Isuzu N-Series. Service manual — part 1043
CAB AND CHASSIS ELECTRICAL 8-277
Circuit Diagram
Except 4JH1 / 4HK1 Engine
B-51
B-52
0.3BR/Y
0.3BR
B-52
3
0.5W/L
RELAY; CHARGE (5)
B-85
B-85
B-51
14
2
1
0.3W/B
0.5B
0.5B/Y
0.3W/B
0.3W/B
0.3W/B
0.3W/B
0.3B
SHORT CONNECTOR (WITH HBB)
RELAY;
BUZZER CANCEL
BRAKE FLUID SWITCH
3B
11
3
5
X-13
X-13
X-13
X-13
2
4
1
HBB LEVEL
SW
J-128
J-128
2
J-128
J-128
4
12
TACHOMETER
SPEEDOMETER
CHARGE
SEAT BELT (SAUDI ARABIA)
GLOW
COOLANT
TEMPERATURE GAUGE
TURN - RH
BOOST
TURN - LH
HIGH BEAM
EXHAUST BRAKE
SPEED WARNING
(SAUDI ARABIA)
VACUUM
BRAKE FLUID LEVEL
ILLUMINATION (X5)
WATER
SEDIMENTER
OIL PRESSURE
BUZZER
REAR FOG
H-14
H-14
E-2
E-2
H-5
H-5
B-52
B-52
39
38
10
9
1
2
ENGINE
SPEED
SENSOR
0.3L/O
0.5B/L
9
8
H-5
H-14
E-7
B-55
4
23
6
1
0.3Y/B
FUEL GAUGE
FUEL LEVEL
J-28
J-28
3
B-55
B-51
H-5
H-5
10
5
14
21
2
1
J-28
0.3BR/R
0.3Y/R
B-55
H-5
J-32
J-32
B-55
H-5
B-52
H-5
B-55
J-32
7
2
31
19
31
25
2
1
3
0.85B
0.3Y/G
0.3B/Y
0.5B
WATER SEDIMENTER SW
SEAT BELT SW
N-5
N-5
H-12
3B
B-51
H-12
2
10
3
4
3
1
5
1
0.5B
0.3W/G
0.3W/G
J-53
J-54
B-51
H-5
12
30
1
1
0.3BR/W
0.5BR/W
B-51
6
0.3O/L
0.5W
2B
0.5B
0.3W/V
0.5B/Y
QOS-III CONTROL UNIT (13)
ABS
B-51
7
0.5L/O
0.5B/L
0.5L/O
0.5B/L
0.5Y/B
0.5Y/B
THERMO UNIT
0.5BR/R
0.5Y/R
FUEL TANK UNIT
0.5Y/G
0.5B/Y
0.5B
SIG
+
OIL PRESSURE SW (55, 69, 66)
J-8
B-52
H-5
1
20
1
0.3SB
0.5SB
QOS-II CONTROL UNIT (7)
9
TIMER
B-52
12
B-55
B-55
B-55
B-51
EXHAUST BRAKE SW
B-69 (2)
B-51
8
B-52
5
HEAD LIGHT (LH)
TURN SIGNAL LIGHT SW
B-70 (5)
TURN SIGNAL LIGHT SW
B-70 (13)
RELAY:
RR FOG LIGHT(5)
FUSE NO. 9
RELAY; TAIL (5)
H-7
B-67
B-67
B
ST
ACC
ON
OFF
2
P-1
P-2
P-3
P-4
P-5
2
1
3
FRAME
FL-1
3B/Y
STARTER SW
(24V MODEL)
F-16 10A
METER
H-6
3W/L
MAIN
FL-2
100A or 120A
40A(24V)
50A(12V)
KEY SW
8W
0.5B/Y
F-4 15A
AUDIO(B), DOOR LOCK
0.5LG/R
(24V)
0.5LG/L
11
8
10
1
0.5R/G
0.5G/B
0.5G/W
0.5R/B
B-55
2
