Sound from an alarm does not necessarily prove that the road horn circuit is healthy, because a vehicle may use a separate sounder. Explain which sound was heard and how it was triggered rather than concluding that the horn itself has been tested.
Keep the functions separate
Record whether steering-wheel buttons or other column functions are also affected. Include recent wheel, airbag or column work. The workshop can then identify the actual circuits and determine whether the driver’s command reaches the relevant control system.
Do not open the steering wheel or bridge contacts as a quick test. Restraint-system components require the correct procedures. Arrange repair before relying on the vehicle’s warning equipment in normal traffic. A useful enquiry includes the vehicle details, the failed function and any related symptoms, rather than requesting a BCM solely because a different alarm sound still works. Ask for a circuit-based explanation of the proposed repair.
Related help
Browse all fault guides or use the vehicle module finder to prepare your enquiry. Include the vehicle, symptoms, complete fault codes and any previous test results. Assessment scope and compatibility must be confirmed before booking or sending a unit.