Charging
I/conn [CN-60(1),(2)]
I/conn [CN-1(1),(2)]

Fuse box

2) CHECK POINT
Engine

Key switch

Check point


Voltage

‫ ڸ‬- GND (Battery)
‫ ڹ‬- GND (Battery relay)
Running

ON

‫ ں‬- GND (ALT B+)
‫ ڻ‬- GND (ALT D+)

20~28V

‫ ڼ‬- GND (Check unit)
‫ ڽ‬- GND (Fuse box)

Engine

Key switch

Running

ON

Check point
‫ ھ‬- GND (Cluster)

Ɠ GND : Ground

7-14


Resistance
ſ‫װ‬


CHARGING CIRCUIT

FUSE BOX

6

CHECK UNIT

CN-1
CN-58

CN-60

5

CN-36

2

CHARGE WARNING LAMP

1
MASTER SW

BATT RY


CL-46

60R

60R

60B

60B

7
TO STARTER
DO-5

CR-1

VOLT METER

CN-104

3

CN-6

ALTERNATOR
B+
W
D+
CN-74


4

CN-13

CN-3

7-15


7. ELECTRIC PARKING, DECLUTCH CIRCUIT
1) OPERATING FLOW
(1) Parking OFF
Fuse box (No.13)
Parking switch [CS-4(1)‫(آ‬3)]
Parking relay [CR-28(30)‫(آ‬87)]
Parking brake released
(2) Parking ON
Fuse box (No.13)
Parking relay [CR-28(30)‫(آ‬87a)]
I/conn [CN-15(6)]
Control unit [CN-111(22)]
T/M declutch
Parking switch [CS-4(1)‫(آ‬2)]
Check unit [CN-58(8)‫(آ‬4)]
Parking switch indicator lamp ON
Parking brake applied
(3) Declutch ON
Fuse box (No.10)


Clutch cut-off switch ON

Clutch cut-off switch [CS-42(6)‫(آ‬2)]
Clutch cut-off switch indicator lamp ON
Clutch cut-off switch [CS-42(5)‫(آ‬1)]
Service brake applied
Service brake pressure switch ON [CD-5]
I/conn [CN-15(6)]
Control
unit [CN-111(22)]
Declutch

2) CHECK POINT
Engine

Key switch

Running

ON

Check point
‫ ڸ‬- GND (Clutch cut-off press switch)
‫ ڹ‬- GND (Declutch input signal)

Ɠ GND : Ground

7-16

Voltage

20~28V


ELECTRIC PARKING, DECLUTCH CIRCUIT

CN-111

FUSE BOX

CN-58

CHECK UNIT

2

2
CN-15
PARKING RY

CR-28
PARKING SW

CS-4
CN-36
CS-42

CD-5

CLUTCH CUT-OFF SW


1

CLUTCH CUT OFF

7-17


8. WIPER AND WASHER CIRCUIT
1) OPERATING FLOW
Fuse box (No.11)
Wiper relay Hi [CR-4(30)‫(آ‬87a)]

Front wiper motor [CN-21(1)]
Wiper relay Lo [CR-26(86), (87)]

Multi function switch [CS-12(6)]
Rear wiper & washer switch [CS-3(1)]
Rear wiper motor [CN-102(1)]
(1) Front washer switch ON
‫ ڸ‬Washer switch ON [CS-12(6)‫(آ‬2)]

Washer tank [CN-22(2)]
Washer operating
Check unit [CN-58(21)‫(آ‬15)]
Wiper relay Lo
[CR-26(87)‫(آ‬30)]
Wiper motor [CN-21(5)]
Wiper motor operating(Low)