0.3W
0.5R
0.85R
5W/B (24V)
8W/B (12V)
B-7
J-9
HEADLIGHT
BRACKET (LH)
FRAME-LH
(CENTER)
B-1
FRAME-LH
(FRONT)
0.5B
VEHICLE SPEED SENSOR
DSW
QOS-III CONTROL UNIT (9)
2B
SENSOR
POWER SOURCE
CIRCUIT
B-52
4
EHCU ; ABS
ABS INDICATOR RELAY
X-5
X-5
X-5
X-5
SHORT CONNECTOR (W/O HBB)
1
5
4
3
10
6
2
0.3W/B
PARKING BRAKE
SW
0.3W/B
3
1
H-12
H-5
N-6
0.3W/L
0.3BR
9
3
78
X-33
X-33
X-33
DIODE
0.3
W/R
0.3W/B
H-5
H-5
0.5BR
0.5W/B
13
98
0.5W/R
23
4
B-18
B-18
VACUUM TANK
SW
1
DIODE
AIR PRESSURE
SW
B-236
B-236
2
1
0.3BR
0.3
BR
0.3BR
0.3
BR/Y
B-71
B-18
N8A0527E
8-278 CAB AND CHASSIS ELECTRICAL
For 4JH1 Engine
B-51
B-52
0.3BR/Y
0.3W/B
0.3BR
B-52
3
0.5W/L
RELAY; CHARGE (5)
B-85
B-85
B-51
14
2
1
0.3W/B
0.5B
0.5B/Y
0.3W/B
0.3W/B
0.3W/B
0.3W/B
PARKING BRAKE
SW
SHORT CONNECTOR (WITH HBB)
RELAY;
BUZZER CANCEL
BRAKE FLUID SWITCH
3B
11
3
5
X-13
X-13
X-13
X-13
0.3W/B
3
1
H-12
N-6
2
4
1
HBB LEVEL
SW
B-52
B-52
B-51
B-55
B-55
B-55
H-6
H-5
J-28
B-55
B-52
B-52
J-28
E-7
H-14
B-51
H-5
H-5
B-55
J-32
J-32
B-55
H-5
B-52
J-28
H-5
B-55
H-5
B-55
J-32
B
ST
ACC
ON
B-67
B-67
8
B-52
H-5
E-14
J-9
B-7
B-1
B-51
70dB
J-53
J-54
H-5
B-51
BUZZER
P-1
P-2
P-5
H-7
2
1
3
2
B-51
61
12
20
1
30
1
1
31
0
15
31
19
25
12
3
7
21
1
10
4
9
8
14
23
6
1
2
3
1
B-52
41
0
8
1
1
FRAME
FL-1 100A
3W/L
STARTER SWITCH
F-16
METER
10A
0.5B/Y
3B/Y
EXHAUST BRAKE SWITCH B-69 (2)
(COMBINATION SWITCH)
HEADLIGHT (LO)
RELAY; RR FOG LIGHT (5)
TURN SIGNAL LIGHT SWITCH (LH) B-70 (5)
(COMBINATION SWITCH)
TURN SIGNAL LIGHT SWITCH (RH) B-70 (13)
(COMBINATION SWITCH)
0.5LG/L
0.5R/G
0.5R/G
0.5G/B
0.5G/W
B-336
31
2
5
0.3W/R
0.5LG/R
5W
8W/B
0.5R
0.5R
FRAME-LH
(FRONT)
HEADLIGHT
BRACKET (LH)
FRAME-LH
(CENTER)
0.85B
3B
2B
0.5B
0.3O/L
ECM (43)
OIL PRESSURE SWITCH
0.3LB
0.3LG/W
0.5LG/W
0.5B
WATER SEDIMENTER SWITCH
0.3B/Y
0.5B/Y
0.3Y/R
0.5Y/R
0.85B
0.5B
0.85B
0.5B
0.3BR/R
0.5BR/R
0.3Y/B
0.5Y/B
0.5Y/B
0.3B
0.5LG
