Isuzu N-Series. Manual - part 1115

8-172 CAB AND CHASSIS ELECTRICAL

Connector List

No.

Connector Face

B-67

B-67

B-152

B-155

B-156

X-1

X-11

P-1

004-001

1

2

3

4

004-002

2
4

1
3

003-016

3

1

2

003-016

3

1

2

010-002

5

2

1

6

7

8

9

4

3

10

005-006

005-001

1

3

2

4

5

000-003

P-2

P-5

B-420

(24 V)

B-421

B-xxx

B-xxx

No.

Connector Face

000-004

000-007

006-019

4

5

6

1

2

3

014-002

1 2 3

7 8 9 10

11

4

12

5

13

6

14

006-002

1

3 4 5 6

2

006-003

2

6 5 4 3

1

CAB AND CHASSIS ELECTRICAL 8-173

H-7

Diagnosis

Quick Chart for Check Points

1

2

1

2

1 2 3 4

5 6 7 8

9 10 11 12 13

14 15 16 17 18

2

1

2

1

4 3 2 1

8 7 6 5

13 12 11 10 9

18 17 16 15 14

H - 6

H - 7

H - 8

N8A5489E

Check point

Fuse

F-12 (10 A)

Headlight 

leveling 

switch

Headlight 

leveling 

actuator

Cable 

harness

Trouble
mode

1. Both actuators inoperative

❍

❍

❍

2. Actuator on the left (right) side inop-
erative

❍

❍

3. When leveling SW is turned to a 
certain position, actuator inoperative

❍

❍

❍

8-174 CAB AND CHASSIS ELECTRICAL

1. Both Actuators Inoperative

2. Actuator on the Right (Left) Side Inoperative

• IS FUSE  F-12  (10A) NORMAL?

• IS  B-7  GROUNDED SECURELY?

YES

NO

REPLACE THE FUSE

• TURN THE STARTER SW TO ON POSITION

• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE

FUSE TERMINAL AND THE GROUND?

YES

NO

GROUND IT SECURELY

• IS THE CONTINUITY IN THE HEADLIGHT LEVELING 

SW NORMAL?

YES

NO

REPAIR AN OPEN CIRCUIT BETWEEN STARTER
SW AND FUSE  F-12  (10A)

• IS THERE CONTINUITY BETWEEN 6 B-156  AND THE

GROUND?

YES

NO

REPAIR OR REPLACE THE SWITCH

REPAIR A POOR CONNECTION AT THE CONNECTORS 
OR AN OPEN CIRCUIT BETWEEN FUSE  F-20  AND 
1 B-155  (1 B-152  )

YES

NO

REPAIR AN OPEN CIRCUIT BETWEEN
6 B-156  AND  B-7  

N8A0149E

N8A5170E

CAB AND CHASSIS ELECTRICAL 8-175

3. When Headlight Leveling SW is Turned to A Certain Position, Actuator Inoperative

Inspect and repair the circuit that is corresponding to the
headlight leveling switch position where the actuator be-
comes inoperative.
Actuator - RH

Actuator - LH

Starter Switch

Refer to “START AND CHARGING” in this manual.

Headlight Leveling Switch

Inspection
Check the continuity between the switch connector ter-
minals.
Repair or replace the switch when the result of inspec-
tion is found abnormal.

Removal
Preparation:
Disconnect the battery ground cable.

1. Switch Bezel
2. Headlight Leveling Switch

Disconnect the connector.

N8A5171E

Headlight leveling 

SW position

Circuit

1

Between 3 

 and 3 

2

Between 2 

 and 4 

3

Between 1 

 and 5 

0

Between 4 

 and 2 

Headlight leveling 

SW position

Circuit

1

Between 3 

 and 3 

2

Between 2 

 and 4 

3

Between 1 

 and 5 

0

Between 4 

 and 2 

B-156

B-155

B-156

B-155

B-156

B-155

B-156

B-155

B-156

B-152

B-156

B-152

B-156

B-152

B-156

B-152

N8A5174E