sistemo electrico

1. 4-3
GROUP 2 ELECTRICAL CIRCUIT (up to #1000)
21074EC01
¡⁄ Machine serial no : up to #0179

2. 4-3-1
21074EC01A
¡⁄ Machine serial no : #0180~#1000

3. 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 shown
below.
OPERATING FLOW
Battery 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 (Battery 2 EA)
- GND (Battery 2 EA)
- GND (Reset button)
10~12.5V
20~25V
20~25V
20~25V
2) CHECK POINT
I/conn : Intermediate connector

4. 4-5
POWER CIRCUIT(up to #0179)
21074EL03

5. 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 as
shown below.
OPERATING FLOW
Battery 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
Engine Start switch Check point Voltage
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

6. 4-5-2
POWER CIRCUIT (from #0180 to #1000)
21074EL03A

7. 2. STARTING CIRCUIT(up to #1000)
OPERATING FLOW
Battery(+) 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 : ON
Start 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
Engine Start switch Check point Voltage
¤ -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

8. 4-7
STARTING CIRCUIT(up to #1000)
21074EL05

9. 3. CHARGING CIRCUIT(up to #1000)
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.
OPERATING FLOW
Warning flow
Alternator¡ I¡–terminal I/conn¡†CN-3(6)¡‡ CPU Controller [CN-51(9)]
Cluster warning lamp (Via serial interface)
Charging flow
Alternator "B+" terminal Battery relay(M8) Battery(+) terminal
Reset button[CS-61] Fuse box
4-8
Engine Start switch Check point Voltage
¤ - 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

10. 4 -9
CHARGINGING CIRCUIT(up to #1000)
21074EL06

11. 4 -10
4. HEAD LAMP CIRCUIT(up to #1000)
OPERATING FLOW
Fuse box (No.14) I/conn [CN-7(7)] Switch panel [CN-116(9)]
¡ When lamp switch ON
Switch 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 ON
I/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

12. 4 -11
HEAD LAMP CIRCUIT(up to #1000)
21074EL07

13. 4 -12
5. WORK LAMP CIRCUIT(up to #1000)
OPERATING FLOW
Fuse box (No.15) I/conn [CN-7(8)] Switch panel [CN-116(10,11)]
¡ When work lamp switch ON
Work 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

14. 4-13
WORK LAMP CIRCUIT(up to #1000)
21074EL08

15. 4 -14
6. CAB LAMP CIRCUIT(up to #1000)
OPERATING FLOW
Fuse box (No.16) I/conn¡†CN-7(12)¡‡ Switch panel [CN-116(16,17)]
¡ When Lamp switch ON
Lamp 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

16. 4-15
2
1
2
1
CABIN LIGHT
CL-9
CL-8
AC&HEATER
CPU
5
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
SPARE
FUELFILLERP/P
SOLENOID3
SAFETYSOL
SOLENOID1
TRAVEL
ETHER(PRE-HEAT)
CIGARLIGHTER
HORN
AC&HEATER
BEACONLAMP
CABINLAMP
WORKLAMP
HEADLAMP
WIPERMOTOR
SWITCHPANEL
CONVERTOR
CPU
FUELCUT-OFF
CLUSTER
CASSETTERADIO
WIPER
AC&HEATER
ROOMLAMP
STARTKEY
CN-7
CABINLIGHT24V
CABINLIGHT24V
INT.SIG
TRAVELALARM
GND
WASHERSIG
WORKLIGHT24V
WORKLIGHT24V
HEADLIHGT24V
CABINLIGHTOUT
CABINLIGHTOUT
POWER24V
PRE-HEAT
WIPERMOTORDRIVE
WORKLIGHTOUT
WORKLIGHTOUT
HEADLIGHTOUT
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
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
R
OR
OROR
OR
OR
CAB LAMP CIRCUIT(up to #1000)
21074EL09

17. 4 -16
7. BEACON LAMP CIRCUIT(up to #1000)
OPERATING FLOW
Fuse box (No.17) I/conn [CN-8(3)] Beacon lamp switch [CN-23(6)]
¡ When lamp switch ON
Beacon 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
Engine Start switch Check point Voltage
STOP ON
¤ - GND(Fuse box)
¤Ł- GND(Switch power input)
¤Ø- GND(Switch power output)
¤Œ- GND(Beacon lamp)
20~25V

