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Hi Brian

My wife had the same problem with her Astra Coupe.

Has this been happening in the middle of the night or on hot days?

The problem as I understand it is that there is a battery in the alarm unit itself and it is charged by the cars main battery.

The alarm system itself senses voltage change as an intrusion and triggers the alarm. With time the battery deteriates in the alarm unit and struggles to hold its charge. The instability of the charge in the battery is exaggerated when it is cold at night or hot outside causing the alarm to trigger.

whole new alarm sounder unit needs replacing I think. As I recall it cost about £150 for the astra from a dealership.

S
 

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just had my alarm fault sorted today!!! hope it has worked.

fault was with 2 rear side windows in boot, vauxhall have bypassed the sensors so alarm wont keep going off!! £126. a new module would have cost hundreds!!!!
 

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nick said:
just had my alarm fault sorted today!!! hope it has worked.

fault was with 2 rear side windows in boot, vauxhall have bypassed the sensors so alarm wont keep going off!! £126. a new module would have cost hundreds!!!!












I have also had this pain in the backside... Bypassed cost me £190
by the stealer.....
 
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