(2) Front wiper switch ON

‫ ڸ‬INT position
Wiper switch ON [CS-12(6)‫(آ‬1)]
Check unit [CN-58(10)‫(آ‬15)] intermittent signal
Wiper
relay Lo [CR-26(87)‫(آ‬30)]
Wiper motor [CN-21(5)]
Wiper motor intermittently operating
‫ ڹ‬Lo position
Wiper switch ON [CS-12(6)‫(آ‬4)]
Wiper relay Lo [CR-26(87a)‫(آ‬30)]
Wiper motor
[CN-21(5)]
Wiper motor operating (Low)
‫ ں‬Hi position
Wiper switch ON [CS-12(6)‫(آ‬3)]
Wiper relay Hi [CR-4(30)‫(آ‬87)]
Wiper motor [CN21(4)]
Wiper motor operating(High)
(3)
Auto-parking(When switch OFF)
Switch OFF
Fuse box (No.11)
Wiper relay Hi [CR-4(30)‫(آ‬87a)]
Wiper motor
[CN-21(1)‫(آ‬2)]
Multi function switch [CS-12(5)‫(آ‬4)]
Wiper relay Lo [CR-26(87a)‫(آ‬30)]
Front wiper motor [CN-21(5)]
Wiper motor stop
(4)

‫ ڸ‬Rear wiper and washer switch
Wiper switch ON(1st step)
Wiper switch ON [CS-3(1)‫(آ‬6)]
Wiper motor [CN-102(5)]
Wiper motor operating
‫ڹ‬
Rear wiper and washer switch indicator lamp ON
Washer switch ON(2nd step)
2) Washer switch ON [CS-3(1)‫(آ‬3)]
Rear washer tank [CN-103(2)]
Washer operating
Engine

Key switch

Check point

Voltage

‫ ڸ‬- GND (Front wiper switch power input)
‫ ڹ‬- GND (Rear wiper switch power input)

Stop

ON

‫ ں‬- GND (Wiper relay power input)
‫ ڻ‬- GND (Front wiper motor Lo power input)
‫ ڼ‬- GND (Front wiper motor High power input)
‫ ڽ‬- GND (Wiper relay power input)

‫ ھ‬- GND (Front washer power output)
‫ ڿ‬- GND (Rear washer power output)
‫ ۀ‬- GND (Front wiper motor power output)
‫ ہ‬- GND (Rear wiper motor power output)

Ɠ GND : Ground

7-18

20~25V


WIPER AND WASHER CIRCUIT

CHECK UNIT

FUSE BOX

CN-58

CN-102

REAR WIPER

CN-36

6
WIPER RY Lo

CR-26


WIPER RY Hi

CR-4

3
9
7

5
4

CS-5

8

CS-12

10

CS-11

1

CN-103

CN-22

R/WASHER


REAR WIPER & WASHER SW

F/WASHER

CS-3

CN-21

2

FRONT WIPER

MULTIFUNCTION SWITCH

7-19


MONITORING CIRCUIT

T/M TEMP

CHECK UNIT

BRAKE OIL
CN-119
CL-45
WATER TEMP
CN-58

ENGINE OIL


CL-49
CN-117

OVER HEAT
HYD TEMP

FUEL METER

CL-48
PARKING

CL-47

CL-44

CN-107

CN-6

T/M OIL TEMP

CD-29
CN-9

CN-7

FUEL SENDER

CD-2


CN-3
ENG OIL PRESS

CD-18
OVER HEAT SW

CD-1

CD-3

CS-4

CN-2

CD-9
WATER TEMP

PARKING SW

BRAKE OIL PS

CN-13
HYD TEMP SW

CD-8

7-20



HAZARD, TURN AND ROTARY CIRCUIT
FUSE BOX

COMBI LAMP RH

CL-16

ROTARY LAMP

COMBI LAMP LH

CN-5

CL-7

CN-2
CL-15

FLASHER UNIT

CN-36
CR-11
RH TURN ,RR

CL-43
LH TURN ,RR

CL-42

CN-7


CS-5

CS-12

CS-11

LH TURN,FR

CL-24
RH TURN,FR
CN-8

CS-23

CS-41

CL-25

HAZARD SWITCH

BEACON LAMP SWITCH

MULTI FUNCTION SWITCH

CN-4

7-21