Isuzu N-Series. Service manual — part 1157
8-340 CAB AND CHASSIS ELECTRICAL
Installation
To install, follow the removal steps in the reverse order.
SRS Control System
General Description
SRS airbag supplements the driver’s seat belt protec-
tion by deploying airbag at the top center of the steering
column.
SRS airbag deploys in case of front collision over certain
degree of impact.
This system consists of SRS control unit, driver’s SRS
airbag, SRS coil assembly, exclusive wire harness, and
“SRS” warning lamp in the meter and forms a deploy-
ment circuit.
A sensor is equipped to this circuit to convert the impact
into an electrical signal in case of front collision over cer-
tain degree of impact. The electrical signal generated at
this time will be processed in the SRS control unit to
compare with the value stored in the memory.
When the generated signal exceeds the setting value,
SRS control unit sends sufficient current to SRS airbag
for deployment.
Parts Location
N8A0364E
A-1 AIR BAG
BATTERY
FL-2 FUSIBLE LINK
B-1 EARTH; FRAME LH (FRONT)
FUSE BOX ASM
F-16, F-18
B-79 DATA LINK CONNECTOR
B-51 SRS WARNING LIGHT
(METER)
B-244 SRS COIL
B-67
B-276 SRS COUPLING
CONNECTOR
B-243 SRS CONTROL UNIT
H-7
B-275 EARTH; FRAME RH (FRONT)
N9A0066E
CAB AND CHASSIS ELECTRICAL 8-341
Circuit Diagram
0.85
B
1.25 B
0.5
SB
0.5
B
0.5
B
0.5
B/R
0.5
B/Y
0.5
W/R
0.5
W/R
0.85
B
0.5
B/R
0.5
B/R
0.5
B/R
0.5
GY
0.5
B
0.5
B
0.5
SB
0.5
GY
FRAME
P-5
P-1
P-2
P-3
P-4
FL-2
KEY SW
STARTER SWITCH
METER
AIR BAG
SRS COUPLING
CONNECTOR
SHORTING
CONNECTOR
SHORTING
CONNECTOR
SRS COIL
AIR BAG
SRS CONTROL UNIT
SRS COUPLING
CONNECTOR
DATA LINK CONNECTOR
B-1
B-1
B-275
FRAME LH (FRONT)
FRAME LH (FRONT)
FRAME RH (FRONT)
3.0
W/L
3.0 W/L
3.0 B/Y
8.0B
2L
40A
H-7
1
B-67
B-67
2
3
OFF
ACC
ON
ST
F-16 10A
METER
F-18 10A
SRS
B-51
18
B-276
4
B-276
1
B-276
B-243
B-243
2
15
B-243
B-276
B-276
B-276
19
B-79
5
B-79
4
4
B-243
16
6
7
B-79
B-79
7
13
8
B-243
6
B-243
5
14
B-51
1
B-244
2
B-244
B-243
18
B-243
20
B-243
8
B-243
A-1
A-1
7
0.5
Y
0.5
Y/B
N9A0085E
8-342 CAB AND CHASSIS ELECTRICAL
Connector List
No.
Connector Face
A-1
A-1
B-1
B-51
B-67
B-67
B-79
B-243
002-045
002-046
000-001
020-004
004-002
2
4
1
3
004-001
1
2
3
4
016-005
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
9
021-001
No.
Connector Face
B-244
B-244
B-275
B-276
B-276
P-1
P-2
P-3
002-043
002-044
000-020
008-009
1 2
3
8
4 5 6 7
008-010
1
2
3
8
4
5
6
7
000-004
000-006
000-006
CAB AND CHASSIS ELECTRICAL 8-343
H-7
Heater and Air Conditioning
General Description
The air conditioning consists of compressor, evaporator,
condenser, A/C switch, fan switch, etc. When the engine
is rotating, the A/C starts to work with both the A/C and
fan switches “ON”, followed by the engagement of the
magnetic clutch. It stops to work when either the fan
switch or the A/C switch turns “OFF”. In addition to the
switches, the A/C has the function of temporary stop of
its operation by the sensing system in the A/C cycle,
such as:
• sensing abnormal rise of the refrigerant pressure
by means of the pressure switch.
• sensing temperature of the blowing-off air by
means of the thermo switch preventing the evapo-
rator from freezing.
• sensing the coolant temperature by the thermo
switch (available for limited models only).
When fan control knob (fan switch) is put on with temp.
Control lever being in the “FULL HOT” position (FULL
HOT switch on) ceramic heater within heater unit gener-
ates heat, raising a heater blow-off temperature to en-
hance heating performance.
No.
Connector Face
P-4
P-5
000-004
000-002
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
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