Isuzu N-Series. Manual — part 1024
CAB AND CHASSIS ELECTRICAL 8-201
H-5
J-5
P-1
(12 V)
P-2
P-1
(24 V)
P-4
P-2
(24 V)
P-3
P-5
(12 V)
No.
Connector Face
001-018
1
000-003
000-004
000-004
000-004
000-006
000-006
000-007
P-5
(24 V)
R-1
R-1
R-6
R-6
No.
Connector Face
000-002
006-004
1
2
3
4
5
6
006-005
3
2
1
6
5
4
006-004
1
2
3
4
5
6
006-005
3
2
1
6
5
4
1
2
3
7
8
9
13
14 15
19
20 21
25
26 27
31
32 33
34
35
36
37
4
5
6
10
11 12
16
17 18
22
23 24
28
29 30
38
39 40
6
5
4
12
11 10
18
17 16
24
23 22
30
29 28
40
39 38
3
2
1
9
8
7
15
14 13
21
20 19
27
26 25
33
32 31
34
35
36
37
N8A5488E
8-202 CAB AND CHASSIS ELECTRICAL
H-6
Diagnosis
Quick Chart for Check Point
1. Horn
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
2. Backup Light
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
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-19, F-20
(15 A)
Horn
Horn SW
Horn
relay
Horn
contact
Cable
harness
Trouble
mode
1-1. Horn does not sound
❍
(1)
❍
(4)
❍
(6)
❍
(2)
❍
(5)
❍
(3)
1-2. Horn does not shut off
❍
(2)
❍
(1)
❍
(3)
Check point
Fuse
F-16 (10 A)
Backup light
SW
(Inhibitor SW)
Backup
light bulb
Backup
buzzer
Cable
harness
Trouble
mode
2-1. Both backup lights inoperative
❍
(1)
❍
(3)
❍
(2)
2-2. Backup light on the left (or right)
side inoperative
❍
(1)
❍
(2)
2-3. Backup light remains on
❍
(1)
CAB AND CHASSIS ELECTRICAL 8-203
1. Horn
1-1. Horn Does Not Sound
• IS FUSE F-19 , F-20 (15A) NORMAL?
YES
NO
REPLACE THE FUSE
• IS THE HORN RELAY NORMAL?
• IS THE HORN NORMALLY GROUNDED?
YES
NO
REPLACE THE HORN RELAY
• IS THE HORN CONNECTOR 1 J-4 OR 1 J-5
SECURELY CONNECTED?
YES
NO
CLEAN UP THE FITTING SURFACE AND THE
GROUND FIRMLY
• DISCONNECT THE HORN SWITCH CONNECTOR
• IS THERE BATTERY VOLTAGE APPLIED BETWEEN
3 B-70 AND THE GROUND?
YES
NO
CONNECT THE CONNECTOR SECURELY
• IS THERE ANY CONTINUITY BETWEEN THE HORN
RELAY HARNESS SIDE CONNECTORS 5 X-2 AND
1 J-4 (OR 1 J-5 )?
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT OR REPAIR
A POOR CONNECTION AT THE HORN
CONNECTOR
YES
NO
DOES THE HORN SOUND WHEN CONNECTING THE
BATTERY (+) TERMINAL TO THE HORN CONNECTOR
1 J-4 (1 J-5 ), AND (-) TERMINAL TO THE HORN
BRACKET?
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN THE
CIRCUIT
PEPLACE THE HORN
N8A0187E
8-204 CAB AND CHASSIS ELECTRICAL
1-2. Horn Does Not Shut Off
2. Backup Light
2-1. Backup Lights Inoperative
• IS THE HORN RELAY NORMAL?
• REMOVE THE HORN SW
• IS THE MOVABLE PORTION OF THE HORN SW
ALWAYS OUT OF CONTACT WITH THE GROUND
BRACKET?
YES
NO
REPLACE THE HORN RELAY
REPAIR A SHORT CIRCUIT BETWEEN HORN RELAY
HARNESS SIDE CONNECTORS 4 X-2 AND 3 B-70
YES
NO
REPAIR OR REPLACE THE HORN SW
N8A0188E
• IS FUSE F-16 (10A) NORMAL?
• IS J-9 SECURELY GROUNDED?
YES
NO
REPLACE THE FUSE
• TURN THE STARTER SW ON
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
BACKUP LIGHT SWITCH HARNESS SIDE CONNECTOR
1 E-10 (OR 1 J-49 )AND THE GROUND?
YES
NO
GROUND IT SECURELY
• ENTER THE TRANSMISSION SHIFT LEVER TO
REVERSE POSITION
• WHEN REMOVE THE CONNECTOR OF THE BACKUP
LIGHT SWITCH, IS THERE ANY CONTINUITY
BETWEEN THE SW SIDE CONNECTORS 1 E-10 AND
2 E-10 (OR 1 J-49 AND 2 J-49 )?
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE F-16 (10A) AND 1 E-10 OR 1 J-49
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE BACKUP LIGHT
SWITCH HARNESS SIDE CONNECTORS 2 E-10
(OR 2 J-49 )AND 4 H-16
YES
NO
REPAIR OR REPLACE THE BACKUP LIGHT
SWITCH OR INHIBITOR SW
N8A0189E
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