Symptoms - beep
Description of the test
The numbers below indicate the item numbers in the diagnostic table.
5. Check that the body controller (BCM) connected the horn relay to ground.
6. Check for voltage at the battery positive voltage terminal at the horn relay coil.
8. Check for voltage at the battery positive voltage terminal at the horn relay switch. The HORN fuse supplies power to the battery positive terminal on the horn relay switch.
16. For the normal functioning of the sound signal, the maximum current strength is required. Increased resistance (more than 0.5 ohm) in the horn control circuit or the horn ground circuit may cause the horn to malfunction. Inspect circuits for defects that may limit current.
18. The horn relay control circuit includes a horn slip ring and a horn switch. When testing the relay control circuit, check the slip ring and horn switch for high resistance, an open, or a short to voltage.
Symptoms - beep
Step | Operation | Values | Yes | No |
1 |
Check fuse F17.
Has the vehicle system diagnostic check been completed?
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-
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Go to Step 2
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Check the vehicle with a diagnostic tool.
|
2 |
Is the vehicle equipped with a remote keyless entry system?
Is the repair finished?
|
-
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Go to Step 3
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Go to Step 4
|
3 |
Is the voltage equal to the specified value?
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-
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Go to Step 4
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Go to Step 5
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4 |
Press the horn switch.
Does the buzzer work?
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-
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Go to Step 6
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|
5 |
Test part of the horn relay control circuit at the body controller (BCM) for increased resistance or breakage.
Has the cause been found and fixed?
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-
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Go to Step 25
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Go to Step 14
|
6 |
Does the control lamp light up?
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-
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Go to Step 7
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Go to Step 17
|
7 |
Does the control lamp light up?
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-
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Go to Step 8
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Go to Step 18
|
8 |
Connect a test lamp between the battery positive voltage circuit at the horn relay switch and a good ground.
Does the control lamp light up?
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-
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Go to Step 9
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Go to Step 19
|
9 |
Briefly connect a jumper wire with a 15 amp fuse between the battery positive voltage circuit at the horn relay switch and the horn control circuit.
Does the buzzer work?
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-
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Go to Step 15
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Go to Step 10
|
10 |
Does the control lamp light up?
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-
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Go to Step 11
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Go to Step 20
|
11 |
Does the control lamp light up?
|
-
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Go to Step 12
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Go to Step 21
|
12 |
Inspect the horn for contact problems.
Has the cause been found and fixed?
|
-
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Go to Step 25
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Go to Step 13
|
13 |
Does the buzzer work?
|
-
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Go to Step 16
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Go to Step 24
|
14 |
Inspect the harness connector at the BCM for loose connections.
Has the cause been found and fixed?
|
-
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Go to Step 25
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Go to Step 22
|
15 |
Inspect the horn relay for poor contact.
Has the cause been found and fixed?
|
-
|
Go to Step 25
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Go to Step 23
|
16 |
Repair the high resistance in the horn control circuit or horn ground circuit. Even a resistance as low as 0.5 ohms can cause a malfunction in the audio signal.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
17 |
Repair the open or high resistance in the battery positive voltage circuit at the horn relay coil.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
18 |
Important: The horn switch is part of the steering wheel airbag module. Refer to Section 8B, Airbag System (SIR).
Repair the open or short to voltage in the horn relay control circuit. The horn relay control circuit includes a horn slip ring and a horn switch.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
19 |
Repair the open or high resistance in the battery positive voltage circuit at the horn relay switch.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
20 |
Repair the open or high resistance in the horn control circuit.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
21 |
Repair the open or high resistance in the horn ground circuit.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
22 |
Important: Perform the BCM programming procedure when replacing the BCM. Replace BCM.
Is the repair finished?
|
-
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Go to Step 25
|
-
|
23 |
Replace horn relay.
Has the replacement been completed?
|
-
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Go to Step 25
|
-
|
24 |
Replace horn.
Has the replacement been completed?
|
-
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Go to Step 25
|
-
|
25 |
Give a sound signal.
Is the buzzer working properly?
|
-
|
System OK
|
Go to Step 25
|
Beep always on
Description of the test
The numbers below indicate the item numbers in the diagnostic table.
5. Check if ground is constantly applied to the horn relay.
6. The horn relay control circuit includes a horn slip ring and a horn switch. When testing the relay control circuit, check for a short to ground on the slip ring and horn switch.
Beep always on
Step | Operation | Values | Yes | No |
1 |
Has the vehicle system diagnostic check been completed?
|
-
|
Go to Step 2
|
Check the vehicle with a diagnostic tool.
|
2 |
Is the vehicle equipped with a remote keyless entry system?
|
-
|
Go to Step 3
|
Go to Step 4
|
3 |
Does the buzzer sound continuously?
|
-
|
Go to Step 4
|
|
4 |
Does the buzzer work?
|
-
|
Go to Step 9
|
Go to Step 5
|
5 |
Connect a test lamp between the battery positive voltage circuit of the horn relay coil and the horn relay control circuit.
