Isuzu N-Series. Service manual — part 1036
CAB AND CHASSIS ELECTRICAL 8-249
Circuit Diagram
B-11
B-11
B-11
B-11
B-11
B-69
B-69
B-69
B-69
B-69
B-69
B-9
B-9
B-9
B-9
B-9
B-9
B-8
B-8
B-7
B
ST
ACC
ON
B-67
B-67
P-1
P-2
P-3
P-4
P-5
(24V MODEL)
(12V)
2
3
8
3
6
7
4
2
B
PS
I
PM
W
E
B
P
4
5
2
3
LO
HI
1
3
8
7
4
6
1
P
OFF
I
H
W
L
1
2
HEADLIGHT BRACKET (LH)
3B
0.5B
0.5B(24V)
1.25B(12V)
0.5L/B
0.5BR/Y(24V)
0.85BR/Y(12V)
0.5L(24V)
1.25L(12V)
0.5L/B
0.5L/O(24V)
0.85L/O(12V)
0.5L/R(24V)
0.85L/R(12V)
0.5BR/W(24V)
0.85BR/W(12V)
0.5BR/R(24V)
1.25BR/R(12V)
WIPER, WASHER SW
(COMBINATION SW)
0.5L(24V)
0.85L(12V)
0.5L(24V)
1.25L(12V)
0.5L(24V)
3L
1.25L(12V)
3B/Y
3W/L
FL-1 60A or 100A(24V)
80A(12V)
MAIN
FL-2 40A(24V)
50A(12V)
KEY SW
STARTER SW
F-10 15A
WIPER, WASHER
WIPER MOTOR
WASHER MOTOR
0.5B
H-7
3W/B
1
RELAY; INTERMITTENT
FRAME
2L
P-3
P-4
4JH1
FUSE BLOCK
X-1
X-1
X-1
X-1
RELAY
TAIL ON
(24V)
X-11
X-11
X-11
X-11
RELAY
TAIL ON
0.5B
3W/L
5
2
3
1
5
2
3
1
N8A0252E
8-250 CAB AND CHASSIS ELECTRICAL
Connector List
No.
Connector Face
B-8
B-9
B-11
B-11
B-67
B-67
B-69
B-69
002-009
1
2
008-012
1
2
3
4
5
6
7
8
006-001
1
2
3
4
5
6
006-016
3
6
2
5
1
4
004-001
1
2
3
4
004-002
2
4
1
3
008-001
1
5
2
6
3
7
4
8
008-002
1
5
2
3
6
7
4
8
P-1
(12V)
P-2
P-1
(24V)
P-4
P-2
(24V)
P-3
P-5
(12V)
P-5
(24V)
No.
Connector Face
000-003
000-004
000-004
000-004
000-006
000-006
000-007
000-002
CAB AND CHASSIS ELECTRICAL 8-251
H-7
Diagnosis
Quick Chart for Check Point
1. Windshield Wiper and Washer
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
X-1
X-11
No.
Connector Face
005-006
005-006
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-10
(15A)
Wiper&
washer
SW
Intermitt
ent relay
Wiper
motor
Washer
motor
Cable
harness
Trouble
mode
1. Windshield wiper does not op-
erate at any switch position
❍
(1)
❍
(3)
❍
(4)
❍
(2)
2. Windshield wiper does not op-
erate at “INT” position
❍
(1)
❍
(3)
❍
(2)
3. Windshield wiper does not op-
erate at “LO” position
❍
(1)
❍
(3)
❍
(2)
4. Windshield wiper does not op-
erate at “HI” position
❍
(1)
❍
(2)
❍
(3)
5. Auto-stop function of the
windshield wiper motor does
not operate
❍
(1)
❍
(4)
❍
(2)
❍
(3)
6. Rotation of the windshield
wiper motor does not stop
❍
(1)
❍
(2)
7. Windshield washer motor
does not operate
❍
(1)
❍
(3)
❍
(2)
8-252 CAB AND CHASSIS ELECTRICAL
1. Windshield Wiper and Washer
1-1. Windshield Wiper Does Not Operate at Any Switch Position
• IS FUSE F-10 (15A) NORMAL?
NO
• DISCONNECT THE CONNECTOR OF THE WINDSHIELD
WIPER & WASHER SWITCH
• TURN THE STARTER SWITCH ON
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
SWITCH HARNESS SIDE CONNECTOR 1 B-69 AND THE
GROUND?
REPLACE THE FUSE
• DISCONNECT THE CONNECTOR OF THE WINDSHIELD
WIPER MOTOR WITH THE MOTOR CONNECTOR 2 B-11
CONNECTED TO THE BATTERY (+) TERMINAL, AND THE
CONNECTOR 1 B-11 TO THE (-) TERMINAL, DOES THE
MOTOR ROTATE AT A LOW SPEED?
• AND WITH THE CONNECTOR 3 B-11 CONNECTED TO
THE (+) TERMINAL, DOES THE MOTOR ROTATE AT A
HIGH SPEED?
GROUND IT SECURELY
YES
NO
• IS CONTINUITY IN THE WINDSHIELD WIPER & WASHER
SWITCH NORMAL?
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE FUSE F-10 (15A) AND 1 B-69
YES
NO
• IS B-7 GROUNDED SECURELY?
REPAIR OR REPLACE THE SWITCH
YES
NO
YES
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 1 B-11 AND B-7
REPAIR OR REPLACE THE WINDSHIELD WIPER
MOTOR
YES
N8A0254E
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