18. 4-17
STARTKEY
ROOMLAMP
AC&HEATER
WIPER+
CASSETTERADIO
CLUSTER
CPU
CONVERTOR
SWITCHPANEL
FUELCUT-OFF
WIPERMOTOR
HEADLAMP
WORKLAMP
CABLAMP
BEACONLAMP
AC&HEATER
HORN
CIGARLIGHTER
ETHER(PRE-HEAT)
TRAVEL
SOLENOID1
SOLENOID3
FUELFILLERPUMP
SPARE
CN-46
FUSEBOX
20A
1
5A
2
5A
3
10A
4
20A
6
10A
7
5A
8
10A
9
5A
10
5A
11
20A
12
20A
13
5A
14
10A
15
10A
16
5A
17
20A
18
10A
19
10A
20
10A
21
5A
22
10A
23
5A
24
10A
25
10A
26
10A
27
CPUB+5A
5
20A
28
SPARE
SAFETYSOLENOID
ACBLOWER
4
1
1
2
3
4
5
6
7
Y
CN-8
8
9
10
11
12
1
2
3
4
5
6
7
CN-10
8
9
10
11
12
Y
B
G
Y
G
CS-23
BEACON LAMP SW
1
5
9 10
1
2
3
4
5
6
7
8
9
10
2
6
8
7
G
G
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
HEADLIGHTOUT
WORKLIGHTOUT
WORKLIGHTOUT
WIPERMOTORDRIVE
PRE-HEAT
POWER24V
CABINLIGHTOUT
CABINLIGHTOUT
HEADLIHGT24V
WORKLIGHT24V
WORKLIGHT24V
WASHERSIG
GND
TRAVELALARM
INT.SIG
CABINLIGHT24V
CABINLIGHT24V
R
OR
OR
8
7
R
R
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

19. 4 -18
8. WIPER AND WASHER CIRCUIT(up to #1000)
OPERATING FLOW
Key switch ON
Fuse 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)
Engine Start switch Check point Voltage
STOP ON
¤ - GND(Fuse box)
¤Ł- GND(Switch power input)
¤Ø- GND(Switch power output)
¤Œ- GND(Wiper Power input)
¤º- GND(Wiper power output)
¤ - GND(Wiper motor)
20~25V

20. 4-19
WIPER AND WASHER CIRCUIT(up to #1000)
21074EL11

21. 4 -20
CN-50
CN-51
36PUMPEPPR(+)
35NC
34RS232(GND)
33RS232(-)
32RS232(+)
31GND
30SERIAL-RX
29SERIAL-TX
28GND(MAIN)
27NC
26NC
25NC
BOOMPRIORITYSOL
BRAKEFAILLAMP
POWERIG
BATTERY24V(+)
NC
PARKINGSW
T/MOILLAMP
ENGPREHEATER
NC
COCANCELSOL
HOUR-METER
ACCELACT(-)
ENGOILFILTERSW
PRE-HEATSW
TRAVELSPEEDSOL
OVERLOADSIG
24
NC
23
22
21
20
19
POWERMAXSOL
18
17
16
15
PUMPEPPR(-)
14
TRAVELBUZZER
13
MAXFLOWSOL
ACCELACT(+)
ANTI-RESTARTRY
NC
12
11
10
9
8
7
6
5
4
3
2
1
36NC
35NC
34HYDTEMPSENDOR
33WATERTEMPSENDOR
32PUMPPROLIXSW
31GND(SENSOR)
30NC
29ACCELSW
28T/MOILPS
27BRAKEFAILPS
26TACHOSENSOR(+)
25TACHOSENSOR(-)
WORKINGPS
FUELLEVELSENSOR
POT-SIG
TRAVELHi/LoSW
ACCELDIALSIG
5V(POT&DIAL)
HEAVYLIFTSW
GND(POT&DIAL)
24
23
22
21
20
19
TRAVELALARMSW
18
17
16AIRCLEANERSW
POWERMAXSW
BKT&ARMINPS
3
2
1
6 5
3 1
2
M-
M+
NC
6
5
4
M
3
2
1P+
SIG
P-
AC&HEATER
CPU
5
5A
27
12
20A
11
5A
10
5A
9
10A
8
5A
7
10A
6
20A
4
10A
3
5A
2
5A
1
20A
CN-46
SPARE
SWITCHPANEL
CONVERTOR
CPU
FUELCUT-OFF
CLUSTER
CASSETTERADIO
WIPER
AC&HEATER
ROOMLAMP
STARTKEY
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
B
B
W
R
B
Y
OR
L
OR
B
W
OR
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

