HO
HO
HO
HO HORN
HORN
HORN
HORN
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Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
1. Horn always on.
Step Operation
Yes
No
1 I s the vehicle equipped with any anti-theft system? Go to Step 2. Go to Step 3.
2 I s the vehicle diagnostic system check performed? Go to Step 4.
C heck vehicle
diagnostic system.
3 I s horn operation and other necessary inspection performed? Go to Step 4. Check horn harness.
4
P ress and then release the horn botton.
Is the horn always on?
Go to Step 5. Check horn harness.
5 Is the vehicle equipped with any anti-theft system? Go to Step 6. Go to Step 7.
6
Disconnect the body control module.
Is the horn always on?
Go to Step 7. Go to Step 11.
7
Disconnect the horn relay.
Is the horn always on?
Go to Step 10. Go to Step 9.
8 C heck horn relay for poor contact. I s any fault detected and elimilated? Go to Step 15. Go to Step 14.
9
R epair the horn relay control circuit that is shorted to ground.
I s the maintenance finished?
Go to Step 15. —
10
C heck harness connector of body control module for poor contact.
Is any fault detected and elimilated?
Go to Step 15. Go to Step 13.
12
Repair the shorted horn control circuit.
Is the maintenance finished?
Go to Step 15. —
13
R eplace the body control module.
Is the replacement finished?
Go to Step 15. —
14
Replace the horn relay.
Is the replacement finished?
Go to Step 15. —
15 Is the horn able to operate normally? System is normal. Go to Step 1 .
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