Isuzu N-Series. Service manual — part 1125
8-212 CAB AND CHASSIS ELECTRICAL
1. Horn
1-1. Horn Does Not Sound
N8A5222E
CAB AND CHASSIS ELECTRICAL 8-213
1-2. Horn Does Not Shut Off
2. Backup Light
2-1. Backup Lights Inoperative
N8A5224E
• IS FUSE F-16 (10A) NORMAL?
• IS J-9 SECURELY GROUNDED?
YES
NO
REPLACE THE FUSE
• TURN THE STARTER SW ON
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
BACKUP LIGHT SWITCH HARNESS SIDE CONNECTOR
1 E-10 (OR 1 J-49 )AND THE GROUND?
YES
NO
GROUND IT SECURELY
• ENTER THE TRANSMISSION SHIFT LEVER TO
REVERSE POSITION
• WHEN REMOVE THE CONNECTOR OF THE BACKUP
LIGHT SWITCH, IS THERE ANY CONTINUITY
BETWEEN THE SW SIDE CONNECTORS 1 E-10 AND
2 E-10 (OR 1 J-49 AND 2 J-49 )?
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE F-16 (10A) AND 1 E-10 OR 1 J-49
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE BACKUP LIGHT
SWITCH HARNESS SIDE CONNECTORS 2 E-10
(OR 2 J-49 )AND 4 H-16
YES
NO
REPAIR OR REPLACE THE BACKUP LIGHT
SWITCH OR INHIBITOR SW
N8A0189E
8-214 CAB AND CHASSIS ELECTRICAL
2-2. Backup Light on the Left (or Right) Side Inoperative
2-3. Backup Light Remains on
Starter Switch
Refer to “START AND CHARGING” in this section.
Horn
Inspection
Check to see if horn sound when a battery voltage be-
tween horn terminal and the fixing bracket. Repair or re-
place the horn when the result of inspection is found
abnormal.
N8A5226E
REPAIR OR REPLACE THE BACKUP LIGHT SW OR INHIBITOR SW
N8A0191E
N8A0192E
CAB AND CHASSIS ELECTRICAL 8-215
Removal
Preparation:
Disconnect the battery ground cable.
1. Bumper
Refer to “BUMPER” in section 2.
2. Horn
Disconnect the connector (3).
Installation
To install, follow the removal steps in the reverse order.
Horn Switch
Inspection
With the contact point of the horn switch pressed to the
switch bracket, check the continuity between the con-
nector terminal and the bracket of the switch.
Check the contact condition between horn contact of the
combination switch and contact plate of steering wheel.
Repair or replace the switch when the result of inspec-
tion is found abnormal.
Removal
Preparation:
Disconnect the battery ground cable.
1. Horn Pad
1) Hold the horn pad and pull it upward.
2. Steering Wheel
1) Remove the steering shaft nut.
2) Remove the steering wheel by using steering
wheel remover.
(Refer to Section 3B4 “STEERING COLUMN”
for steering wheel removal steps.)
3. Horn Switch
Installation
To install, follow the removal steps in the reverse order,
noting the following point.
1. Tighten the steering shaft nut to the specified
torque.
Tighten:
Shaft nut to 49 N
⋅m (5 kg⋅m / 36 lb⋅ft)
1
2
3
N8A5485E
N8A0194E
N8A5231E
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