GROUP 2 ELECTRICAL CIRCUIT
7-3
CAB SIDE TRANSMISSION HARNESS FRONT SIDE
GAUGE SIDE FRAME SIDE
7-4
1. ILLUMINATION CIRCUIT
1) OPERATING FLOW
Fuse box (No.20) Illumination switch [CS-39(1)] Switch ON, 1st step
[CS-39(7)] Hazard and illumination switch indicator lamp ON
[CS-39(5)] Fuse box(11) I/conn [CN-3(8)] RH Combi clearance lamp ON [CL-16(4)]
I/conn [CN-10(1)] LH Head lamp ON [CL-3(4)]
I/conn [CN-7(14)] All cluster guage lamp ON
Fuse box(12) I/conn [CN-3(7)] No. plate lamp ON [CL-21(2)]
LH Combi clearance lamp ON [CL-15(4)]
I/conn [CN-10(2)] RH Head lamp ON [CL-4(4)]
2) CHECK POINT
Engine Key switch Check point Voltage
ڸ- GND (Switch input)
ڹ- GND (Switch output)
OFF ON 20~25V
ں- GND (To light)
ڻ- GND (To gauge lamp)
Ɠ GND : Ground
7-5
ILLUMINATION CIRCUIT
FUSE BOX
LH HEAD LIGHT
2
ILL & HEAD LAMP SW
RH HEAD LIGHT
3
3
NUMBERPLATE LAMP
1
RH COMBI
3
LH COMBI
SPEED METER
T/M TEMP
WATER TEMP
HAZARD SW
VOLT METER
FUEL METER
7-6
2. HEAD LIGHT CIRCUIT
1) OPERATING FLOW
Fuse box(No.19) Head light switch [CS-39(4)] Light switch ON, 2nd step [CS-39(2)]
Multi function switch [CS-11(8)]
Multi function switch MIDDLE [CS-11(7)] I/conn [CN-10(4)] 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-10(3)] 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 20~25V
ڼ- GND (Multi function output)
ڽ- GND (Low beam)
ھ- GND (High beam)
ڿ- GND (Passing B+)
Ɠ GND : Ground
7-7
HEAD LIGHT CIRCUIT
FUSE BOX
ILL & HEAD LAMP SW LH HEAD LIGHT
RH HEAD LIGHT
HI BEAM PILOT LAMP
6
4
EARTH
3
5 8
MULTI FUNCTION SW
7-8
3. WORK LIGHT SWITCH
1) OPERATING FLOW
Fuse box(No.17) Work light switch [CS-21(5)] Work light switch ON [CS-21(1)]
I/conn [CN-5(4)] LH Front work lamp ON [CL-6(2)]
RH Front work lamp ON [CL-5(2)]
Work light switch [CS-21(6)] Work light switch ON [CS-21(2)]
I/conn [CN-5(3)] LH Rear work lamp ON [CL-22(2)]
RH Rear work lamp ON [CL-23(2)]
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 20~25V
ں- GND (Front work light)
ڻ- GND (Rear work light)
Ɠ GND : Ground
7-9
WORK LIGHT SWITCH
FUSE BOX
1 1
WORK LAMP SW
3
FRONT WORK
LIGHT,LH
FRONT WORK
2 LIGHT,RH
3
4
REAR WORK
LIGHT,LH
REAR WORK
LIGHT,RH
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.13) Start switch [CS-2(1)]
Ɠ The EGS lever is neutral position. It is necessary condition before the starting.
The EGS 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(1)] Battery relay [CR-1]
Battery relay operating(All power is supplied with the electric component)
Start switch [CS-2(3)] Fuse box [No.4] I/conn [CN-2(8)]
I/conn [CN-4(9)] Engine stop solenoid [CN-79(1)]
(2) When start key switch is in START position
Start switch START [CS-2(5)] Start safety relay [CR-5(2)] Start safety relay [CR-5(4)]
I/conn [CN-3(3)] I/conn [CN-4(7)] Start relay [CR-23(2)]
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(1))
Running ON 20~25V
ڽ- GND (Start key R2 terminal)
ھ- GND (Start safety relay output)
ڿ- GND (Check unit)
ۀ- GND (Start key IG terminal)
ہ- GND (Engine stop solenoid)
Ɠ GND : Ground
7-11
STARTING CIRCUIT
CHECK UNIT
EGS
FUSE BOX
8
SAFETY RY
PROLIX SW
1
MASTER SW
BATT RY
60R 60R 60B 60B
NEUTRAL RY
STARTER
START RY
9 4
6 3
ENG STOP SOL
START SWITCH
EMER TRAVEL
SWITCH 10
7-12
5. ENGINE STOP CIRCUIT
1) OPERATING FLOW
Start key OFF [CS-2(3)] Fuse box (No.4) I/conn [CN-2(8)] I/conn [CN-4(9)]
Engine stop solenoid OFF [CN-79(1)]
2) CHECK POINT
Engine Key switch Check point Voltage
ۀ- GND (Start key IG terminal)
OFF OFF 0V
ہ- GND (Engine stop solenoid)
Ɠ GND : Ground
3) WIRING DIAGRAM - See page 7-12.
