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