If there's no way to adjust the sensitivity of the microphone, I'd cover it with a piece of selotape. I'm guessing it would still be triggered by loud noises, such as breaking windows.
I guess it's no real loss if it wasn't triggered by sound as you still have the moment sensors - if someone steals something lying on your backseat, the alarm may or may not go off, but the thieves will still get what they want. If they try to steal the car, the movement sensors will be triggered anyway.
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Make and model of the alarm would be helpful. I've installed hundreds of car alarms and seen the frazzled people that result from mis-adjusted sensors.
Every alarm I ever installed, from high end Cliffords and Vipers to cheesy no-name brands, all sensors had adjustments somewhere. I know you say yours doesn't - if thats true, then you probably need to junk it anyway.
The end result, however, is that sensors and sirens really mostly end up being useless. If a thief busts out your window and grabs your *(name valuable item here)* do you really think that a siren and blinking tailights will make them put it back?
Most of the higher end cars we did, were mostly anti-theft (of the vehicle), anti-carjack, and extra remote-controlled features, like window and lock controls, remote engine start, and things like that. Sensors and such are 99% annoyance.
I am not sure, the company where i installed it says it's brand "lockar", but i dont know, in the booklet it says nothing about "lockar".
I guess is a no brand alarm.
in the booklet says sensor meter (which control only for hits and movements) NOT FOR THE MICROPHONE I wonder, I thought in covering that microphone with masking tape, but i would like to read suggestions.
instead of tape, which doesnt absorb much sound, i would try rolling a sock or some other cloth over the mic a few layers. eventually, you will get the mic to loose sensitivity.
As for a more presice solution, maybe a resistor in-line would work. seeing as i couldnt tell you what one to get, go with an adjustable potentiometer. I really dont know what size you would need, maybe start with a 10k, im sure that will have enough resistance to stop the mic, and you can adjust it down to almost no resistance....