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
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