Isuzu N-Series. Manual — part 998
CAB AND CHASSIS ELECTRICAL 8-97
4JH1 Engine (9)
A/C
Compressor
A/C ON
signal
relay
signal
Glow
relay
control
A/C
compressor
relay
control
Resistor
1
B-339
2
B-339
0.5
GRN/
YEL
0.5
GRN/
YEL
0.5
GRN/
YEL
0.5
BLK/
RED
0.5
BLK
2
5
X-26
X-26
A/C
Signal
Relay
3
BLK/
RED
0.3
BLK/
RED
5
2
X-20
Glow
Relay
Glow
Plug
0.85
GRN/
YEL
0.85
GRN/
YEL
0.5
WHT/
GRN
0.5
BLK
0.85
BLK
0.5
WHT/
GRN
2
5
X-24
X-24
A/C
Compressor
Relay
16
H-8
3
H-8
H-8
1
H-14
ECM
J-9
Frame
B-1
Frame
41
B-234
33
94
B-233
SBF-3
Glow
60A
4
3
X-20
1
J-122
15
4
1
4
1
Fuse & Relay Box
(Behind the Cab)
F-1
AIR CON
10A
SBF-25
HEATER
30A
0.5
BLU/
RED
0.5
GRN/
ORN
USW
JOINT2
W/S-C
0.5
PNK/
GRN
0.85
GRN/
WHT
1.25
L
T
GRN/
BLK
0.85
BRN
5
1
4
2
X-10
X-10
A/C
Thermo
Relay
0.5
BLU/
RED
3
H-18
J-6
J-6
12
Pressure
Switch
Diode
Electro
Thermo
4
H-18
0.5BLU/RED
2
BLU
1.25
BLU
ECM
Main Relay
1
H-6
Fuse &
Relay Box
(Glove Box)
Relay Box
(Instrument
Panel)
EGR Solenoid V
alve
PCU
Exhaust Brake
Solenoid V
alve
Intake Throttle
Solenoid V
alve
0.5
BLU /
RED
N6A3871E
8-98 CAB AND CHASSIS ELECTRICAL
4JH1 Engine (10)
0.5
BLU/
RED
USW
JOINT2
3
BLU/
RED
0.5
YEL
0.5
WHT/
BLK
0.5
GRN
0.5
BLU/
RED
0.5
BLU/
RED
0.5
GRN/
YEL
0.5
GRN
4
1
3
2
B-66
Brake
Switch
2
1
8
7
6
3
1
2
B-89
B-89
Clutch
Switch
ECM
EHCU
(ABS
Module)
65
Stop
Light
F-5
ST
OP
LIGHT
10A
31
ECM
Main
Relay
Glow
Relay
1
H-6
30
0.5
L
T
GRN
0.5
BLK
2
1
J-31
J-31
40
0.5
L
T
GRN/
WHT
0.5
BLU/
RED
2
1
J-40
J-40
95
Intake
Throttle
Solenoid
V
alve
Exhaust
Brake
Solenoid
V
alve
MAF Sensor
EGR Solenoid V
alve
A/C Compressor Relay
A/C Signal Relay
9
32
H-5
0.5
L
T
GRN
0.5
L
T
GRN/
WHT
B-234
0.5
L
T
GRN/
BLU
0.5
BLU/
RED
2
1
B-69
B-69
Exhaust
Brake
Switch
64
IPC
12V
Brake
pedal
switch1
signal
Exhaust
brake
switch
signal
Clutch
switch
signal
Brake
pedal
switch2
signal
Intake
throttle
solenoid
valve
control
Exhaust
brake
solenoid
valve
control
Fuse &
Relay Box
(Glove Box)
J/C-E
PCU
Idle
Switch
Resistor
Engine
W
arm Up
Switch
8
7
10
1
1
H-14
0.5
L
T
GRN/
WHT
0.5
L
T
GRN/
WHT
0.5
L
T
GRN/
BLK
0.5
L
T
GRN/
BLK
62
32
B-234
J-177
0.5
L
T
GRN/
BLK
0.5
L
T
GRN/
WHT
36
40
H-5
12V
Exhaust
brake
cut
signal
input
Exhaust
brake
cut
signal
feedback
input
Exhaust
brake
cut
signal
feedback
output
Exhaust
brake
cut
signal
output
0.5
L
T
GRN/
BLU
12V
N6A3872E
Neutral
switch
signal
Resistor
B-342
B-342
0.3
BLK
0.5
BLK/
WHT
0.5
BLK/
WHT
0.5
BLK/
WHT
2
1
J-50
J-50
Neutral
Switch
9
H-8
87
B-233
W/S-C
0.5
BLU/
RED
1
2
CAB AND CHASSIS ELECTRICAL 8-99
4HK1-TC Engine (1)
SBF-2
KEY
40A
SBF-1
MAIN
100A or 120A
2L
30
BLK/
RED
8 BLK
0.3
GRN/
ORN
3
WHT/
BLK
F-1
HEATER,
AIR CON
15A
Heater &
A/C Relay
1
2
X-12
5
4
X-12
F-2
FUEL
HEATER
10A
F-7
TAIL
LIGHT
10A
Heater
Relay
1
2
X-8
5
4
X-8
Tail
Relay
1
2
X-4
5
4
X-4
Charge
Relay
3
BLK/
RED
3
BLU
5
WHT
5
WHT/
BLK
8
WHT/
BLK
3
WHT/
BLK
3
WHT/
BLK
0.5
WHT/
RED
0.5 WHT/RED
3
WHT
F-22
STARTER
10A
F-9
ENG.