THERMO UNIT
FUEL TANK UNIT
VEHICLE SPEED
SENSOR
0.3Y/G
0.5Y/G
8W
MAIN
2L
FL-2 50A
KEY SW
TACHOMETER
COOLANT
TEMPERATURE GAUGE
FUEL LEVEL
FUEL GAUGE
SPEEDO
METER
ILLUMINATION
(X5)
TURN (RH)
TURN (LH)
HIGH BEAM
EXHAUST
BRAKE
REAR FOG
CHARGE
BRAKE FLUID
LEVEL
WATER
SEDIMENTER
OIL PRESSURE
VACUUM
GLOW
SENSOR
POWER SOURCE
CIRCUIT
ECM (27)
CHECK ENGINE
B-51
4
0.5G/Y
ECM (43)
B-51
2
0.5G/R
ECM (60)
0.5LB
H-14 1.25LB
B-51
7
ABS
X-5
4
X-5
3
1
5
X-5
X-5
ABS INDICATOR
RELAY
0.5W
0.5B/Y
2B
0.5B
0.3W/V
EHCU ; ABS
0.3B
B-337
B-337
4
1
PLUS
CONVERTER
B-337
B-337
6
5
B-338
B-338
4
3
TACHOGRAPH
(IN INST)
B-338
B-338
2
6
B-338
5
B-338
1
B-335
B-334
B-335
1
3
2
TACHOGRAPH
(IN METER)
7
B-335
6
B-335
5
B-335
F-7 10A
TAIL LIGHT
0.5R
0.5LG/R
0.5B
0.3W/B
0.5B
0.5B/Y
0.5B/Y
0.5LG/R
0.5R
BOOSTER
0.85LG/R
F-4 15A
AUDIO(B), DOOR LOCK
TAIL RELAY
0.5B/Y
4
P-3
P-4
FOR EC ONLY
SHORT CONNECTOR (W/O HBB)
1
5
4
3
10
6
2
AIR PRESSURE
SW
B-236
B-236
23
4
2
1
B-18
B-18
VACUUM TANK
SW
1
DIODE
0.3
BR
B-71
0.3BR
0.3
BR
0.5BR
0.5W/B
2
1
4
12
3
98
0.3W/L
0.3BR
9
3
78
X-33
X-33
X-33
DIODE
0.3
W/R
0.5W/R
0.5W/B
0.3
BR/Y
J-128
J-128
J-128
J-128
H-5
H-5
H-5H-5
B-18
N8A0528E
CAB AND CHASSIS ELECTRICAL 8-279
For 4HK1 Engine
B-55
H-5
J-32
H-7
B-67
J-32
B-67
B-55
H-5
B-52
H-5
B-55
J-32
2
B-55
B-55
B-55
B-51
B-1
5
J-28
J-28
H-5
H-14
3
E-76
E-2
E-2
B-55
B-51
H-5
H-5
B-52
B-52
B-55
B-52
P-1
P-2
P-3
P-4
P-5
2
1
B-52
11
8
10
1
10
4
1
2
23
7
3
5
7
14
21
2
1
10
3
1
19
31
25
2
13
FRAME
FL-1 100A or 120A
B
ST
ACC
ON
OFF
STARTER SWITCH
5W
H-6
EXHAUST BRAKE SWITCH B-69 (2)
(COMBINATION SWITCH)
HEADLIGHT (LO)
TURN SIGNAL LIGHT SWITCH (LH) B-70 (5)
(COMBINATION SWITCH)
TURN SIGNAL LIGHT SWITCH (RH) B-70 (13)
(COMBINATION SWITCH)
0.5R
0.5R
F-4 15A
AUDIO(B), DOOR LOCK
J-28
ENGINE SPEED
SENSOR
THERMO UNIT
0.3B/L
0.3LG
0.3Y/B
0.3BR/R
0.3Y/R
0.5B
FUEL TANK UNIT
0.85B
0.85B
