Checking Alarm Horn

Checking alarm horn

Checking alarm horn function




- Ignition on.
Activate the alarm horn.
The horn should give a short sound tone.





Does the alarm horn function?

Yes - No Fault Found

No - Checking connectors

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Checking connectors








- Ignition off.
- Remedy control module, alarm relay and alarm horn connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check for damage etc.
- Reinstall components, reconnect connectors etc.
- Ignition on.
Activate the alarm horn.
The alarm horn should give a short sound tone.
If the alarm horn now functions the fault was caused by loose connections in the connectors.





Does the alarm horn function?

Yes - FAULT FOUND

No - Checking fuse, cables

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Checking fuse, cables




- Ignition off.
Check that fuse 6 is intact. If the fuse is blown, check the circuit after the fuse for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check the cable between control module #B18 and alarm horn relay terminal 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between alarm horn relay terminal 3 and alarm horn terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check cable between alarm horn terminal 2 and ground for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.





Was a fault detected?

Yes - Verification

No - Replacing component

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Replacing component
Try a new alarm horn according to Replacing the alarm horn Replacing the Alarm Horn.


Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied as follows:








- Ignition off.
- Reinstall connectors, components etc.
- Ignition on.
Activate the alarm horn.
The alarm horn should give a short sound tone.





Does the alarm horn function?

Yes - FAULT FOUND

No - No Fault Found Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking alarm horn function

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