Isuzu N-Series. Service manual — part 1142
8-280 CAB AND CHASSIS ELECTRICAL
H-6, H-7
P-1
(12V)
P-2
P-1
(24V)
P-4
P-2
(24V)
P-3
P-5
(12V)
P-5
(24V)
No.
Connector Face
000-003
000-004
000-004
000-004
000-006
000-006
000-007
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
CAB AND CHASSIS ELECTRICAL 8-281
Diagnosis
Cigar Lighter Does Not Heat Sufficiently
The Cigar Lighter Does Not Spring Out After Being Heated
• IS FUSE F-15 (15A) NORMAL?
NO
• REMOVE THE CIGAR LIGHTER
• SET THE STARTER SWITCH TO EITHER "ACC" OR "ON"
POSITION
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
BIMETAL AT THE CENTER OF THE CASE AND OUTER
OF THE CASE?
REPLACE THE FUSE
YES
• IS B-7 GROUNDED SECURELY?
YES
NO
GROUND IT SECURELY
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE F-15 (15A) AND 1 B-44
• SET THE STARTER SWITCH TO EITHER "ACC" OR "ON"
• IS THE BATTERY VOLTAGE APPLIED BETWEEN B-7
AND GROUND?
REPLACE THE CIGAR LIGHTER ASSEMBLY
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 1
B-45 AND B-7
NO
N8A0285E
• IS THE FORM OF CIGAR LIGHTER NORMAL?
NO
REPLACE THE CIGAR LIGHTER ASSEMBLY
(INCLUDE OUTER CASE)
REPLACE THE CIGAR LIGHTER
YES
N8A0286E
8-282 CAB AND CHASSIS ELECTRICAL
Starter Switch
Refer to “START AND CHARGING” in this section.
Radio
Removal
Preparation:
Disconnect the battery ground cable.
1. Center Cluster
1) Pull it to remove. Pry off three clips by the tip of
screwdriver.
2) Remove the cigar lighter power source and its
illumination connector.
Notice:
To remove the center cluster, do not force to pry off
three clips at upper portion of the center cluster.
2. Radio
1) Remove the two radio fixing screws.
2) Disconnect the connector and feeder plug.
Installation
To install, follow the removal steps in the reverse order.
Antenna
Inspection
The metal A is connected to the pole D at the top of the
antenna through the core of the feeder.
The metal B is fitted in the feeder shielding the core, and
grounded at the screw C to avoid the core hampered by
noise.
Defective grounding would cause noise.
Legend
1. Center Cluster
N8A5337E
Legend
1. Radio
N8A5338E
N8A0289E
CAB AND CHASSIS ELECTRICAL 8-283
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.
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.
Legend
1. Antenna
N8A5340E
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