Isuzu N-Series. Service manual — part 1023
CAB AND CHASSIS ELECTRICAL 8-197
Horn, Backup Light and Backup Buzzer
General Description
The circuit consists of the starter switch, horn, horn switch, backup light (Rear combination light), backup light switch,
back buzzer and the relay.
When the horn switch is turned on independent of the position of the starter switch, the relay is activated to sound the
horn. When the backup light switch turns on with the starter switch on, the backup light will operate.
Backup Light and Backup Buzzer Circuit
N8A5216E
8-198 CAB AND CHASSIS ELECTRICAL
Parts Location
X-2
J-49 (55, 69)
F-16, F-19, F-20
N8A0184E
CAB AND CHASSIS ELECTRICAL 8-199
Circuit Diagram
ON
ACC
ST
B
J-5
J-4
H-5
X-2
X-2
X-2
X-2
B-67
B-67
H-5
J-49
J-49
R-1
R-1
B-70
R-6
J-9
H-7
P-1
P-2
P-3
P-4
P-5
1
H-16
7
2
3
22
1
2
5
6
5
6
3
1
1
3
4
5
12
5W(24V)
8W(12V)
0.5G
3W/L
3B/Y
0.5G
0.5G/R
0.5B/Y
0.5B/Y
0.5R/L
1.25B
1.25B
0.5G/W
1.25B
2B
MAIN
STARTER SW
F-19
15A :4JH1, 4JB1, 4JB1-TC
F-20
15A :24V, 4HG1-T(12V)
HORN, HAZARD
FRAME
RELAY; HORN
HORN (LH)
FRAME-LH (CENTER)
HORN SW
(COMBINATION SW)
F-16 10A
METER
METER B-51 (8)
BACKUP LIGHT
SW
FL-1
100A or 120A(24V)
100A(12V)
KEY SW
FL-2
40A(24V)
50A(12V)
(24V MODEL)
H-6
5W
0.5R/L
HORN CONTACT
(EXCEPT DUMP VEHICLE)
2
BACKUP LIGHT
(REAR COMBINATION LIGHT-RH)
BACKUP LIGHT
(REAR COMBINATION LIGHT-LH)
(EXCEPT DUMP VEHICLE)
HORN (RH)
R-6
3W/B
H-16
6
J-65
J-65
5
6
BACKUP LIGHT
(REAR COMBINATION LIGHT-LH)
(DUMP VEHICLE)
0.5B/Y
0.5R/L
2L
P-3
P-4
4JH1
N8A0185E
8-200 CAB AND CHASSIS ELECTRICAL
Connector List
No.
Connector Face
X-2
B-70
B-70
E-10
E-10
J-49
J-49
H-14
005-006
014-002
1 2 3
7 8 9 10
11
4
12
5
13
6
14
014-003
6 5 4
1413 12 11
3 2 1
9 8 7
10
002-025
1 2
002-026
2 1
002-025
1 2
002-026
2 1
016-003
1
2
3
4
5
6
7
8
9
11 12 13 14
15
16
10
H-14
H-16
H-16
J-62
J-62
J-65
J-65
J-4
No.
Connector Face
016-004
4
3
2
1
9
8
7
6
5
13 12 11 10
16
15
14
008-003
1
2
3
4
5
6
7
8
008-004
4
3
2
1
8
7
6
5
006-010
1
2
3
4
5
6
006-015
1
2
3
4
5
6
006-010
1
2
3
4
5
6
006-015
1
2
3
4
5
6
001-018
1
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