(IG)
10A
F-16
METER
10A
3
BLK/
YEL
W/S-H
W/S-E
USW
JOINT 3
3
BLK/
YEL
3
BLK
0.5
BLK
2
BLK
0.5 BLK
B-67
4
H-6
2
H-7
1
SBF-3
GLOW
60A
3
BLK/
BLU
0.5
BLK
3
WHT/
RED
1.25
RED
Glow
Plug
Relay
3
4
X-20
2
5
X-20
SBF-8
STARTER
60A
Fuse &
Relay Box
(Behind
the Cab)
Fuse &
Relay Box
(Behind
the Cab)
Fuse &
Relay Box
(Glove Box)
Relay Box
(Instrument
Panel)
Relay Box
(Instrument
Panel)
Fuse &
Relay Box
(Glove Box)
Fuse &
Relay Box
(Glove Box)
SBF-5
ECM
40A
ECM
Main
Relay
Starter
Relay
ECM
ECM
Combination
Switch
Glow
Plug
ECM
0.5
BLU/
BLK
2
RED
0.5
BLK/
RED
3
BLK/
YEL
3
WHT/
BLK
2
BLK
J-9
Frame
2
ST
ON
ACC
OFF
B-67
3
B-67
Ignition
Switch
Fuse &
Relay Box
(Behind the Cab)
P-5
B-7
H/L
Bracket
6
J/C-D
1
Battery
P-1
P-2
P-3
P-4
N6A6628E
0.5
YEL/
BLK
3
5
X-18
2
4
X-18
F-28
ECM
10A
8-100 CAB AND CHASSIS ELECTRICAL
4HK1-TC Engine (2)
ECM
TCM
30 BLK/RED
8 BLK
8 BLK
8 BLK
3 BLK/YEL
P-1
P-2
P-3
P-4
Battery
P-5
3
BLK/
WHT
3
WHT/
BLK
0.5
RED/WHT
0.5
RED/WHT
0.5
RED
0.5
WHT/
BLU
0.3
BLK/WHT
3
WHT/BLU
3
WHT/BLU
2L
SBF-8
ST
AR
TER
60A
SBF-2
KEY
40A
F-22
ST
AR
TER
10A
14
H-8
0.5
RED/
WHT
0.5
WHT/
BLU
0.5
WHT/
BLU
J-9
Frame
1
H-7
4
B-67
USW
JOINT
3
2
BLK
0.5
BLK
14
J-191
B-425
46
Start cut
relay
control
Start switch
signal
38
H-5
16
Starter
cut
relay
control
Fuse &
Relay Box
(Glove Box)
F-28
ECM
10A
Fuse &
Relay Box
(Behind the Cab)
2
B-67
2
3
J/C-2
0.85
L
T
GRN
0.5
L
T
GRN
ECM
Main Relay
5
2
X-21
4
3
X-21
5
1
X-26
3
4
X-26
ST
ON
ACC
OFF
Ignition
Switch
N6A6629E
Starter
B
C
1
J-27
1
J-26
Fuse &
Relay Box
(Behind
the Cab)
Starter
Relay
Fuse &
Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Behind the Cab)
Starter Cut
Relay
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