22. 4-21
MONITORING CIRCUIT(up to #1000)
21074EL13

23. 4-22
1
1
4-19 ELECTRIC CIRCUIT FOR HYDRAURIC
CN-50
CN-51
36PUMPEPPR(+)
35NC
34RS232(GND)
33RS232(-)
32RS232(+)
31GND
30SERIAL-RX
29SERIAL-TX
28GND(MAIN)
27NC
26NC
25NC
BOOMPRIORITYSOL
BRAKEFAILLAMP
POWERIG
BATTERY24V(+)
NC
PARKINGSW
T/MOILLAMP
ENGPREHEATER
NC
COCANCELSOL
HOUR-METER
ACCELACT(-)
ENGOILFILTERSW
PRE-HEATSW
TRAVELSPEEDSOL
OVERLOADSIG
24
NC
23
22
21
20
19
POWERMAXSOL
18
17
16
15
PUMPEPPR(-)
14
TRAVELBUZZER
13
MAXFLOWSOL
ACCELACT(+)
ANTI-RESTARTRY
NC
12
11
10
9
8
7
6
5
4
3
2
1
36NC
35NC
34HYDTEMPSENDOR
33WATERTEMPSENDOR
32PUMPPROLIXSW
31GND(SENSOR)
30NC
29ACCELSW
28T/MOILPS
27BRAKEFAILPS
26TACHOSENSOR(+)
25TACHOSENSOR(-)
WORKINGPS
WATERLEVELSW
FUELLEVELSENSOR
24V(PRES.SENSOR)
POT-SIG
TRAVELHi/LoSW
O/TDECELSW
NC
ALTLEVEL
BOOMUPPS
ENGOILPS
ACCELDIALSIG
5V(POT&DIAL)
HEAVYLIFTSW
TRAVELOILPS
GND(POT&DIAL)
24
P1PRESSSIG.
23
22
21
20
19
TRAVELALARMSW
18
17
16
15
GND(PRES.SENSOR)
14
AIRCLEANERSW
13
POWERMAXSW
P3PRESSSIG.
P2PRESSSIG.
BKT&ARMINPS
12
11
10
9
8
7
6
5
4
3
2
1
2
1
Pa
2
1
2
1
Pa
2
1
2
1
2
1
2
1
2
1
2
1Pa
2
1Pa
2
1
2
1
2
1
2
1
2
1C
27
10A
26
10A
25
10A
24
5A
23
10A
22
5A
21
EARTH 1
FUSE BOX
CD-37
CD-31
OVERLOAD PS
CN-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
2PCSBOOMAUTO-IDLEPS
CN-15CN-15
2
1
SPARE
FUELFILLERP/P
SOLENOID3
SAFETYSOL
SOLENOID1
TRAVEL
TRAVEL
PS
CD-6
CD-7
WORK
PS
CN-133
BOOM
PRIORITY1
CN-137
MAX
FLOW
CN-88
POWER
MAX
CN-70
TRAVEL
CD-1
HYD
TEMP
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
ETHER(PRE-HEAT)
CIGARLIGHTER
7
8
6
2
10
9
8
7
6
5
4
3
2
1
109
5
1
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
8
6
2
10
9
8
7
6
5
4
3
2
1
109
5
1
I
CS-52
BOOM DAMPING SW
CS-67
CS-50
QUICKCOUPLINGSWOVERLOADSW
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 PRESS
GND
SIG
24V 3
2
1
GND
SIG
24V 3
2
1
6
5
4
3
2
1
CN-16
20
10AHORN
10
9
8
7
6
5
4
3
2
10
9
8
7
6
5
4
3
2
7
8
6
2
109
5
1
7
8
6
2
109
5
1
R
OR
R
Y
GY
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
W
L
BR
G
R
G
V
B
G
GY
L
V
W
V
BR
W
R
B
Y
R
G
GY
Y
R
BR
R
L
R
G
Y
W
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
GY
OR 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
Y
B
Y
Y
R
B
B
B
B
B
ELECTRIC CIRCUIT FOR HYDRAULIC(up to #1000)
21074EL12

