Hypothetical alarm problems

Hypothetically what would somebody(not me) have to do if the horn doesn't sound when the alarm goes off? The horn works by pushing the steering wheel buttons and the indicators flash when the alarm is going off. There's just no horn sound.



Also movement inside the car(not mine, it's a hypothetical question remember...) doesn't set the alarm off even though the sensor thing is above the armrest under the cover after a minute of the alarm being set. Not sure if these 2 issues could by related.

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