Does the control lamp light up?
|
-
|
Go to Step 6
|
Go to Step 7
|
6 |
Important: The horn switch is part of the steering wheel airbag module. See Section 8B, Airbag System (SIR).
Test the horn relay control circuit for a short to ground.
Has the cause been found and fixed?
|
-
|
Go to Step 12
|
Go to Step 8
|
7 |
Inspect the horn relay for poor contact.
Has the cause been found and fixed?
|
-
|
Go to Step 12
|
Go to Step 10
|
8 |
Inspect Body Controller (BCM) for contact violations.
Has the cause been found and fixed?
|
-
|
Go to Step 12
|
Go to Step 11
|
9 |
Repair the short to voltage in the horn control circuit.
Is the repair finished?
|
-
|
Go to Step 12
|
-
|
10 |
Replace horn relay.
Has the replacement been completed?
|
-
|
Go to Step 12
|
-
|
11 |
Important: Perform the BCM programming procedure when replacing the BCM. Replace BCM. See Section 9V, "body controller".
Does the control lamp light up?
|
-
|
Go to Step 12
|
-
|
12 |
Give a sound signal.
Is the buzzer working properly?
|
-
|
System OK
|
Go to Step 1
|
Sound signal does not work
Description of the test
The numbers below indicate the item numbers in the diagnostic table.
5. Check that the body controller (BCM) connected the horn relay to ground.
6. Check for voltage at the battery positive voltage terminal at the horn relay coil.
8. Check for voltage at the battery positive voltage terminal at the horn relay switch. The HORN fuse supplies power to the battery positive terminal on the horn relay switch.
16. For the normal functioning of the sound signal, the maximum current strength is required. Increased resistance (more than 0.5 ohm) in the horn control circuit or the horn ground circuit may cause the horn to malfunction. Inspect circuits for defects that may limit current.
18. The horn relay control circuit includes a horn slip ring and a horn switch. When testing the relay control circuit, check the slip ring and horn switch for high resistance, an open, or a short to voltage.
Sound signal does not work
Step | Operation | Values | Yes | No |
1 |
Check the vehicle with a diagnostic tool.
|
-
|
Go to Step 2
|
Check the vehicle with a diagnostic tool.
|
2 |
Is the vehicle equipped with a remote keyless entry system?
|
-
|
Go to Step 3
|
Go to Step 4
|
3 |
Does the buzzer work?
|
-
|
Go to Step 4
|
Go to Step 5
|
4 |
Press the horn switch.
Does the buzzer work?
|
-
|
Intermittent fault check
|
Go to Step 6
|
5 |
Test part of the horn relay control circuit at the body controller (BCM) for increased resistance or breakage.
Has the cause been found and fixed?
|
-
|
Go to Step 25
|
Go to Step 14
|
6 |
Does the control lamp light up?
|
-
|
Go to Step 7
|
Go to Step 17
|
7 |
Does the control lamp light up?
|
-
|
Go to Step 8
|
Go to Step 18
|
8 |
Connect a test lamp between the battery positive voltage circuit at the horn relay switch and a good ground.
Does the control lamp light up?
|
-
|
Go to Step 9
|
Go to Step 19
|
9 |
Briefly connect a jumper wire with a 15 amp fuse between the battery positive voltage circuit at the horn relay switch and the horn control circuit.
Does the buzzer work?
|
-
|
Go to Step 15
|
Go to Step 10
|
10 |
Does the control lamp light up?
|
-
|
Go to Step 11
|
Go to Step 20
|
11 |
Does the control lamp light up?
|
-
|
Go to Step 12
|
Go to Step 21
|
12 |
Inspect the horn for contact problems.
Has the cause been found and fixed?
|
-
|
Go to Step 25
|
Go to Step 13
|
13 |
Does the buzzer work?
|
-
|
Go to Step 16
|
Go to Step 24
|
14 |
Does the buzzer work?
|
-
|
Go to Step 25
|
Go to Step 22
|
15 |
Does the buzzer work?
|
-
|
Go to Step 25
|
Go to Step 22
|
16 |
Repair the high resistance in the horn control circuit or horn ground circuit. Even a resistance as low as 0.5 ohms can cause a malfunction in the audio signal.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
17 |
Repair the open or high resistance in the battery positive voltage circuit at the horn relay coil.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
18 |
Important: The horn switch is part of the steering wheel airbag module. See Section 8B, Airbag System (SIR).
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
19 |
Repair the open or high resistance in the battery positive voltage circuit at the horn relay switch.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
20 |
Repair the open or high resistance in the horn control circuit.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
21 |
Repair the open or high resistance in the horn ground circuit.
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
22 |
Important: Perform the BCM programming procedure when replacing the BCM. Replace BCM. See Section 9V, "body controller".
Is the repair finished?
|
-
|
Go to Step 25
|
-
|
23 |
Replace horn relay.
Has the replacement been completed?
|
-
|
Go to Step 25
|
-
|
24 |
Replace horn.
Has the replacement been completed?
|
-
|
Go to Step 25
|
-
|
25 |
Give a sound signal.
Is the buzzer working properly?
|
-
|
-
|
Go to Step 1
|