Isuzu N-Series. Manual — part 1014
CAB AND CHASSIS ELECTRICAL 8-161
Circuit Diagram
For 12 Volt
P-1
P-2
FL-1
100A(12V)
MAIN
B
ST
ACC
ON
STARTER SW
B-67
1
H-7
P-5
FRAME
FL-2
50A(12V)
KEY SW
3W/L
3W/L
3W/B
2
3
B-67
F-12
10A
H/LAMP LEVEL
0.5R/W
2L
P-3
P-4
4JH1
RELAY; KEY ON
3L
0.5B
3B/Y
3B/Y
X-1
X-1
X-1
X-1
ACG B
2L
FUSE BLOCK
2
B-421
3
B-421
4
B-421
5
B-421
6
0.5O/G
0.5O/B
0.5O/W
0.5O/L
0.5O
B-421
1
B-421
14
B-421
4
B-156
10
B-156
6
B-156
7
3
2
4
0
1
B-156
8
B-156
9
B-156
R5
R6
RESISTOR;
H/L LEVELING
R4
R3
R2
R1
0.5R/W
0.5R/W
0.5B
1
B-155
3
B-155
2
0.5B
0.5B
B-155
ACTUATOR; HLL (LH)
(DR SIDE HEAD LAMP)
1
B-152
3
B-152
2
B-152
ACTUATOR; HLL (RH)
(AS SIDE HEAD LAMP)
0.5R/W
0.5R/Y
0.5R/Y
SW; H/L LEVELING
1
3
2
5
N8A0148E
8-162 CAB AND CHASSIS ELECTRICAL
For 24 Volt
P-1
P-2
FL-1
100A or 120A
MAIN
B
ST
ACC
ON
STARTER SW
B-67
1
H-7
FL-2
40A
KEY SW
3W/L
3W/L
3W/B
5W/B
3W/B
2
3
B-67
F-12
10A
H/LAMP LEVEL
2L
RELAY; KEY ON
3L
0.5B
3B/Y
3B/Y
X-11
X-11
X-11
X-11
ACG B
FUSE BLOCK
P-3
P-4
P-5
FRAME
2
B-421
3
B-421
4
B-421
5
B-421
6
0.5O/G
0.5O/B
0.5O/W
0.5O/L
0.5O
B-421
1
B-421
14
B-421
1
B-420
6
B-420
3
B-420
2
B-420
4
B-156
10
B-156
6
B-156
7
3
2
4
0
1
B-156
8
B-156
9
B-156
R5
R6
RESISTOR;
H/L LEVELING
R4
R3
R2
R1
0.5R/W
0.5B/W
1
B-155
3
B-155
2
B-155
ACTUATOR; HLL (LH)
(DR SIDE HEAD LAMP)
1
B-152
3
B-152
2
B-152
ACTUATOR; HLL (RH)
(AS SIDE HEAD LAMP)
0.5R/W
0.5B/W
0.5R/Y
0.5R/Y
SW; H/L LEVELING
CONVERTER;
DC-DC(HLL)
0.5L/O
0.5R/W
0.5B/W
1
3
2
5
N8A0388E
CAB AND CHASSIS ELECTRICAL 8-163
Connector List
H-7
No.
Connector Face
B-7
B-67
B-67
B-152
B-155
B-156
P-1
P-2
000-012
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
000-004
000-003
P-5
B-420
(24 V)
B-421
X-1
(12V)
X-11
(24 V)
No.
Connector Face
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
005-006
005-001
1
3
2
4
5
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
8-164 CAB AND CHASSIS ELECTRICAL
Diagnosis
Quick Chart for Check Points
1. Both Actuators Inoperative
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
❍
❍
❍
• 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
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