7-13
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(I)] I/conn [CN-4(3)] I/conn [CN-2(2)] Check unit [CN-58(2)ơ(18)]
I/conn [CN-6(1)] Cluster charge warning lamp ON [CL-46(1), Below 24V]
JT-27(4)ơ(10) Volt meter [CN-104(B)]
(2) Charging flow
Alternator Starter [CN-45(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)
ں- GND (ALT B+)
Running ON 20~28V
ڻ- GND (ALT I)
ڼ- GND (Check unit)
ڽ- GND (Fuse box)
Engine Key switch Check point Resistance
Running ON ھ- GND (Cluster) ſװ
Ɠ GND : Ground
7-14
CHARGING CIRCUIT
FUSE BOX
CHECK UNIT
CHARGE
2 1
MASTER SW
BATT RY
60R 60R 60B 60B
VOLT METER
7
6
STARTER
ALTERNATOR
7-15
7. ELECTRIC PARKING, DECLUTCH CIRCUIT
1) OPERATING FLOW
(1) Parking OFF
Fuse box (No.6) Parking switch OFF [CS-17(6)(آ8)] I/conn [CN-8(3)]
Parking solenoid ON(Activated) Parking brake released(By hydraulic pressure)
(2) Parking ON
Fuse box (No.6) Parking switch ON Parking solenoid [CN-71] OFF
Parking brake applied [By spring force]
[CS-17(6)(آ2)] Parking switch indicator lamp ON
[CS-17(5)(آ1)] I/conn [CN-15(4)]
EGS [CN-111(14)] T/M declutch
(3) Declutch ON
Fuse box (No.6) 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(4)] Declutch
Clutch oil pressure switch
2) CHECK POINT
Engine Key switch Check point Voltage
ڸ- GND (Parking switch input)
ڹ- GND (Parking switch output)
ں- GND (Parking switch input)
Running ON ڻ- GND (Parking switch output) 20~25V
ڼ- GND (Parking solenoid)
ڽ- GND (Clutch cut-off press switch)
ھ- GND (Declutch input signal)
Ɠ GND : Ground
7-16
ELECTRIC PARKING, DECLUTCH CIRCUIT
EGS
CHECK UNIT FUSE BOX
PROLIX SW
NEUTRAL RY
7
2 1 3
PARKING SW
4 5
PARK SOL
6
CLUTCH CUT-OFF SW
CLUTCH EMER TRAVEL
CUT-OFF SWITCH
7-17
8. WIPER AND WASHER CIRCUIT
1) OPERATING FLOW
Fuse box (No.7) Wiper relay [CR-4(1)(آ3)] Front wiper motor [CN-21(1)]
Front relay 2 [CR-26(2), (3)]
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 2
[CR-26(2)(آ4)] 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)] Wiper relay
[CR-26(2)(آ4)] Wiper motor [CN-21(5)] Wiper motor intermittently operating
ڹLo position
Wiper switch ON [CS-12(6)(آ4)] Wiper motor [CN-21(5)] Wiper motor operating (Low)
ںHi position
Wiper switch ON [CS-12(6)(آ3)] Wiper relay [CR-4(1)(آ4)] Wiper motor [CN-21(4)]
Wiper motor operating(High)
(3) Auto-parking(When switch OFF)
Wiper motor [CN-21(5)] OFF Fuse box (No.7) Wiper relay [CR-4(4)(آ3)]
Wiper relay 2 [CR-26(3)] Wiper motor [CN-21(1)(آ2)] Wiper motor stop
(4) Rear wiper and washer switch
ڸWiper switch ON(1st step)
Wiper switch ON [CS-3(1)(آ6)] Wiper motor [CN-102(5)] Wiper motor operating
Rear wiper and washer switch indicator lamp ON
ڹWasher switch ON(2nd step)
Washer switch ON [CS-3(1)(آ3)] Rear washer tank [CN-103(2)] Washer operating
2) CHECK POINT
Engine Key switch Check point Voltage
ڸ- GND (Front wiper switch power input)
ڹ- GND (Rear wiper switch power input)
ں- GND (Wiper relay power input)
ڻ- GND (Front wiper motor Lo power input)
ڼ- GND (Front wiper motor High power input)
Stop ON 20~25V
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
WIPER AND WASHER CIRCUIT
REAR WIPER CHECK UNIT FUSE BOX
WIPER RY2
3
WIPER RY
9
1 7 5
8 4
10
2
F/WASHER
R/WASHER
FRONT WIPER
REAR WIPER & WASHER SW
MULTIFUNCTION SWITCH
7-19
MONITORING CIRCUIT
BRK OIL T/M TEMP
CHECK UNIT
AIR FILTER
WATER TEMP
ENG OIL
OVER HEAT
HYD TEMP
FUEL METER
PARKING
T/M OIL TEMP
FUEL SENDER
AIR FILTER
ENG OIL PRESS
OVER HEAT SW
WATER TEMP
HYD TEMP SW PARKING PS BRAKE OIL PS
7-20
HAZARD, TURN AND ROTARY CIRCUIT
COMBI LAMP RH ROTARY LAMP
FUSE BOX
COMBI LAMP LH
FLASHER UNIT
RH TURN LAMP,RR
LH TURN LAMP,RR
EARTH
LH TURN LAMP,FR
RH TURN LAMP,FR
BEACON LAMP SW HAZARD SW MULTIFUNCTION SWITCH
7-21
