Isuzu N-Series. Manual - part 1015

CAB AND CHASSIS ELECTRICAL 8-165

2. Actuator on the Left (Right) Side Inoperative

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

• IS THE ACTUATOR ON THE LEFT (RIGHT) SIDE

NORMAL?

• IS THERE CONTINUITY BETWEEN 6 B-155  

(6 B-152 ) AND THE GROUND?

YES

NO

REPLACE THE ACTUATOR

REPAIR A POOR CONNECTION AT THE CONNECTORS 
OR AN OPEN CIRCUIT BETWEEN  F-12  (10A) AND 
1 B-155  (1 B-152 )

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 6 B-155  (6 B-152 ) AND  B-7  

N8A0150E

• IS THE CONTINUITY IN THE HEADLIGHT LEVELING 

SW NORMAL?

• IS THE ACTUATOR ON THE LEFT (RIGHT) SIDE

NORMAL?

YES

NO

REPAIR OR REPLACE THE SWITCH

REPAIR A POOR CONNECTION AT THE CONNECTORS 
OR AN OPEN CIRCUIT
(REFER TO THE FOLLOWING PAGE)

YES

NO

REPLACE THE ACTUATOR

N8A0151E

8-166 CAB AND CHASSIS ELECTRICAL

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

Actuator - RH

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.

Installation
To install, follow the removal steps in the reverse order.

Headlight Leveling Actuator

Inspection
Apply the battery voltage to the connector terminals and
check its function.
This actuator has a mechanism that the angle of head-
light leveling varies according to input voltage of SIG-
NAL.

1. Make sure that the voltage specified in table is out-

put to vehicle harness connector which will be con-
nected to actuator.
If the power supply is not 12 V, the SIGNAL output
varies in proportion to its voltage.

2. Connect the connector of actuator and vehicle har-

ness connector.
Make sure that the reflector of headlight moves to
the position indicated by HEAD LAMP LEVELING
SW.

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

1

2

3

4

6

0

1

2

3

Terminal No.

SW
position

B-156

4 3

10 9 8 7

2 1

6 5

Switch side

N8A0152E

N8A5175E

B-152 B-155

Actuator side

3

1

2

N8A0154E

CAB AND CHASSIS ELECTRICAL 8-167

Caution:

1. For vehicles with 12 V and 24 V, this leveling input

voltage is 12 V.

2. Input to SIGNAL must be less than 65% of the in-

put voltage to positive terminal.

1

2

3

SIGNAL

−

+

Input signal 
voltage ratio 
for SIGNAL 
when the volt-
age difference 
between posi-
tive and nega-
tive is 
specified as 
100%

−

+

HEAD
LAMP
POSITION

Position
0

10.0% (1.2 V)

0 V

12 V

Position
1

23.4% (2.8 V)

0 V

12 V

Position
2

36.7% (4.4 V)

0 V

12 V

Position
3

50.0% (6.0 V)

0 V

12 V

Position
4

63.4% (7.6 V)

0 V

12 V

8-168 CAB AND CHASSIS ELECTRICAL

Clearance Light, Taillight, License Plate Light and Illumination Light

General Description

The circuit consists of the lighting switch, clearance light, taillight, license plate light and the illumination light for each
of switch, meter and ashtray.
All these lights come on when the lighting switch is turned on with the switch to either clearance or headlight position.

Lighting Circuit

N8A0156E