Isuzu N-Series. Service manual — part 1021
CAB AND CHASSIS ELECTRICAL 8-189
Diagnosis
Quick Chart for Check Point
1. Turn Signal Light, Hazard Warning Light
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
2. Stoplight
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
Check point
Fuse
Turn
signal
light SW
Hazard
warning
light SW
Flasher
unit
Turn
signal
light bulb
Cable
harness
F-19, F-20
(15 A)
F-11
(10 A)
Trouble
mode
1-1. Turn signal lights
inoperative
❍
❍
❍
❍
1-2. Turn signal lights
flash too quickly
❍
❍
1-3. Hazard warning
lights inoperative
❍
❍
Check point
Fuse
F-5 (10 A)
Stoplight SW
Stoplight bulb
Cable harness
Trouble
mode
2-1. Both stoplights inoperative
❍
❍
❍
2-2. Stoplight on the left (or right)
side inoperative
❍
❍
8-190 CAB AND CHASSIS ELECTRICAL
1. Turn Signal Light, Hazard Warning Light
1-1. Turn Signal Lights Inoperative
N8A0169E
CAB AND CHASSIS ELECTRICAL 8-191
1-2. Turn Signal Lights Flash Too Quickly
• IS THERE ANY CONTINUITY BETWEEN THE HARNESS
SIDE CONNECTORS 3 B-16 AND B-7 ?
GROUND IT SECURELY
CONTINUED FROM THE PREVIOUS PAGE
CONTINUED FROM THE PREVIOUS PAGE
• DISCONNECT THE COMBINATION SWITCH
CONNECTOR
• IS THERE ANY CONTINUITY BETWEEN THE SWITCH
CONNECTORS 5 B-70 AND 12 B-70 (WHEN
TURNING LEFT), 13 B-70 AND 12 B-70 (WHEN
TURNING RIGHT) RESPECTIVELY?
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE CIRCUIT
• REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE HARNESS SIDE
CONNECTORS 2 B-16 (12V), 5 B-16 (24V) AND
12 B-70
YES
NO
REPAIR OR REPLACE THE SWITCH
N8A0170E
• DOES ANY TURN SIGNAL LIGHT REMAIN
UNLIGHTED?
YES
DISCONNECT AND REINSTALL THE BULB, OR
REPLACE IT, OR REPAIR AN OPEN CIRCUIT IN
THE CIRCUIT OF THE INOPERATIVE BULB, OR
CHECK THE GROUND
N8A0171E
8-192 CAB AND CHASSIS ELECTRICAL
1-3. Hazard Warning Lights Inoperative
2. Stoplight
2-1. Both Stoplights Inoperative
• IS FUSE F-19 , F-20 (15A) NORMAL?
• DOES THE HAZARD WARNING LIGHT SWITCH
FUNCTION NORMALLY?
YES
NO
REPLACE THE FUSE
• REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN FUSE F-19 , F-20 (15A)
AND 1 B-30
YES
NO
REPLACE THE HAZARD WARNING LIGHT
SWITCH
N8A0172E
• IS FUSE F-5 (10A) NORMAL?
• IS J-9 GROUNDED SECURELY?
YES
NO
REPLACE THE FUSE
• IS BATTERY VOLTAGE APPLIED TO THE 1 B-66 OF
THE STOPLIGHT SW?
YES
NO
GROUND IT SECURELY
• IS STOPLIGHT SWITCH NORMAL?
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE FUSE F-5 (10A) AND 1 B-66
YES
NO
• DOES THE PUSH ROD OF THE STOPLIGHT SW
OPERATE SMOOTHLY?
REPLACE THE STOPLIGHT SW
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 2 B-66 AND J-9
YES
NO
REPLACE THE STOPLIGHT SW
N8A0173E
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