24. 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 as
shown below.
OPERATING FLOW
Battery 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
Engine Start switch Check point Voltage
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

25. 4-55
POWER CIRCUIT (#1001 and up, TIER II)
21074EL51

26. 4 -56
2. STARTING CIRCUIT (#1001 and up, TIER II)
OPERATING FLOW
Battery(+) 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 position
Start 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 position
Start 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)
Engine Start switch Check point Voltage
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

27. 4-57
STARTING CIRCUIT (#1001 and up, TIER II)
21074EL52

28. 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 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.
OPERATING FLOW
Warning flow
Alternator "I" terminal I/conn¡†CN-3(3)¡‡ CPU alternator level¡†CN-51(9)¡‡
Cluster charging warning lamp(Via serial interface)
Charging flow
Alternator "B+" terminal Battery relay(M8) Battery(+) terminal
Reset button¡†CN-60¡‡ Fuse box
1)
2)
(1)
(2)
¡ GND : Ground
Engine Start switch Check point Voltage
Run ON
¤ - GND(Battery voltage)
¤Ł- GND(Battery relay)
¤Ø- GND(Alternator B+ terminal)
¤Œ- GND(Alternator I terminal)
¤º- GND(CPU)
20~30V

29. 4-59
CHARGING CIRCUIT (#1001 and up, TIER II)
21074EL53

30. 4 -60
4. HEAD AND WORK LIGHT CIRCUIT (#1001 and up, TIER II)
OPERATING FLOW
Fuse 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 ON
l/conn¡†CN-10(2)¡‡ Cassette radio illumination ON¡†CN-27(7)¡‡
l/conn¡†CN-11(8)¡‡ AC & Heater controller illumination ON
l/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)
Engine Start switch Check point Voltage
STOP ON
ONSTOP
¤ - GND(Fuse box)
¤Ł- GND(Switch power input)
¤Ø- GND(Switch power output)
¤Œ- GND(Head light)
¤º- GND(Fuse box)
¤ - GND(Switch power input)
¤ -GND(Switch power output)
¤ - GND(Work light)
20~25V
20~25V

31. 4-61
HEAD AND WORK LIGHT CIRCUIT (#1001 and up, TIER II)
21074EL54

32. 5. BEACON LAMP AND CAB LIGHT CIRCUIT (#1001 and up, TIER II)
OPERATING FLOW
Fuse 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 ON
Beacon 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 ON
Cab 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
Engine Start switch Check point Voltage
STOP
STOP
ON
ON
¤ - GND(Fuse box)
¤Ł- GND(Switch power input)
¤Ø- GND(Switch power output)
¤Œ- GND(Beacon lamp)
¤º- GND(Fuse box)
¤ - GND(Switch power input)
¤ - GND(Switch power output)
¤ - GND(Cab light)
20~25V
20~25V

33. 4-63
BEACON LAMP AND CAB LIGHT CIRCUIT (#1001 and up, TIER II)
21074EL55

34. 4 -64
6. WIPER AND WASHER CIRCUIT (#1001 and up, TIER II)
OPERATING FLOW
Key switch ON
Fuse 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)
Engine Start switch Check point Voltage
STOP ON
¤ - GND(Fuse box)
¤Ł- GND(Switch power input)
¤Ø- GND(Switch power output)
¤Œ- GND(Wiper Power input)
¤º- GND(Wiper power output)
¤ - GND(Wiper motor)
0 ~ 5V
24V
0 or 24V

35. 4-65
WIPER AND WASHER CIRCUIT (#1001 and up, TIER II)
21074EL56

36. 4 -66
CONTROLLER CIRCUIT (#1001 and up, TIER II)
21074EL57

37. 4-67
MONTORING CIRCUIT (#1001 and up, TIERII)
21074EL58