Isuzu N-Series. Manual - part 43

SERVICE INFORMATION 00-3

Fan Switch Troubleshooting

Current flows to the blower motor through the heater & A/C relay X-12 to activate the rotation of the blower motor by
turning “ON” the fan switch.
Blower motor speed is controlled in stages by the resistor, by operating the switch from “LOW” to “HIGH.”

For 12 Volt (LHD Model)

X-12

X-12

X-12

X-12

B-14

B-14

B-42

B-13

B-13

B-13

B-42

B-42

B-42

B-42

H-6

B-7

2

2

1

5

4

3

6

5

4

2

4

B-13

1

2

3

2

1

30B/R

8B

2L

8W

0.5W/R

3L

0.5B

2L/B

2L/B

2L/B

1.25L/O

0.85L/Y

0.5L/W

B-42

1

2L

2B

3B

2B(4JH1)

8W/B

3W/B

P-1

P-2

P-5

FRAME

FL-1  100A

RELAY;
HEATER & A/C

RELAY; CHARGE (5)

FL-25 30A

BLOWER
MOTOR

4

1

3

2

OFF

FAN SWITCH

BLOWER RESISTOR

A/C SWITCH

HEADLIGHT BRACKET (LH)

MAIN

HEATER

P-3

P-4

5B(4JH1)

B-1

FRAME-LH (FRONT)

5B

3B

1.25B

EXCEPT 4JH1

4JH1

N1A0214E

00-4 SERVICE INFORMATION

For 12 Volt (RHD Model)

X-12

X-12

X-12

X-12

B-14

B-14

B-13

B-42

B-13

B-13

B-13

B-42

B-42

B-42

B-42

H-6

B-1

B-7

2

1

2

5

4

3

6

5

4

2

4

2

3

1

2

1

30B/R

8B

8W/B

0.5W/R

3L

0.5B

2L/B

2L/B

1.25L/O

0.85L/Y

2B

B-42

1

2L

3B

3B

5B

2B

5W/B

3W/B

P-5

FRAME

FL-1  100A

RELAY;
HEATER & A/C

RELAY; CHARGE (1)

FL-25

BLOWER
MOTOR

4

1

3

2

FAN SWITCH

BLOWER RESISTOR

A/C SWITCH

HEADLIGHT BRACKET (LH)

FRAME-LH (FRONT)

MAIN

HEATER

2L

P-1

P-2

P-3

P-4

4JH1

30A

2B

2B

0.5G/Y

N1A0201E

SERVICE INFORMATION 00-5

For 24 Volt (LHD Model)

B-13

B-13

B-13

B-42

B-42

B-42

B-42

B-42

B-7

B-1

H-6

B-14

B-14

B-13

OFF

X-12

X-12

X-12

X-12

P-5

P-4

P-3

P-2

P-1

2

1

2

5

4

1

2

1

4

2

3

3

6

5

4

2

30B/R

8B

8W/B

2L

8W/B

3W/B

5W/B

0.5W/R

3L

0.85L

0.85L/B

0.5B

0.85B

2B

B-42

1

3B

5B

FRAME

FL-1  100A or 120A

F-1   15A

4

3

2

1

FAN SW

BLOWER RESISTOR

RELAY;
HEATER & A/C

RELAY; CHARGE (5)

FRAME-LH (FRONT)

HEADLIGHT BRACKET (LH)

MAIN

AIR CON, HEATER

BLOWER MOTOR

0.85L/B

0.5L/O

0.5L/Y

0.5L/W

0.85B

A/C SWITCH

N1A0216E

00-6 SERVICE INFORMATION

For 24 Volt (RHD Model)

B-13

B-13

B-13

B-42

B-42

B-42

B-42

B-42

B-7

B-1

H-6

B-14

B-14

B-13

OFF

X-12

X-12

X-12

X-12

P-5

P-4

P-3

P-2

P-1

2

1

2

5

4

1

2

1

4

2

3

3

6

5

4

2

30B/R

8B

2L

8W/B

3

W/B

5W/B

0.5W/R

3L

0.85L

0.85L/B

0.5B

2B

2B

B-42

1

3B

5B

FRAME

FL-1  100A or 120A

F-1   15A

4

3

2

1

FAN SW

BLOWER RESISTOR

A/C SWITCH

RELAY;
HEATER & A/C

RELAY; CHARGE (1)

FRAME-LH (FRONT)

HEADLIGHT BRACKET (LH)

MAIN

AIR CON, HEATER

BLOWER MOTOR

0.85L/B

*

0.5L/Y

0.5L/W

0.85B

*

EXCEPT 4HK1-TC ENGINE MODEL FOR AUSTRALIA: 0.85L/O
4HK1-TC ENGINE MODEL FOR AUSTRALIA: 0.5L/O

0.5G/Y

N1A0202E