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