Isuzu N-Series. Manual — part 1042
CAB AND CHASSIS ELECTRICAL 8-273
In checking, measure the following three points with the
circuit tester in the range of “resistance x 1 (
Ω).”
Between A and B
No continuity (No reading at the indicator)
→
Normal
Continuity (A bite in the feeder. The core grounded)
→
Lower reception
Between B and C
Continuity (Indicator reading: 0
Ω) → Normal
No continuity (Shielded core disconnected or defective
grounding at the screw
→ Hampered by noise)
Between A and D
Continuity or no continuity
There are some antenna feeders and relay feeders with
a condenser built in their connections.
Measuring resistance between the two points does not
result in correct judgment. Connect temporarily another
normal antenna to the radio and check to see if its re-
ception is audible. Most antenna now available are slide
type. Rust at the screw C and the cab panel where
grounded would lead no continuity, followed by lower re-
ception.
Keep this portion clean to avoid rust.
Removal
Preparation:
Disconnect the battery ground cable.
1. Antenna
1) Disconnect the joint connector.
2) Remove the upper and lower side antenna
bracket.
3) Pull out the antenna feeder.
Notice:
For easier fitting, tie the lead wire to the end of the an-
tenna feeder in advance.
Installation
To install, follow the removal steps in the reverse order.
Speaker
Inspection
1. With the circuit tester set to the range of
× 1 (Ω),
connect the circuit tester probes (red and black) to
the (+) and (
−) terminals of the speaker.
2. When the speaker is normal, a low buzzing sound
is heard.
3. When the speaker is defective, no sound is heard.
However, the distortion or chattering of the sound
cannot be identified.
When the speaker is installed to the vehicle, dis-
connect the connectors before checking.
N8A0289E
Legend
1. Antenna
2. Antenna Bracket
3. Feeder
4. Joint Connection
5. Feeder
6. Clip
7. Radio
1
2
3
4
5
6
7
N8A0394E
8-274 CAB AND CHASSIS ELECTRICAL
When no sound is heard, the following are consid-
ered as the cause.
• The speaker wiring is disconnected at the speaker
terminals.
• The speaker body is defective.
• There is an open circuit somewhere in the speaker
harness on the vehicle side.
• The speaker harness on the vehicle side is ground-
ed or caught up.
Removal
Preparation:
Disconnect the battery ground cable.
1. Door Pad
Refer to “FRONT DOOR TRIM PAD” of section 2.
2. Speaker Panel
Disconnect the speaker connector.
3. Speaker
4. Waterproof Sheet
Installation
To install, follow the removal steps in the reverse order.
Cigar Lighter
Removal
Preparation:
Disconnect the battery ground cable.
1. Center Cluster
Refer to “RADIO” in this section.
2. Cigar Lighter Assembly
Remove the nut, then remove cigar lighter assem-
bly, bezel and outer case.
Installation
To install, follow the removal steps in the reverse order.
Meter and Warning/indicator Light
General Description
The circuit consists of the starter switch, meter assem-
bly, vacuum tank switch, seat belt switch, oil pressure
switch, fuel sedimenter switch, brake fluid switch, park-
ing brake switch, vehicle speed sensor, fuel tank unit,
thermo unit and engine speed sensor.
The meter assembly contains the speedometer, ta-
chometer, fuel meter, thermometer and the warning/in-
dicator light.
The meter warning/indicator lights and their bulb sock-
ets are a unit, they are installed from the back of the
speedometer assembly.
Legend
1. Trim Panel
2. Speaker Panel
3. Speaker
4. Waterproof Sheet
N8A5341E
Legend
1. Bezel
2. Cigar Lighter Assembly
3. Center Cluster
4. Outer Case
5. Nut
2
1
4
5
3
N8A0395E
CAB AND CHASSIS ELECTRICAL 8-275
Parts Location
For 12 Volt
A
FRAME
HARNESS
E-14
OIL PRESSURE
SWITCH
E-7
THERMO UNIT
H-14
H-14
E-2
TACHO
SENSOR
H-14
E-7
THERMO UNIT
<4JB1>
<4JH1>
<4JH1>
FUSE BOX ASM
F-4,F-7,F-16
B-55 METER
B-334, B-335
TACHOGRAPH
(IN METER)
B-338
TACHOGRAPH
(IN INST)
H-5~H-7
B-1
B-67
B-337
PLUS CONVERTER
B-7
H-12
J-9
B-71 VACUUM
TANK SW
B-85 BRAKE
OIL LEVEL SW
STARTER
J-8 OIL
PRESSURE SW
(Except 4JH1)
J-128
HBB LEVEL SW
FL-1,FL-2 FUSIBLE LINK
RELAY BOX
ASM
P-1
P-2
P-5
BATTERY
J-32 VEHICLE
SPEED SENSOR
J-28
FUEL TANK UNIT
N-6
PARKING BRAKE SW
J-53,J-54
FUEL SEDIMENTER
STATER SW
B-52 METER
B-51 METER
B-336 METER
(4JH1)
A
N-5
P-5
P-1
(12V)
P-2
P-4
P-3
<4JH1>
B-236
AIR PRESSURE
SWITCH
X-5 ABS
INDICATOR RELAY
B-18 DIODE
X-33 DIODE
X-13 BUZZER
CANCEL RELAY
N8A0534E
8-276 CAB AND CHASSIS ELECTRICAL
For 24 Volt
<4HE1, 4HF1, 4HG1, 4HK1>
J-28
FUEL TANK UNIT
N-6
PARKING BRAKE SW
J-32 VEHICLE SPEED SENSOR
E-2
TACHO SENSOR
H-14
P-5
P-1
P-2
P-3
P-4
RELAY BOX ASM
FL-1, FL-2
FUSIBLE LINK
J-9
H-12
B-67
B-7
B-1
H-5, H -7, H-8
STARTER
J-8
OIL PRESSURE SW
B-71
VACUUM TANK SW
B-85
BRAKE FLUID LEVEL SW
BATTERY
H-14
STARTER SW
B-52
METER
B-51
METER
B-55
METER
FUSE BOX ASM
F-4, F-7, F-16
E-76 THERMO
SENSOR(UNIT)
J-128
HBB LEVEL SW
X-13 BUZZER
CANCEL RELAY
B-18
DIODE
B-236
AIR PRESSURE
SWITCH
X-33
DIODE
X-5 ABS
INDICATOR RELAY
J-53, J-54
FUEL SEDIMENTER
N-5
SEAT BELT SW
N8A0535E
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