Since cutting the power is a possible indication of an intruder it triggers the brain to sound the alarm.
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Many modern car alarms are sophisticated components that tie into the vehicle s ecu main computer as well as the ignition system.
Use a code reader.
To power the alarm system the wiring is hooked up to a lead from the car battery.
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While cheap no name generic or off brand alarm systems may only provide a basic siren more complex systems like clifford offer multiple zoned proximity sensors motion sensors tilt angle sensors and an infrared wireless ignition immobilizer.
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On older vehicles the ownerâ s manual may provide a way to reset the key fob or alarm remote.
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This means the system is drawing battery power while the car is off and not charging the battery.
On newer vehicles the key fob or alarm remote may need to be reset with a code reader scanner.
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This hidden battery kicks in when somebody cuts off the main power source by clipping the battery cables for example.
Over time this sapping of energy can lead to battery failure.
The brain and alarm features may be wired to the car s main battery but they usually have a backup power source as well.
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Most procedures will vary from car to car but you can try removing and replacing the fob battery.