VEHICLE SPEED
SENSOR
0.3Y/G
0.3B/Y
0.5B/Y
0.5Y/G
0.5B
FRAME-LH
(FRONT)
3W/L
MAIN
2L
FL-2 40A
KEY SW
TACHOMETER
89
THERMO
METER
FUEL LEVEL
FUEL METER
SPEEDO
METER
ILLUMINATION
(X5)
TURN
(RH)
TURN
(LH)
HIGH
BEAM
EXHAUST
BRAKE
0.5G/W
12
0.5G/B
0.5R/G
0.5LG/R
SENSOR
POWER SOURCE
CIRCUIT
3
F-16 10A
METER
B-52
4
RR FOG RELAY X-23 (5)
RR FOG
0.5R/G
H-8
H-8
16
15
H-8
13
H-14
H-14
12
13
H-14
13
0.3V
0.3LG
0.3LG
0.3V
0.3LG
0.3V
( )
( )
F-7 10A
TAILLIGHT
TAIL RELAY
5W/B
0.5LG/R
BUZZER
B-51
90dB
B-51
6
7
ECM (3)
0.3O/L
2B
GLOW
ABS
J-8
B-52
H-5
B-51
8
1
20
1
OIL PRESSURE SWITCH
0.3LB
0.5B/Y
0.5LB
OIL PRESSURE
CHARGE
BOOSTER
VACUUM
BRAKE FLUID
LEVEL
ABS INDICATOR RELAY
0.5W
0.5B/Y
0.5B
EHCU ; ABS
0.3W/V
4
1
3
5
X-5
X-5
X-5
X-5
J-9
B-7
3B
HEADLIGHT
BRACKET (LH)
FRAME-LH
(CENTER)
0.5B
B-51
B-52
0.3BR/Y
0.3BR
B-52
3
0.5W/L
RELAY; CHARGE (5)
B-85
B-85
B-51
14
2
1
0.3W/B
0.5B
0.5BR
0.5W/B
0.5B/Y
0.3W/B
0.3
W/B
0.3
W/R
0.5W/R
0.5W/B
0.3W/B
0.3W/B
0.3W/B
0.3B
PARKING BRAKE
SW
AIR PRESSURE
SW
SHORT CONNECTOR (WITH HBB)
RELAY;
BUZZER CANCEL
BRAKE FLUID SWITCH
3B
11
3
5
X-13
B-236
X-13
X-13
X-13
B-236
0.3W/B
3
1
H-12
9
78
X-33
N-6
2
4
1
23
4
2
1
SHORT CONNECTOR (W/O HBB)
HBB LEVEL
SW
B-18
B-18
X-33
X-33
2
1
12
4
3
98
VACUUM TANK
SW
1
DIODE
DIODE
0.3BR
0.3BR
0.3BR
1
5
4
3
10
6
2
0.3
BR
0.3
BR
B-71
H-5
H-5
J-128
J-128
J-128
J-128
0.3
BR
H-5H-5
B-18
N8A0529E
8-280 CAB AND CHASSIS ELECTRICAL
Connector List
Except 4JH1 / 4HK1 Engine
No.
Connector Face
B-1
B-7
B-18
B-52
B-51
B-55
N-6
N-6
000-001
000-001
004-004
1
2
3
4
012-005
1
2
3
4
5
6
7
8
9 10 11 12
014-001
1 2 3 4 5 6 7 8
9 1011121314
012-004
1
2
3
4
5
6
7
8
9 10 11 12
001-002
1
001-011
1
B-67
B-67
B-71
B-71
J-8
J-8
B-85
B-85
No.
Connector Face
004-001
1
2
3
4
004-002
2
4
1
3
001-013
1
001-014
1
001-013
1
001-014
1
002-009
1
2
002-010
1
2
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