Isuzu N-Series. Service manual — part 1056
CAB AND CHASSIS ELECTRICAL 8-329
Installation
To install, follow the removal steps in the reverse order,
noting the following points.
1. Bleed the air from brake and clutch fluid pipe line.
2. Check to see if the brake fluid level in the tank with-
in specified level.
3. Check to see if brake warning light comes on when
starter switch is turned on and then warning light
goes off after the engine running.
Parking Brake Indicator Light
The parking brake indicator light is connected in series
with the parking brake switch installed to the parking
brake lever bracket.
The light comes on when the parking brake lever is
pulled, and goes out when the parking brake lever is ful-
ly released.
Notice:
The parking brake indicator light illuminates to warn the
driver that the parking brake is on. This light does not in-
dicate the condition of the operability of the parking
brake.
Circuit Inspection
1. Disconnect the parking brake switch connector.
2. Connect the harness side connector terminal to the
ground.
3. Check to see if the indicator light comes on with the
starter switch “ON”.
Check the bulb or the harness when the result of
inspection is found abnormal.
Parking Brake Switch
Inspection
1. Disconnect the parking brake switch connector.
2. Check to see if there is any continuity between the
switch terminal and the body ground with the circuit
tester connected between them.
Repair the parking brake switch or replace it when the
result of inspection is found abnormal.
Removal
Preparation:
Disconnect the battery ground cable.
1. Parking Brake Switch
1) Disconnect the connector.
2) Remove the fixing screw.
N8A0361E
When parking brake applied
Continuity
When parking brake released
No continuity
N8A0362E
N8A0363E
8-330 CAB AND CHASSIS ELECTRICAL
Installation
To install, follow the removal steps in the reverse order.
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).
N8A0364E
CAB AND CHASSIS ELECTRICAL 8-331
Parts Location
For 12 Volt
X-10
X-12
<4JB1, 4JH1, 4JG2>
FL-1, FL-25 FUSIBLE LINK
X-24
A/C
COMPRESSOR
RELAY
X-26
A/C
SIGNAL
RELAY
<4HG1>
(55)
H-5, H-6,
H-8
B-339 A/C ON
SIGNAL RESISTOR
RELAY BOX ASM (No.2)
B-234 ECM
N8A0532E
8-332 CAB AND CHASSIS ELECTRICAL
For 24 Volt
X-10
X-12
<4HF1 / 4HG1 / 4HE1 / 4HK1>
J-191 ECM
H-14, H-105 (4HK1)
FUSE BOX ASM
F-1
F-26 FUSE
FL-1 FUSIBLE LINK
J-23 DIODE
X-27 CONDENSER FAN
RELAY
N8A0533E
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