Sakai SW300-1, Shop Manual

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10-052
TROUBLESHOOTING
2-6-15 Horn does not sound
Reference Fig. : 2-6-5
Check point Check/Cause Action
1. Horn • Disconnect horn and directly connect battery positive
terminal to horn terminal wire Lg side and negative
terminal to horn terminal wire B side.
• If horn does not sound, horn is faulty.
Replace horn.
2. Horn Relay (1) When starter switch is ON and horn switch is pressed,
measure voltage between horn relay terminal 2 outlet
wire LgW and chassis ground.
Standard voltage : 12 V or more
(2) When starter switch is ON and horn switch is pressed,
measure voltage between horn relay terminal 5 outlet
wire Lg and chassis ground.
Standard voltage : 12 V or more
• If above item (1) is OK and item (2) is NG, horn relay is
faulty.
Replace horn relay.
3. Horn Switch • When horn switch is not pressed, measure resistance
between horn switch terminals.
Standard resistance : 100 k Ω or more
• If resistance is abnormal, horn switch is faulty.
Replace horn switch.
4. Harness Connecting
Between Terminals
• Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
• If resistance is abnormal, harness is faulty.
Repair or replace
harness.
2-6-16. Backup buzzer does not sound
Reference Fig. : 2-6-5
Check point Check/Cause Action
1. Backup Buzzer • Disconnect backup buzzer and directly connect battery
positive terminal to backup buzzer terminal wire BY side
and negative terminal to backup buzzer terminal wire B
side.
• If backup buzzer does not sound, backup buzzer is faulty.
Replace backup buzzer.
2. Backup Buzzer Switch (1) When starter switch is ON, measure voltage between
backup buzzer switch terminal COM inlet wire RG and
chassis ground.
Standard voltage : 12 V or more
(2) When starter switch is ON and F-R lever is in “R”,
measure voltage between backup buzzer switch
terminal NO outlet wire BY and chassis ground.
Standard voltage : 12 V or more
• If above item (1) is OK and item (2) is NG, backup buzzer
switch is faulty.
Replace backup buzzer
switch.
3. Harness Connecting
Between Terminals
• Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
• If resistance is abnormal, harness is faulty.
Repair or replace
harness.
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